Magnetic sensing device for outputting a digital signal as a dynamic representation of an analog signal

• US 6,211,670 B1
• Filed: 12/17/1998
• Issued: 04/03/2001
• Est. Priority Date: 12/17/1998
• Status: Expired due to Fees

• Current Assignee: Optek Technology Incorporated (TT Electronics PLC)
• Original Assignee: Optek Technology Incorporated (TT Electronics PLC)
• Inventors: DeWilde, Eric, Rimlinger, Donald, Brown, Kenneth
• Primary Examiner(s): Strecker, Gerard R.
• Application Number:
  US09/213,715
• Time in Patent Office: 838 Days
• Field of Search: 324/160, 324/166, 324/173, 324/174, 324/207.12, 324/207.2-207.25, 324/251, 324/252, 327/14, 327/15, 327/28-30, 327/58, 327/60, 327/62, 327/68, 327/72, 327/510, 327/511, 123/406.58, 123/406.59
• US Class Current: 324/207.21
• CPC Class Codes: G01P 3/4802 by using electronic circuits in general
• CPC Class Codes: G01P 3/488 delivered by variable reluctance detectors
• CPC Class Codes: H03K 5/08 by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding H03K5/07 takes precedence; comparing one pulse with another H03K5/22; providing a determined threshold for switching H03K17/30

Abstract

A magnetic sensing device comprising a magnetic sensor and a digital circuit is disclosed. The magnetic sensor is operable to output an analog signal as an indication of any movement of an object. The digital circuit can include a dynamic reference threshold generator to output a reference signal in response to a detection of a signal feature of the analog signal and to a detection of a diametric signal feature of the analog signal, and an output format generator to output a digital signal in response to a comparison of the analog signal and the reference signal. The digital circuit can include a dynamic reference threshold generator to output a reference signal in response to a detection a first pair of quadrants of the analog signal and a detection of a second pair of quadrants of the analog signal, and an output format generator to output a digital signal in response to a comparison of the analog signal and the reference signal. The digital circuit can include a dynamic dual reference threshold generator to output a first reference signal as a percentage of a positive peak amplitude of the analog signal and second reference signal as a percentage of a negative peak amplitude of the analog signal, and an output format generator to output a digital signal in response to a comparison of the analog signal to the first reference signal and the second reference signal.

Claims

1. A magnetic sensing device comprising:

a magnetic sensor outputting a first analog signal; and

a digital circuit including;

an input signal conditioning circuit inputting said first analog signal, said input signal conditioning circuit outputting a second analog signal as a variant of said first analog signal;

a dynamic reference threshold generator inputting said second analog signal, said dynamic reference threshold generator outputting a reference signal,

wherein said reference signal equates a percentage of said second analog signal in response to a detection of a first signal feature of said second analog signal during a cycle of said second analog signal, and

wherein said reference signal equates a fixed percentage of one of a pair of peak amplitudes of said second analog signal in response to a detection of a second signal feature of said second analog signal during a cycle of said second analog signal,; and

an output format generator inputting said reference signal and said second analog signal, said output format generator outputting a digital signal, said digital signal equating a first logic signal level in response to said second analog signal being greater than said reference signal, said digital signal equating a second logic signal level in response to said second analog signal being less than said reference signal.

2. The magnetic sensing device of claim 1

wherein said magnetic sensor is a magneto-resistive sensor outputting said first analog signal as a first voltage analog signal, and

wherein said input signal conditioning circuit is an input amplifier outputting said second analog signal as a second voltage analog signal, said second voltage analog signal being an amplification of said first voltage analog signal.

3. The magnetic sensing device of claim 2 wherein said dynamic reference threshold generator includes:

a slope detector inputting said second voltage analog signal, said slope detector outputting a first voltage binary signal, said first voltage binary signal equating a first voltage level in response to a detection of a positive slope of said second voltage analog signal, said first voltage binary signal equating a second voltage level in response to a detection of a negative slope of said second voltage analog signal,

wherein said positive slope of said second voltage analog signal is said first signal feature of said second analog signal and said negative slope of said second voltage analog signal is said second signal feature of said second analog signal;

a switching circuit inputting said first voltage binary signal and said second voltage analog signal, said switching circuit outputting a third voltage analog signal in response to said first voltage binary signal equating said first voltage level, said third voltage analog signal equating at least a portion of said second voltage analog signal, said switching circuit being inoperative to output said third analog voltage signal in response to said first voltage binary signal equating said second voltage level;

a storage buffer inputting and storing said third voltage analog signal, said storage buffer outputting a fourth voltage analog signal, said fourth voltage analog signal equating at least a portion of said third voltage analog signal,

wherein said third voltage analog signal as stored by said storage buffer equates a fixed percentage of a positive peak voltage amplitude of said second voltage analog signal when said first voltage binary signal equates said second voltage level; and

an attenuator inputting said fourth voltage analog signal, said attenuator outputting said reference signal as a voltage reference signal, said voltage reference signal equating an attenuation of said fourth voltage analog signal.

4. The magnetic sensing device of claim 3 wherein said output format generator includes a comparator inputting said second voltage analog signal and said voltage reference signal, said comparator outputting said digital signal as a voltage digital signal, said voltage digital signal equating a first voltage logic level in response to said second voltage analog signal being greater than said voltage reference signal, said voltage digital signal equating a second voltage logic level in response to said second voltage analog signal being less than said voltage reference signal.

5. The magnetic sensing device of claim 3 wherein said output format generator includes:

a comparator inputting said second voltage analog signal and said voltage reference signal, said comparator outputting a second voltage binary signal, said second voltage binary signal equating a third voltage level in response to said second voltage analog signal being greater than said voltage reference signal, said second voltage binary signal equating a fourth voltage level in response to said second voltage analog signal being less than said voltage reference signal; and

an output buffer inputting said second voltage binary signal, said output buffer outputting said digital signal as a voltage digital signal, said voltage digital signal equating a first voltage logic level in response to said second voltage binary signal equating said third voltage level, said voltage digital signal equating a second voltage logic level in response to said second voltage binary signal equating said fourth voltage level.

6. The magnetic sensing device of claim 5 wherein said first voltage level and said third voltage level are substantially identical, and said second voltage level and said fourth voltage level are substantially identical.

35. The magnetic sensing device of claim 1 wherein said dynamic reference threshold generator includes:

a slope detector inputting said second analog signal, said slope detector outputting a binary signal, said binary signal equating a first signal level in response to a detection of a first slope of said second analog signal, said binary signal equating a second signal level in response to a detection of a second slope of said second analog signal; and

a switching circuit inputting said binary signal and said second analog signal, said switching circuit outputting a third analog signal in response to said binary signal equating said first signal level, said third analog signal equating at least a portion of said second analog signal, said switching circuit being inoperable to output said third analog signal when said binary signal equates said second signal level.

36. The magnetic sensing device of claim 35 wherein said first slope of said second analog signal corresponds to said first signal feature and said second slope of said second analog signal corresponds to said second signal feature.

37. The magnetic sensing device of claim 35 wherein said dynamic reference threshold generator further includes a storage buffer inputting and storing said third analog signal, said storage buffer outputting a fourth analog signal, said fourth analog signal equating at least a portion of said third analog signal, said third analog signal as stored by said storage buffer equating a fixed percentage of one of a pair of peak amplitudes of said second analog signal when said binary signal equates said second signal level.

38. The magnetic sensing device of claim 37 wherein said dynamic reference threshold generator further includes an attenuator inputting said fourth analog signal, said attenuator outputting a reference signal, said reference signal equating an attenuation of said fourth analog signal.

39. The magnetic sensing device of claim 1 wherein said output format generator includes:

a comparator inputting said second analog signal and said reference signal, said comparator outputting a binary signal, said binary signal equating a first signal level in response to said second analog signal being greater than said reference signal, said binary signal equating a second signal level in response to said second analog signal being less than said reference signal; and

an output buffer inputting said binary signal, said output buffer outputting said digital signal, said digital signal equating a first logic signal level in response to said binary signal equating said first signal level, said digital signal equating a second logic signal level in response to said binary signal equating said second signal level.

7. A magnetic sensing device comprising:

a magnetic sensor outputting a first analog signal; and

a digital circuit including;

a dynamic reference threshold generator inputting said first analog signal, said dynamic reference threshold generator outputting a reference signal,

wherein said reference signal equates a percentage of said first analog signal in response to a detection of a first signal feature of said first analog signal during a cycle of said first analog signal, and

wherein said reference signal equates a fixed percentage of one of a pair of peak amplitudes of said first analog signal in response to a detection of a second signal feature of said first analog signal during a cycle of said first analog signal, ; and

an output format generator inputting said reference signal and said first analog signal, said output format generator outputting a digital signal, said digital signal equating a first logic signal level in response to said first analog signal being greater than said reference signal, said digital signal equating a second logic signal level in response to said first analog signal being less than said reference signal.

8. The magnetic sensing device of claim 7 wherein said magnetic sensor is a magneto-resistive sensor outputting said first analog signal as a first voltage analog signal.

9. The magnetic sensing device of claim 8 wherein said dynamic reference threshold generator includes:

a slope detector inputting said first voltage analog signal, said slope detector outputting a first voltage binary signal, said first voltage binary signal equating a first voltage level in response to a detection of a positive slope of said first voltage analog signal, said first voltage binary signal equating a second voltage level in response to a detection of a negative slope of said first voltage analog signal.

wherein said positive slope of said first voltage analog signal is said first signal feature of said first analog signal and said negative slope of said first voltage analog signal is said second signal feature of said first analog signal;

a switching circuit inputting said first voltage binary signal and said first voltage analog signal, said switching circuit outputting a second voltage analog signal in response to said first voltage binary signal equating said first voltage level, said second voltage analog signal equating at least a portion of said first voltage analog signal, said switching circuit being inoperative to output said second voltage analog signal in response to said first voltage binary signal equating said second voltage level;

a storage buffer inputting and storing said second voltage analog signal, said storage buffer outputting a third voltage analog signal, said third voltage analog signal equating at least a portion of said second voltage analog signal,

wherein said second voltage analog signal as stored by said storage buffer equates a fixed percentage of a positive peak voltage amplitude of said first voltage analog signal when said first voltage binary signal equates said second voltage level; and

an attenuator inputting said third voltage analog signal, said attenuator outputting said reference signal as a voltage reference signal, said voltage reference signal equating an attenuation of said third voltage analog signal.

10. The magnetic sensing device of claim 9 wherein said output format generator includes a comparator inputting said first voltage analog signal and said voltage reference signal, said comparator outputting said digital signal as a voltage digital signal, said voltage digital signal equating a first voltage logic level in response to said first voltage analog signal being greater than said voltage reference signal, said voltage digital signal equating a second voltage logic level in response to said first voltage analog signal being less than said voltage reference signal.

11. The magnetic sensing device of claim 9 wherein said output format generator includes:

a comparator inputting said first voltage analog signal and said voltage reference signal, said comparator outputting a second voltage binary signal, said second voltage binary signal equating a third voltage level in response to said first voltage analog signal being greater than said voltage reference signal, said second voltage binary signal equating a fourth voltage level in response to said first voltage analog signal being less than said voltage reference signal; and

an output buffer inputting said second voltage binary signal, said output buffer outputting said digital signal as a voltage digital signal, said voltage digital signal equating a first voltage logic level in response to said second voltage binary signal equating said third voltage level, said voltage digital signal equating a second voltage logic level in response to said second voltage binary signal equating said fourth voltage level.

12. The magnetic sensing device of claim 11 wherein said first voltage level and said third voltage level are substantially identical, and said second voltage level and said fourth voltage level are substantially identical.

40. The magnetic sensing device of claim 7 wherein said dynamic reference threshold generator includes:

a slope detector inputting said first analog signal, said slope detector outputting a binary signal, said binary signal equating a first signal level in response to a detection of a first slope of said first analog signal, said binary signal equating a second signal level in response to a detection of a second slope of said first analog signal; and

a switching circuit inputting said binary signal and said first analog signal, said switching circuit outputting a second analog signal in response to said binary signal equating said first signal level, said second analog signal equating at least a portion of said first analog signal, said switching circuit being inoperable to output said second analog signal when said binary signal equates said second signal level.

41. The magnetic sensing device of claim 40 wherein said first slope of said first analog signal corresponds to said first signal feature and said second slope of said first analog signal corresponds to said second signal feature.

42. The magnetic sensing device of claim 40 wherein said dynamic reference threshold generator further includes a storage buffer inputting and storing said second analog signal, said storage buffer outputting a third analog signal, said third analog signal equating at least a portion of said second analog signal, said second analog signal as stored by said storage buffer equating a fixed percentage of one of a pair of peak amplitudes of said first analog signal when said binary signal equates said second signal level.

43. The magnetic sensing device of claim 42 wherein said dynamic reference threshold generator further includes an attenuator inputting said third analog signal, said attenuator outputting a reference signal, said reference signal equating an attenuation of said third analog signal.

44. The magnetic sensing device of claim 7 wherein said output format generator includes:

a comparator inputting said first analog signal and said reference signal, said comparator outputting a binary signal, said binary signal equating a first signal level in response to said first analog signal being greater than said reference signal, said binary signal equating a second signal level in response to said first analog signal being less than said reference signal; and

an output buffer inputting said binary signal, said output buffer outputting said digital signal, said digital signal equating a first logic signal level in response to said binary signal equating said first signal level, said digital signal equating a second logic signal level in response to said binary signal equating said second signal level.

13. A magnetic sensing device comprising:

a magnetic sensor outputting a first analog signal; and

a digital circuit including;

an input signal conditioning circuit inputting said first analog signal, said input signal conditioning circuit outputting a second analog signal as a variant of said first analog signal;

a dynamic reference threshold generator inputting said second analog signal, said dynamic reference threshold generator outputting a reference signal,

wherein said reference signal equates a percentage of said second analog signal in response to a detection of a first quadrant or a second quadrant of said second analog signal during a cycle of said second analog signal, and

wherein said reference signal equates a percentage of one of a pair of peak amplitudes of said second analog signal in response to a detection of a third quadrant or a fourth quadrant of said second analog signal during a cycle of said second analog signal; and

an output format generator inputting said reference signal and said second analog signal, said output format generator outputting a digital signal, said digital signal equating a first logic signal level in response to said second analog signal being greater than said reference signal, said digital signal equating a second logic signal level in response to said second analog signal being less than said reference signal.

14. The magnetic sensing device of claim 13

wherein said magnetic sensor is a magneto-resistive sensor outputting said first analog signal as a first voltage analog signal, and

wherein said input signal conditioning is an input amplifier outputting said second analog signal as a second voltage analog signal, said second voltage analog signal being an amplification of said first voltage analog signal.

15. The magnetic sensing device of claim 14 wherein said dynamic reference threshold generator includes:

a slope detector inputting said second voltage analog signal, said slope detector outputting a first voltage binary signal, said first voltage binary signal equating a first voltage level in response to a detection of a positive slope of said second voltage analog signal, said first voltage binary signal equating a second voltage level in response to a detection of a negative slope of said second voltage analog signal;

a polarity detector inputting said second voltage analog signal, said polarity detector outputting a second voltage binary signal, said second voltage binary signal equating said first voltage level in response to a detection of a positive polarity of said second voltage analog signal, said second voltage binary signal equating said second voltage level in response to a detection of a negative polarity of said second voltage analog signal,

wherein said positive slope and said positive polarity of said second voltage analog signal collectively correspond to said first quadrant, said negative slope and said negative polarity of said second voltage analog signal collectively correspond to said second quadrant, said negative slope and said positive polarity of said second voltage analog signal collectively correspond to said third quadrant, and said positive slope and said negative polarity of said second voltage analog signal collectively correspond to said fourth quadrant;

a logic circuit inputting said first voltage binary signal and said second voltage binary signal, said logic circuit outputting a third voltage binary signal, said third voltage binary signal equating said first voltage level in response to said first voltage binary signal equating said second voltage binary signal, said third voltage binary signal equating said second voltage level in response to said first voltage binary signal differing from said second voltage binary signal;

a switching circuit inputting said third voltage binary signal and said second voltage analog signal, said switching circuit outputting a third voltage analog signal in response to said third voltage binary signal equating said first voltage level, said third voltage analog signal equating at least a portion of said second voltage analog signal in response to said third voltage binary signal equating said first voltage level, said switching circuit being inoperable to output said third voltage analog signal in response to said third voltage binary signal equating said second voltage level;

a storage buffer inputting and storing said third voltage analog signal, said storage buffer outputting a fourth voltage analog signal, said fourth voltage analog signal equating at least a portion of said third voltage analog signal,

wherein said third voltage analog signal as stored by said storage buffer equates a fixed percentage of a positive peak voltage amplitude of said second voltage analog signal when said first voltage binary signal equates second voltage level and said second voltage binary signal equates said first voltage level, and

wherein said third voltage analog signal as stored by said storage buffer equates a fixed percentage of a negative peak voltage amplitude of said second voltage analog signal when said first voltage binary signal equates first voltage level and said second voltage binary signal equates said second voltage level; and

an attenuator inputting said fourth voltage analog signal, said attenuator outputting said reference signal as a voltage reference signal, said voltage reference signal equating an attenuation of said fourth voltage analog signal.

16. The magnetic sensing device of claim 15 wherein said output format generator includes a comparator inputting said second voltage analog signal and said voltage reference signal, said comparator outputting said digital signal as a voltage digital signal, said voltage digital signal equating a first voltage logic level in response to said second voltage analog signal being greater than said voltage reference signal, said voltage digital signal equating a second voltage logic level in response to said second voltage analog signal being less than said voltage reference signal.

17. The magnetic sensing device of claim 15 wherein said output format generator includes:

a comparator inputting said second voltage analog signal and said voltage reference signal, said comparator outputting a fourth voltage binary signal, said fourth voltage binary signal equating a third voltage level in response to said second voltage analog signal being greater than said voltage reference signal, said fourth voltage binary signal equating a fourth voltage level in response to said second voltage analog signal being less than said voltage reference signal; and

an output buffer inputting said fourth voltage binary signal, said output buffer outputting said digital signal as a voltage digital signal, said voltage digital signal equating a first voltage logic level in response to said fourth voltage binary signal equating said third voltage level, said voltage digital signal equating a second voltage logic level in response to said fourth voltage binary signal equating said fourth voltage level.

45. The magnetic sensing device of claim 13 wherein said dynamic reference threshold generator includes:

a slope detector inputting said second analog signal, said slope detector outputting a first binary signal, said first binary signal equating a first signal level in response to a detection of a first slope of said second analog signal, said first binary signal equating a second signal level in response to a detection of a second slope of said second analog signal; and

a polarity detector inputting said second analog signal, said polarity detector outputting a second binary signal, said second binary signal equating said first signal level in response to a detection of a first polarity of said second analog signal, said second binary signal equating said second signal level in response to a detection of a second polarity of said second analog signal.

46. The magnetic sensing device of claim 45 wherein said first slope and said first polarity of said second analog signal collectively correspond to said first quadrant, said second slope and said second polarity of said second analog signal collectively correspond to said second quadrant, said second slope and said first polarity collectively correspond to said third quadrant, and said first slope and said second polarity collectively correspond to said fourth quadrant.

47. The magnetic sensing device of claim 45 wherein said dynamic reference threshold generator further includes a logic circuit inputting said first binary signal and said second binary signal, said logic circuit outputting a third binary signal, said third binary signal equating said first signal level in response to said first binary signal equating said second binary signal, said third binary signal equating said second binary signal in response to said first binary signal differing from said second binary signal.

48. The magnetic sensing device of claim 47 wherein said dynamic reference threshold generator further includes a switching circuit inputting said third binary signal and said second analog signal, said switching circuit outputting a third analog signal in response to said third binary signal equating said first signal level, said third analog signal equating at least a portion of said second analog signal, said switching circuit being inoperable to output said third analog signal when said third binary signal equates said second signal level.

49. The magnetic sensing device of claim 48 wherein said dynamic reference threshold generator further includes a storage buffer inputting and storing said third analog signal, said storage buffer outputting a fourth analog signal equating at least a portion of said third analog signal, said third analog signal as stored by said storage buffer equating a fixed percentage of a first peak amplitude of said second analog signal when said first binary signal equates said second signal level and said second binary signal equates said first signal level, said third analog signal as stored by said storage buffer equating a fixed percentage of a second peak amplitude of said second analog signal when said first binary signal equates said first signal level and said second binary signal equates said second signal level.

50. The magnetic sensing device of claim 49 wherein said dynamic reference threshold generator further includes an attenuator inputting said fourth analog signal, said attenuator outputting said reference signal, said reference signal equating an attenuation of said fourth analog signal.

51. The magnetic sensing device of claim 13 wherein said output format generator includes:

a comparator inputting said second analog signal and said reference signal, said comparator outputting a binary signal, said binary level equating a first signal level in response to said second analog signal being greater than said reference signal, said binary signal equating a second signal level in response to said second analog signal less than said reference signal; and

an output buffer inputting said binary signal, said output buffer outputting said digital signal, said digital signal equating a first logic signal level in response to said binary signal equating said first signal level, said digital signal equating a second logic signal level in response to said binary signal equating said second signal level.

18. The magnetic sensing device of claims wherein said first voltage level and said third voltage level are substantially identical, and said second voltage level and said fourth voltage level are substantially identical.

19. A magnetic sensing device comprising:

a magnetic sensor outputting a first analog signal; and

a digital circuit including;

a dynamic reference threshold generator inputting said first analog signal, said dynamic reference threshold generator outputting a reference signal,

wherein said reference signal equates a percentage of said first analog signal in response to a detection of a first quadrant or a second quadrant of said first analog signal during a cycle of said first analog signal, and

wherein said reference signal equates a percentage of one of a pair of peak amplitudes of said first analog signal in response to a detection of a third quadrant or a fourth quadrant of said first analog signal during a cycle of said first analog signal; and

an output format generator inputting said reference signal and said first analog signal, said output format generator outputting a digital signal, said digital signal equating a first logic signal level in response to said first analog signal being greater than said reference signal, said digital signal equating a second logic signal level in response to said first analog signal being less than said reference signal.

20. The magnetic sensing device of claim 19 wherein said magnetic sensor is a magneto-resistive sensor outputting said first analog signal as a first voltage analog signal.

21. The magnetic sensing device of claim 20 wherein said dynamic reference threshold generator includes:

a slope detector inputting said first voltage analog signal, said slope detector outputting a first voltage binary signal, said first voltage binary signal equating a first voltage level in response to a detection of a positive slope of said first voltage analog signal, said first voltage binary signal equating a second voltage level in response to a detection of a negative slope of said first voltage analog signal;

a polarity detector inputting said first voltage analog signal, said polarity detector outputting a second voltage binary signal, said second voltage binary signal equating said first voltage level in response to a detection of a positive polarity of said first voltage analog signal, said second voltage binary signal equating said second voltage level in response to a detection of a negative polarity of said first voltage analog signal,

wherein said positive slope and said positive polarity of said first voltage analog signal collectively correspond to said first quadrant, said negative slope and said negative polarity of said first voltage analog signal collectively correspond to said second quadrant, said negative slope and said positive polarity of said first voltage analog signal collectively correspond to said third quadrant, and said positive slope and said negative polarity of said first voltage analog signal collectively correspond to said fourth quadrant;

a logic circuit inputting said first voltage binary signal and said second voltage binary signal, said logic circuit outputting a third voltage binary signal, said third voltage binary signal equating said first voltage level in response to said first voltage binary signal equating said second voltage binary signal, said third voltage binary signal equating said second voltage level in response to said first voltage binary signal differing from said second voltage binary signal;

a switching circuit inputting said third voltage binary signal and said first voltage analog signal, said switching circuit outputting a second voltage analog signal in response to said third voltage binary signal equating said first voltage level, said second voltage analog signal equating at least a portion of said first voltage analog signal, said switching circuit being inoperable to output said second voltage analog signal in response to said third voltage binary signal equating said second voltage level;

a storage buffer inputting and storing said second voltage analog signal, said storage buffer outputting a third voltage analog signal equating at least a portion of said second voltage analog signal,

wherein said second voltage analog signal as stored by said storage buffer equates a fixed percentage of a positive peak voltage amplitude of said second voltage analog signal when said first voltage binary signal equates second voltage level and said second voltage binary signal equates said first voltage level, and

wherein said second voltage analog signal as stored by said storage buffer equates a fixed percentage of a negative peak voltage amplitude of said second voltage analog signal when said first voltage binary signal equates first voltage level and said second voltage binary signal equates said second voltage level; and

an attenuator inputting said third voltage analog signal, said attenuator outputting said reference signal as a voltage reference signal, said voltage reference signal equating an attenuation of said third voltage analog signal.

22. The magnetic sensing device of claim 21 wherein said output format generator includes a comparator inputting said first voltage analog signal and said voltage reference signal, said comparator outputting said digital signal as a voltage digital signal, said voltage digital signal equating a first voltage logic level in response to said first voltage analog signal being greater than said voltage reference signal, said voltage digital signal equating a second voltage logic level in response to said first voltage analog signal being less than said voltage reference signal.

23. The magnetic sensing device of claim 21 wherein said output format generator includes:

a comparator inputting said first voltage analog signal and said voltage reference signal, said comparator outputting a fourth voltage binary signal, said fourth voltage binary signal equating a third voltage level in response to said first voltage analog signal being greater than said voltage reference signal, said fourth voltage binary signal equating a fourth voltage level in response to said first voltage analog signal being less than said voltage reference signal; and

an output buffer inputting said fourth voltage binary signal, said output buffer outputting said digital signal as a voltage digital signal, said voltage digital signal equating a first voltage logic level in response to said fourth voltage binary signal equating said third voltage level, said voltage digital signal equating a second voltage logic level in response to said fourth voltage binary signal equating said fourth voltage level.

24. The magnetic sensing device of claim 23 wherein said first voltage level and said third voltage level are substantial identical, and said second voltage level and said fourth voltage level are substantially identical.

52. The magnetic sensing device of claim 19 wherein said dynamic reference threshold generator includes:

a slope detector inputting said first analog signal, said slope detector outputting a first binary signal, said first binary signal equating a first signal level in response to a detection of a first slope of said first analog signal, said first binary signal equating a second signal level in response to a detection of a second slope of said first analog signal; and

a polarity detector inputting said first analog signal, said polarity detector outputting a second binary signal, said second binary signal equating said first signal level in response to a detection of a first polarity of said first analog signal, said second binary signal equating said second signal level in response to a detection of a second polarity of said first analog signal.

53. The magnetic sensing device of claim 52 wherein said first slope and said first polarity of said first analog signal collectively correspond to said first quadrant, said second slope and said second polarity of said second analog signal collectively correspond to said second quadrant, said second slope and said first polarity collectively correspond to said third quadrant, and said first slope and said second polarity collectively correspond to said fourth quadrant.

54. The magnetic sensing device of claim 52 wherein said dynamic reference threshold generator further includes a logic circuit inputting said first binary signal and said second binary signal, said logic circuit outputting a third binary signal, said third binary signal equating said first signal level in response to said first binary signal equating said second binary signal, said third binary signal equating said second binary signal in response to said first binary signal differing from said second binary signal.

55. The magnetic sensing device of claim 54 wherein said dynamic reference threshold generator further includes a switching circuit inputting said third binary signal and said first analog signal, said switching circuit outputting a second analog signal in response to said third binary signal equating said first signal level, said second analog signal equating at least a portion of said first analog signal, said switching circuit being inoperable to output said second analog signal when said third binary signal equates said second signal level.

56. The magnetic sensing device of claim 55 wherein said dynamic reference threshold generator further includes a storage buffer inputting and storing said second analog signal, said storage buffer outputting a third analog signal equating at least a portion of said second analog signal, said second analog signal as stored by said storage buffer equating a fixed percentage of a first peak amplitude of said first analog signal when said first binary signal equates said second signal level and said second binary signal equates said first signal level, said second analog signal as stored by said storage buffer equating a fixed percentage of a second peak amplitude of said first analog signal when said first binary signal equates said first signal level and said second binary signal equates said second signal level.

57. The magnetic sensing device of claim 56 wherein said dynamic reference threshold generator further includes an attenuator inputting said third analog signal, said attenuator outputting said reference signal, said reference signal equating an attenuation of said third analog signal.

58. The magnetic sensing device of claim 19 wherein said output format generator includes:

a comparator inputting said first analog signal and said reference signal, said comparator outputting a binary signal, said binary level equating a first signal level in response to said first analog signal being greater than said reference signal, said binary signal equating a second signal level in response to said first analog signal less than said reference signal; and

an output buffer inputting said binary signal, said output buffer outputting said digital signal, said digital signal equating a first logic level in response to said binary signal equating said first signal level, said digital signal equating a second logic level in response to said binary signal equating said second signal level.

25. A magnetic sensing device comprising:

a magnetic sensor outputting a first analog signal; and

a digital circuit including;

an input signal conditioning circuit inputting said first analog signal, said input signal conditioning circuit outputting a second analog signal, said second analog signal being a variant of said first analog signal;

a dynamic dual reference threshold generator inputting said second analog signal, said dynamic dual reference threshold generator simultaneously outputting a first reference signal and a second reference signal,

wherein said first reference signal equates a percentage of a positive peak amplitude of said second analog signal during a cycle of said second analog signal, and

wherein said second reference signal equates a percentage of a negative peak amplitude of said second analog signal during a cycle of said second analog signal; and

an output format generator concurrently inputting said first reference signal, said second reference signal, and said second analog signal, said output format generator outputting a digital signal, said digital signal equating a first logic signal level in response to said second analog signal being greater than said first reference signal, said digital signal equating a second logic signal level in response to said second analog signal being less than said second reference signal.

26. The magnetic sensing device of claim 25

wherein said magnetic sensor is a magneto-resistive sensor outputting said first analog signal as a first voltage analog signal, and

wherein said input signal conditioning circuit is an input amplifier outputting said second analog signal as a second voltage analog signal, said second voltage analog signal being an amplification of said first voltage analog signal.

27. The magnetic sensing device of claim 26 wherein said dynamic dual reference threshold generator includes:

a dual peak detector inputting said second voltage analog signal, said dual peak detector outputting a first voltage positive peak signal and a first voltage negative peak signal, said first voltage positive peak signal equating a percentage of a positive peak amplitude of said second voltage analog signal, said first voltage negative peak signal equating a percentage of a negative peak amplitude of said second voltage analog signal;

a dual storage buffer inputting and storing said first voltage positive peak signal and said first voltage negative peak signal, said dual storage buffer outputting a second voltage positive peak signal and a second voltage negative peak signal, said second voltage positive peak signal equating at least a portion of said first voltage positive peak signal as stored by said dual storage buffer, said second voltage negative peak signal equating at least a portion of said first voltage negative peak signal as stored by said dual storage buffer; and

a dual attenuator inputting second voltage positive peak signal and said second voltage negative peak signal, said dual attenuator simultaneously outputting said first reference signal as a first voltage reference signal and said second reference signal as a second voltage reference signal, said first voltage reference signal equating an attenuation of said second voltage positive peak signal, said second voltage reference signal equating an attenuation of said second voltage negative peak signal.

28. The magnetic sensing device of claim 27 wherein said output format generator includes a dual comparator concurrently inputting said second voltage analog signal, said first voltage reference signal, and said second voltage reference signal, said comparator outputting said digital signal as a voltage digital signal, said voltage digital signal equating a first voltage logic level in response to said second voltage analog signal being greater than said first voltage reference signal, said voltage digital signal equating a second voltage logic level in response to said second voltage analog signal being less than said second voltage reference signal.

29. The magnetic sensing device of claim 27 wherein said output format generator includes:

a dual comparator concurrently inputting said second voltage analog signal, said first voltage reference signal, and said second voltage reference signal, said dual comparator outputting a voltage binary signal, said voltage binary signal equating a first voltage level in response to said second voltage analog signal being greater than said first voltage reference signal, said voltage binary signal equating a second voltage level in response to said second voltage analog signal being less than said second voltage reference signal; and

an output buffer inputting said voltage binary signal, said output buffer outputting said digital signal as a voltage digital signal, said voltage digital signal equating a first voltage logic level in response to said voltage binary signal equating said first voltage level, said voltage digital signal equating a second voltage logic level in response to said voltage binary signal equating said second voltage level.

59. The magnetic sensing device of claim 25 wherein said dynamic dual reference threshold generator includes a dual peak detector inputting said second analog signal, said dual peak detector outputting a first positive peak signal and a second negative peak signal, said first positive peak signal equating a percentage of a positive peak amplitude of said second analog signal, said second negative peak signal equating a percentage of a negative peak amplitude of said second analog signal.

60. The magnetic sensing device of claim 59 wherein said dynamic dual reference threshold generator further includes a dual storage buffer inputting and storing said first positive peak signal and said first negative peak signal, said dual storage buffer outputting a second positive peak signal and a second negative peak signal, said second positive peak signal equating at least a portion of said first positive peak signal as stored by said dual storage buffer, said second negative peak signal equating at least a portion of said first negative peak signal as stored by said dual storage buffer.

61. The magnetic sensing device of claim 60 wherein said dynamic dual reference threshold generator further includes a dual attenuator inputting second positive peak signal and said second negative peak signal, said dual attenuator simultaneously outputting said first reference signal and said second reference signal, said first reference signal equating an attenuation of said second positive peak signal, said second reference signal equating an attenuation of said second negative peak signal.

62. The magnetic sensing device of claim 25 wherein said output format generator includes:

a dual comparator concurrently inputting said second analog signal, said first reference signal, and said second reference signal, said comparator outputting a binary signal, said binary signal equating a first signal level in response to said second analog signal being greater than said first reference signal, said binary signal equating a second signal level in response to said first analog signal being less than said second reference signal; and

an output buffer inputting said binary signal, said output buffer outputting said digital signal, said digital signal equating a first logic level in response to said binary signal equating said first signal level, said digital signal equating a second logic level in response to said binary signal equating said second signal level.

30. A magnetic sensing device comprising:

a magnetic sensor outputting a analog signal; and

a digital circuit including;

a dynamic dual reference threshold generator inputting said analog signal, said dynamic duel reference threshold generator simultaneously outputting a first reference signal and a second reference signal,

wherein said first reference signal equates a percentage of a positive peak amplitude of said first analog signal during a cycle of said first analog signal, and

wherein said second reference signal equates a percentage of a negative peak amplitude of said first analog signal during a cycle of said first analog signal; and

an output format generator concurrently inputting said first reference signal, said second reference signal, and said analog signal, said output format generator outputting a digital signal, said digital signal equating a first logic signal level in response to said analog signal being greater than said first reference signal, said digital signal equating a second logic signal level in response to said analog signal being less than said second reference signal.

31. The magnetic sensing device of claim 30 wherein said magnetic sensor is a magneto-resistive sensor outputting said analog signal as a voltage analog signal.

32. The magnetic sensing device of claim 31 wherein said dynamic dual reference threshold generator includes:

a dual peak detector inputting said voltage analog signal, said dual peak detector outputting a first voltage positive peak signal and a first voltage negative peak signal, said first voltage positive peak signal equating a percentage of a positive peak amplitude of said first voltage analog signal, said first voltage negative peak signal equating a percentage of a negative peak amplitude of said first voltage analog signal;

a dual storage buffer inputting and storing said first voltage positive peak signal and said first voltage negative peak signal, said dual storage buffer outputting a second voltage positive peak signal and a second voltage negative peak signal, said second voltage positive peak signal equating at least a portion of said first voltage positive peak signal as stored by said dual storage buffer, said second voltage negative peak signal equating at least a portion of said first voltage negative peak signal as stored by said dual storage buffer; and

a dual attenuator inputting second voltage positive peak signal and said second voltage negative peak signal, said dual attenuator simultaneously outputting said first reference signal as a first voltage reference signal and said second reference signal as a second voltage reference signal, said first voltage reference signal equating an attenuation of said second voltage positive peak signal, said second voltage reference signal equating an attenuation of said second voltage negative peak signal.

33. The magnetic sensing device of claim 32 wherein said output format generator includes a dual comparator concurrently inputting said voltage analog signal, said first voltage reference signal, and said second voltage reference signal, said dual comparator outputting said digital signal as a voltage digital signal, said voltage digital signal equating a first voltage logic level in response to said voltage analog signal being greater than said first voltage reference signal, said voltage digital signal equating a second voltage logic level in response to said voltage analog signal being less than said second voltage reference signal.

34. The magnetic sensing device of claim 32 wherein said output format generator includes:

a dual comparator concurrently inputting said voltage analog signal, said first voltage reference signal, and said second voltage reference signal, said dual comparator outputting a voltage binary signal, said voltage binary signal equating a first voltage level in response to said voltage analog signal being greater than said first voltage reference signal, said voltage binary signal equating a second voltage level in response to said voltage analog signal being less than said second voltage reference signal; and

an output buffer inputting said voltage binary signal, said output buffer outputting said digital signal as a voltage digital signal, said voltage digital signal equating a first voltage logic level in response to said voltage binary signal equating said first voltage level, said voltage digital signal equating a second voltage logic level in response to said voltage binary signal equating said second voltage level.

63. The magnetic sensing device of claim 30 wherein said dynamic dual reference threshold generator includes a dual peak detector inputting said analog signal, said dual peak detector outputting a first positive peak signal and a second negative peak signal, said first positive peak signal equating a percentage of a positive peak amplitude of said analog signal, said second negative peak signal equating a percentage of a negative peak amplitude of said analog signal.

64. The magnetic sensing device of claim 63 wherein said dynamic dual reference threshold generator further includes a dual storage buffer inputting and storing said first positive peak signal and said first negative peak signal, said dual storage buffer outputting a second positive peak signal and a second negative peak signal, said second positive peak signal equating at least a portion of said first positive peak signal as stored by said dual storage buffer, said second negative peak signal equating at least a portion of said first negative peak signal as stored by said dual storage buffer.

65. The magnetic sensing device of claim 64 wherein said dynamic dual reference threshold generator further includes a dual attenuator inputting second positive peak signal and said second negative peak signal, said dual attenuator simultaneously outputting said first reference signal and said second reference signal, said first reference signal equating an attenuation of said second positive peak signal, said second reference signal equating an attenuation of said second negative peak signal.

66. The magnetic sensing device of claim 30 wherein said output format generator includes:

a dual comparator concurrently inputting said analog signal, said first reference signal, and said second reference signal, said comparator outputting a binary signal, said binary signal equating a first signal level in response to said analog signal being greater than said first reference signal, said binary signal equating a second signal level in response to said first analog signal being less than said second reference signal; and

an output buffer inputting said binary signal, said output buffer outputting said digital signal, said digital signal equating a first logic level in response to said binary signal equating said first signal level, said digital signal equating a second logic level in response to said binary signal equating said second signal level.