Single-source automatic power control method and apparatus for frequency-diverse variable-gain stages of a CDMA cellular handset

• US 6,341,219 B1
• Filed: 02/05/1999
• Issued: 01/22/2002
• Est. Priority Date: 02/05/1999
• Status: Expired due to Term

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Agere Systems Guardian Corp. (Broadcom, Inc.)
• Inventors: Strobel, Christopher J., Poirier, John R.
• Primary Examiner(s): Urban, Edward F.
• Application Number:
  US09/244,858
• Time in Patent Office: 1,082 Days
• Field of Search: 455/127, 455/115, 455/116, 455/126, 455/91, 455/572, 375/297, 330/278, 330/279, 370/335, 370/342
• US Class Current: 455/116
• CPC Class Codes: H04W 52/36 with a discrete range or set of values, e.g. step size, ramping or offsets
• CPC Class Codes: H04W 52/52 using AGC [Automatic Gain Control] circuits or amplifiers

Abstract

An automatic and adjustable power control method and apparatus for optimally controlling the output power of a CDMA handset is provided. The method and apparatus utilize a single control signal to automatically control the gain of two frequency diverse variable gain stages of a transmitting portion of the handset by a multi-point hand-off technique. The multi-point hand-off technique partially varies the gain of a first stage to satisfy key system constraints and hands-off control to a second stage. The gain of the second stage is varied to satisfy additional system constraints. A second hand-off is performed so that the gain of the first stage may be varied again to maintain the optimal power control.

Claims

1. An automatic and adjustable output power control method for a telephone handset, said method comprising:

providing a control signal;

altering a gain of a first transmitting stage of the handset to satisfy at least one system parameter in response to a first variation of the control signal;

altering a gain of a second transmitting stage of the handset to satisfy at least one additional system parameter in response to a second variation of the control signal; and

varying the altered gain of the first transmitting stage in response to a third variation of the control signal,

wherein a total gain of a transmitting portion of the handset is equal to a summation of the gain of the first transmitting stage and the gain of the second transmitting stage, the gain of the first transmitting stage comprises a product of a voltage of the control signal and a gain slope of the first transmitting stage, the gain slope of the first transmitting stage comprising a division of a gain range of the first transmitting stage by a control voltage range of the first transmitting stage.

2. The method of claim 1 wherein a number of the at least one system parameter is two.

3. The method of claim 1 wherein the first transmitting stage is an intermediate frequency transmitting stage.

4. The method of claim 3 wherein the at least one system parameter comprises a system constraint.

5. The method of claim 4 wherein the system constraint comprises a requirement that the gain of the first transmitting stage is lowered prior to a lowering of the gain of the second transmitting stage.

6. The method of claim 4 wherein the system constraint comprises a requirement that a gain range of the first transmitting stage be extended.

7. The method of claim 1 wherein a number of the at least one additional system parameter is two.

8. The method of claim 1 wherein the second transmitting stage is a radio frequency transmitting stage.

9. The method of claim 8 wherein the at least one additional system parameter comprises an additional system constraint.

10. The method of claim 9 wherein the additional system constraint comprises a requirement that as the gain of the second transmitting stage is lowered a current consumption of the handset is lowered.

11. The method of claim 9 wherein the additional system constraint comprises a requirement that the gain of the second transmitting stage be lowered.

12. The method of claim 1 wherein the control signal is an analog voltage.

13. An automatic and adjustable output power control method for a telephone handset, said method comprising:

providing a control signal;

altering a gain of a first transmitting stage of the handset to satisfy at least one system parameter in response to a first variation of the control signal;

altering a gain of a second transmitting stage of the handset to satisfy at least one additional system parameter in response to a second variation of the control signal; and

varying the altered gain of the first transmitting stage in response to a third variation of the control signal,

wherein a total gain of a transmitting portion of the handset is equal to a summation of the gain of the first transmitting stage and the gain of the second transmitting stage and wherein the step of altering a gain of a first transmitting stage is performed by lowering the gain of the first transmitting stage from a first gain to a second gain, the first gain being a maximum gain and the second gain being an intermediate gain of the first transmitting stage, the intermediate gain corresponding to a level of the control signal.

14. The method of claim 13 wherein the step of altering a gain of a second transmitting stage of the handset to satisfy at least one system parameter is performed by lowering the gain of the second transmitting stage from a first gain to a second gain.

15. The method of claim 14 wherein the first gain is a maximum gain and the second gain is a minimum gain of the second transmitting stage.

16. The method of claim 15 wherein the minimum gain corresponds to a level of the control signal.

17. The method of claim 13 wherein the step of varying the altered gain of the first transmitting stage is performed by lowering the altered gain of the first transmitting stage from a first altered gain to a second altered gain.

18. The method of claim 17 wherein the first altered gain is an intermediate gain corresponding to a first level of the control signal and the second altered gain is a minimum gain of the first transmitting stage.

19. The method of claim 18 wherein the minimum gain corresponds to a second level of the control signal.

20. The method of claim 13 wherein the gain of the second transmitting stage comprises a product of a voltage of the control signal and a gain slope of the second transmitting stage.

21. The method of claim 20 wherein the gain slope of the second transmitting stage comprises a division of a gain range of the second transmitting stage by a control voltage range of the second transmitting stage.

22. An apparatus for providing automatic and adjustable output power control to a transmitting portion of a telephone handset comprising:

a controller coupled to the transmitting portion of the handset, said controller receiving a control signal from a second portion of the handset, said controller;

altering a gain of a first transmitting stage of the transmitting portion to satisfy at least one system parameter in response to a first variation of said control signal;

altering a gain of a second transmitting stage of the transmitting portion to satisfy at least one additional system parameter in response to a second variation of said control signal; and

varying said altered gain of the first transmitting stage in response to a third variation of said control signal,

wherein a total gain of the transmitting portion is equal to a summation of said gain of the first transmitting stage and said gain of the second transmitting stage, and said controller alters a gain of a second transmitting stage by lowering said gain of the second transmitting stage from a first gain to a second gain, said first gain being a maximum gain and said second gain being a minimum gain of the second transmitting stage, said minimum gain corresponding to a level of said control signal.

23. The apparatus of claim 22 wherein a number of said at least one system parameter is two.

24. The apparatus of claim 22 wherein the first transmitting stage is an intermediate frequency transmitting stage.

25. The apparatus of claim 24 wherein said at least one system parameter comprises a system constraint.

26. The apparatus of claim 25 wherein said system constraint comprises a requirement that said gain of the first transmitting stage is lowered prior to a lowering of said gain of the second transmitting stage.

27. The apparatus of claim 25 wherein said system constraint comprises a requirement that a gain range of the first transmitting stage be extended.

28. The apparatus of claim 22 wherein a number of said at least one additional system parameter is two.

29. The apparatus of claim 22 wherein the second transmitting stage is a radio frequency transmitting stage.

30. The apparatus of claim 29 wherein said at least one additional system parameter comprises an additional system constraint.

31. The apparatus of claim 30 wherein said additional system constraint comprises a requirement that as said gain of the second transmitting stage is lowered a current consumption of the transmitting portion is lowered.

32. The apparatus of claim 30 wherein said additional system constraint comprises a requirement that said gain of the second transmitting stage be lowered.

33. The apparatus of claim 22 wherein said control signal is an analog voltage.

34. An apparatus for providing automatic and adjustable output power control to a transmitting portion of a telephone handset comprising:

a controller coupled to the transmitting portion of the handset, said controller receiving a control signal from a second portion of the handset, said controller;

altering a gain of a first transmitting stage of the transmitting portion to satisfy at least one system parameter in response to a first variation of said control signal;

altering a gain of a second transmitting stage of the transmitting portion to satisfy at least one additional system parameter in response to a second variation of said control signal; and

varying said altered gain of the first transmitting stage in response to a third variation of said control signal,

wherein a total gain of the transmitting portion is equal to a summation of said gain of the first transmitting stage and said gain of the second transmitting stage and said controller alters a gain of a first transmitting stage by lowering said gain of the first transmitting stage from a first gain to a second gain, said first gain being a maximum gain and said second gain being an intermediate gain of the first transmitting stage, said intermediate gain corresponding to a level of said control signal.

35. The apparatus of claim 34 wherein said controller varies said altered gain of the first transmitting stage by lowering said altered gain from a first altered gain to a second altered gain.

36. The apparatus of claim 35 wherein said first altered gain is an intermediate gain corresponding to a first level of said control signal and said second altered gain is a minimum gain of the first transmitting stage.

37. The apparatus of claim 36 wherein said minimum gain corresponds to a second level of said control signal.

38. The apparatus of claim 34 wherein said gain of the first transmitting stage comprises a product of a voltage of the control signal and a gain slope of the first transmitting stage.

39. The apparatus of claim 38 wherein said gain slope of the first transmitting stage comprises a division of a gain range of the first transmitting stage by a control voltage range of the first transmitting stage.

40. The apparatus of claim 39 wherein said gain of the second transmitting stage comprises a product of a voltage of said control signal and a gain slope of the second transmitting stage.

41. The apparatus of claim 40 wherein said gain slope of the second transmitting stage comprises a division of a gain range of the second transmitting stage by a control voltage range of the second transmitting stage.

42. A telephone handset comprising:

a first controller providing a control signal;

a transmitting circuit, said transmitting circuit including first and second transmitting stages, said transmitting circuit having an output power; and

a power control circuit coupled to said transmitting circuit and said first controller, said power control circuit comprising;

a second controller coupled to said first and second transmitting stages receiving said control signal from said first controller, said second controller;

altering a gain of said first transmitting stage to satisfy at least one system parameter in response to a first variation of said control signal;

altering a gain of said second transmitting stage to satisfy at least one additional system parameter in response to a second variation of said control signal; and

varying said altered gain of said first transmitting stage in response to a third variation of said control signal,

wherein a total gain of said transmitting circuit is equal to a summation of said gain of said first transmitting stage and said gain of said second transmitting stage, said gain of said second transmitting stage comprises a product of a voltage of said control signal and a gain slope of said second transmitting stage, and said gain slope of said second transmitting stage comprises a division of a gain range of said second transmitting stage by a control voltage range of said second transmitting stage.

43. The handset of claim 42 wherein a number of said at least one system parameter is two.

44. The handset of claim 42 wherein said first transmitting stage is an intermediate frequency transmitting stage.

45. The handset of claim 44 wherein said at least one system parameter comprises a system constraint.

46. The handset of claim 45 wherein said system constraint comprises a requirement that said gain of said first transmitting stage is lowered prior to a lowering of said gain of said second transmitting stage.

47. The handset of claim 45 wherein said system constraint comprises a requirement that a gain range of said first transmitting stage be extended.

48. The handset of claim 42 wherein a number of said at least one additional system parameter is two.

49. The handset of claim 42 wherein said second transmitting stage is a radio frequency transmitting stage.

50. The handset of claim 49 wherein said at least one additional system parameter comprises an additional system constraint.

51. The handset of claim 50 wherein said additional system constraint comprises a requirement that as said gain of said second transmitting stage is lowered a current consumption of said transmitting circuit is lowered.

52. The handset of claim 50 wherein said additional system constraint comprises a requirement that said gain of said second transmitting stage be lowered.

53. The handset of claim 42 wherein said control signal is an analog voltage.

60. The handset of claim 51 wherein said minimum gain corresponds to a second level of said control signal.

54. A telephone handset comprising:

a first controller providing a control signal;

a transmitting circuit, said transmitting circuit including first and second transmitting stages, said transmitting circuit having an output power; and

a power control circuit coupled to said transmitting circuit and said first controller, said power control circuit comprising;

a second controller coupled to said first and second transmitting stages receiving said control signal from said first controller, said second controller;

altering a gain of said first transmitting stage to satisfy at least one system parameter in response to a first variation of said control signal;

altering a gain of said second transmitting stage to satisfy at least one additional system parameter in response to a second variation of said control signal; and

varying said altered gain of said first transmitting stage in response to a third variation of said control signal,

wherein a total gain of said transmitting circuit is equal to a summation of said gain of said first transmitting stage and said gain of said second transmitting stage, said second controller alters a gain of said second transmitting stage by lowering said gain of said second transmitting stage from a first gain to a second gain, said first gain being a maximum gain and said second gain being a minimum gain of said second transmitting stage, and wherein said minimum gain corresponds to a level of said control signal.

55. The handset of claim 54 wherein said second controller alters a gain of said first transmitting stage by lowering said gain of said first transmitting stage from a first gain to a second gain.

56. The handset of claim 55 wherein said first gain is a maximum gain and said second gain is an intermediate gain of said first transmitting stage.

57. The handset of claim 56 wherein said intermediate gain corresponds to a level of said control signal.

58. The handset of claim 54 wherein said second controller varies said altered gain of said first transmitting stage by lowering said altered gain from a first altered gain to a second altered gain.

59. The handset of claim 58 wherein said first altered gain is an intermediate gain corresponding to a first level of said control signal and said second altered gain is a minimum gain of said first transmitting stage.

61. The handset of claim 54 wherein said gain of said first transmitting stage comprises a product of a voltage of the control signal and a gain slope of said first transmitting stage.

62. The handset of claim 61 wherein said gain slope of said first transmitting stage comprises a division of a gain range of said first transmitting stage by a control voltage range of said first transmitting stage.