System and method for modifying output power of an information communication system

• US 7,167,045 B1
• Filed: 06/07/2004
• Issued: 01/23/2007
• Est. Priority Date: 06/07/2004
• Status: Active Grant

• Current Assignee: Marvell Asia Pte Limited (Marvell Technology Group Limited)
• Original Assignee: Marvell International Limited (Marvell Technology Group Limited)
• Inventors: Tse, Lawrence, Tsai, King Chun, Son, Sang Won, Chao, Yuan-Ju
• Primary Examiner(s): Shingleton; Michael B
• Application Number:
  US10/861,481
• Time in Patent Office: 960 Days
• Field of Search: 330/278, 330/279, 330/285, 330/254, 330/289, 330/256, 330/266, 330/272, 330/133, 330/130, 327/306
• US Class Current: 330/130
• CPC Class Codes: H03G 3/3042 in modulators, frequency-changers, transmitters or power amplifiers transmission power control in bidirectional transmission systems H04W52/04

Abstract

A system for communicating information includes a variable gain amplifier (VGA) responsive to an input signal and a gain control signal for controlling a gain of the VGA. The system also includes a power amplifier responsive to the VGA. An output power level of the power amplifier is compared to a predetermined reference value to generate the gain control signal. The gain control signal is offset by a gain offset value. To change the output power level of the power amplifier from a first output power level to a second output power level, a first predetermined reference value and a first gain offset value associated with the first output power level are changed substantially concurrently to a second predetermined reference value and a second gain offset value, respectively, associated with the second output power level.

Claims

1. A system formed on a monolithic substrate, comprising:

a variable gain amplifier (VGA) responsive to an input signal and a gain control signal for controlling a gain of the VGA;

a power amplifier responsive to the VGA;

a power detector responsive to the power amplifier,

wherein the power detector detects an output power level of the power amplifier;

a comparator responsive to the power detector,

wherein the comparator compares the output power level of the power amplifier with a first predetermined value to generate the gain control signal;

an accumulator responsive to the comparator,

wherein an output of the accumulator is offset by a first gain offset value, and

wherein the first predetermined value and the first gain offset value are associated with a first output power level of the power amplifier;

a temperature sensor,

wherein the gain control signal is further offset by a temperature offset value associated with a temperature of the integrated circuit sensed by the temperature sensor,

wherein the temperature offset value alters the gain control signal to compensate the gain of the VGA for variations in the temperature of the integrated circuit; and

conversion circuitry responsive to the temperature sensor,

wherein the conversion circuitry converts the temperature sensed by the temperature sensor into the temperature offset value, and

wherein to change the output power level of the power amplifier from the first output power level to a second output power level, the first predetermined reference value and the first gain offset value are changed substantially simultaneously to a second predetermined reference value and a second gain offset value, respectively, associated with the second output power level.

2. The system of claim 1, wherein the system is compliant with a standard selected from the group consisting of I.E.E.E. 802.11, 802.11a, 802.11b, 802.11g, 802.11h, 802.11i and 802.11n.

3. A system formed on a monolithic substrate, comprising:

means for amplifying an input signal;

means for amplifying power responsive to the input signal amplifying means;

means for detecting an output power level of the power amplifying means;

means for comparing the output power level of the power amplifying means with a first predetermined value to generate a gain control signal for controlling a gain of the input signal amplifying means;

means for accumulating responsive to the comparing means,

wherein an output of the means for accumulating is offset by a first gain offset value, and

wherein the first predetermined value and the first gain offset value are associated with a first output power level of the power amplifying means;

means for sensing a temperature of the integrated circuit,

wherein the gain control signal is further offset by a temperature offset value associated with the temperature of the integrated circuit,

wherein the temperature offset value alters the gain control signal to compensate the gain of the input signal amplifying means for variations in the temperature of the integrated circuit; and

means for converting the temperature sensed by the temperature sensing means into the temperature offset value,

wherein to change the output power level of the power amplifying means from the first output power level to a second output power level, the first predetermined reference value and the first gain offset value are changed substantially simultaneously to a second predetermined reference value and a second gain offset value, respectively, associated with the second output power level.

4. The system of claim 3, wherein the system is compliant with a standard selected from the group consisting of I.E.E.E. 802.11, 802.11a, 802.11b, 802.11g, 802.11h, 802.11i and 802.11n.

5. A system, comprising:

a variable gain amplifier (VGA) responsive to an input signal and a gain control signal for controlling a gain of the VGA;

a power amplifier responsive to the VGA,

wherein an output power level of the power amplifier is compared to a predetermined reference value to generate the gain control signal,

wherein the gain control signal is offset by a gain offset value, and

wherein to change the output power level of the power amplifier from a first output power level to a second output power level, a first predetermined reference value and a first gain offset value associated with the first output power level are changed substantially concurrently to a second predetermined reference value and a second gain offset value, respectively, associated with the second output power level, wherein at least the second predetermined reference value is a stored value that is selected based on the second output power level; and

a memory,

wherein the memory stores a plurality of predetermined reference values and a plurality of gain offset values,

wherein each of a respective predetermined reference value and gain offset value are associated with a different output power level of the power amplifier.

8. The system of claim 5, further comprising:

a comparator responsive to the power amplifier and the predetermined reference value,

wherein the comparator compares the output power level of the power amplifier with the predetermined reference value.

9. The system of claim 8, further comprising:

an accumulator responsive to the comparator,

wherein the gain offset value offsets an output of the accumulator.

10. The system of claim 9, wherein the output of the accumulator is incremented by a predetermined value when an output of the comparator is positive, and

wherein the output of the accumulator is decremented by the predetermined value when the output of the comparator is negative.

11. The system of claim 5, further comprising:

a power detector responsive to the power amplifier,

wherein the power detector detects the output power level of the power amplifier.

12. The system of claim 5, wherein the system is formed on a monolithic substrate.

13. The system of claim 5, wherein the system is compliant with a standard selected from the group consisting of I.E.E.E. 802.11, 802.11a, 802.11b, 802.11g, 802.11h, 802.11i and 802.11n.

14. An integrated circuit, comprising:

the system of claim 5.

6. A system, comprising:

a variable gain amplifier (VGA) responsive to an input signal and a gain control signal for controlling a gain of the VGA;

a power amplifier responsive to the VGA,

wherein an output power level of the power amplifier is compared to a predetermined reference value to generate the gain control signal,

wherein the gain control signal is offset by a gain offset value, and

wherein to change the output power level of the power amplifier from a first output power level to a second output power level, a first predetermined reference value and a first gain offset value associated with the first output power level are changed substantially concurrently to a second predetermined reference value and a second gain offset value, respectively, associated with the second output power level, wherein at least the second predetermined reference value is a stored value that is selected based on the second output power level; and

a temperature sensor,

wherein the temperature sensor senses a temperature of the system,

wherein the gain control signal is further offset by a temperature offset value associated with the temperature sensed by the temperature sensor, and

wherein the temperature offset value modifies the gain control signal to compensate the gain of the VGA for variations in the temperature of the system.

7. The system of claim 6, further comprising:

conversion circuitry responsive to the temperature sensor,

wherein the conversion circuitry converts the temperature sensed by the temperature sensor into the temperature offset value.

15. A system, comprising:

a variable gain amplifier (VGA) responsive to an input signal and a gain control signal for controlling a gain of the VGA;

a power amplifier responsive to the VGA,

wherein an output power level of the power amplifier is compared to a predetermined reference value to generate the gain control signal,

wherein the gain control signal is offset by a gain offset value; and

a temperature sensor,

wherein the temperature sensor senses a temperature of the system,

wherein the gain control signal is further offset by a temperature offset value associated with the temperature sensed by the temperature sensor,

wherein the temperature offset value alters the gain control signal to compensate the gain of the VGA for variations in the temperature of the system, and

wherein to change the output power level of the power amplifier from a first output power level to a second output power level, a first predetermined reference value and a first gain offset value associated with the first output power level are changed substantially concurrently to a second predetermined reference value and a second gain offset value, respectively, associated with the second output power level.

16. The system of claim 15, further comprising:

conversion circuitry responsive to the temperature sensor,

wherein the conversion circuitry converts the temperature sensed by the temperature sensor into the temperature offset value.

17. The system of claim 15, further comprising:

a comparator responsive to the power amplifier and the predetermined reference value,

wherein the comparator compares the output power level of the power amplifier with the predetermined reference value.

18. The system of claim 17, further comprising:

an accumulator responsive to the comparator,

wherein the gain offset value offsets an output of the accumulator.

19. The system of claim 18, wherein the output of the accumulator is incremented by a predetermined value when an output of the comparator is positive, and

wherein the output of the accumulator is decremented by the predetermined value when the output of the comparator is negative.

20. The system of claim 15, further comprising:

a power detector responsive to the power amplifier,

wherein the power detector detects the output power level of the power amplifier.

21. The system of claim 15, further comprising:

a memory,

wherein the memory stores a plurality of predetermined reference values and a plurality of gain offset values,

wherein each of a respective predetermined reference value and gain offset value are associated with a different output power level of the power amplifier.

22. The system of claim 15, wherein the system is formed on a monolithic substrate.

23. The system of claim 15, wherein the system is compliant with a standard selected from the group consisting of I.E.E.E. 802.11, 802.11a, 802.11b, 802.11g, 802.11h, 802.11i and 802.11n.

24. An integrated circuit, comprising:

the system of claim 15.

25. A system, comprising:

means for amplifying an input signal;

means for amplifying power responsive to the input signal amplifying means;

means for controlling a gain of the input signal amplifying means,

wherein the input signal amplifying means is responsive to the gain controlling means,

wherein an output power level of the power amplifying means is compared to a predetermined reference value by the gain controlling means to generate a gain control signal,

wherein the gain control signal is offset by a gain offset value, and

wherein to change the output power level of the power amplifying means from a first output power level to a second output power level, a first predetermined reference value and a first gain offset value associated with the first output power level are changed substantially concurrently to a second predetermined reference value and a second gain offset value, respectively, associated with the second output power level, wherein at least the second predetermined reference value is a stored value that is selected based on the second output power level; and

memory means for storing information,

wherein the memory means stores a plurality of predetermined reference values and a plurality of gain offset values,

wherein each of a respective predetermined reference value and gain offset value are associated with a different output power level of the power amplifying means.

28. The system of claim 25, wherein the gain controlling means comprises:

means for comparing the output power level of the power amplifying means with the predetermined reference value.

29. The system of claim 28, wherein the gain controlling means comprises:

means for accumulating responsive to the comparing means,

wherein the gain offset value offsets an output of the accumulating means.

30. The system of claim 29, wherein the output of the accumulating means is incremented by a predetermined value when an output of the comparing means is positive, and

wherein the output of the accumulating means is decremented by the predetermined value when the output of the comparing means is negative.

31. The system of claim 25, wherein the gain controlling means comprises:

means for detecting the output power level of the power amplifying means.

32. The system of claim 25, wherein the system is formed on a monolithic substrate.

33. The system of claim 25, wherein the system is compliant with a standard selected from the group consisting of I.E.E.E. 802.11, 802.11a, 802.11b, 802.11g, 802.11h, 802.11i and 802.11n.

34. An integrated circuit, comprising:

the system of claim 25.

26. A system, comprising:

means for amplifying an input signal;

means for amplifying power responsive to the input signal amplifying means; and

means for controlling a gain of the input signal amplifying means,

wherein the input signal amplifying means is responsive to the gain controlling means,

wherein an output power level of the power amplifying means is compared to a predetermined reference value by the gain controlling means to generate a gain control signal,

wherein the gain control signal is offset by a gain offset value, and

wherein to chance the output power level of the power amplifying means from a first output power level to a second output power level, a first predetermined reference value and a first gain offset value associated with the first output power level are changed substantially concurrently to a second predetermined reference value and a second gain offset value, respectively, associated with the second output power level, wherein at least the second predetermined reference value is a stored value that is selected based on the second output power level, wherein the gain controlling means comprises;

means for sensing a temperature of the system,

wherein the gain control signal is further offset by a temperature offset value associated with the temperature sensed by the temperature sensing means, and

wherein the temperature offset value modifies the gain control signal to compensate the gain of the input signal amplifying means for variations in the temperature of the system.

27. The system of claim 26, wherein the gain controlling means comprises:

means for converting the temperature sensed by the temperature sensing means into the temperature offset value.

35. A system, comprising:

means for amplifying a signal;

means for amplifying power responsive to the signal amplifying means;

means for controlling a gain of the signal amplifying means,

wherein the signal amplifying means is responsive to the gain controlling means,

wherein an output power level of the power amplifying means is compared to a predetermined reference value by the gain controlling means to generate a gain control signal, and

wherein the gain control signal is offset by a gain offset value; and

means for sensing a temperature of the system,

wherein the gain control signal is further offset by a temperature offset value associated with the temperature sensed by the temperature sensing means,

wherein the temperature offset value alters the gain control signal to compensate the gain of the signal amplifying means for variations in the temperature of the system, and

wherein to change the output power level of the power amplifying means from a first output power level to a second output power level, a first predetermined reference value and a first gain offset value associated with the first output power level are changed substantially concurrently to a second predetermined reference value and a second gain offset value, respectively, associated with the second output power level.

36. The system of claim 35, wherein the gain controlling means comprises:

means for converting the temperature sensed by the temperature sensing means into the temperature offset value.

37. The system of claim 35, wherein the gain controlling means comprises:

means for comparing the output power level of the power amplifying means with the predetermined reference value.

38. The system of claim 37, wherein the gain controlling means comprises:

means for accumulating responsive to the comparing means,

wherein the gain offset value offsets an output of the accumulating means.

39. The system of claim 38, wherein the output of the accumulating means is incremented by a predetermined value when an output of the comparing means is positive, and

wherein the output of the accumulating means is decremented by the predetermined value when the output of the comparing means is negative.

40. The system of claim 35, further comprising:

means for detecting the output power level of the power amplifying means.

41. The system of claim 35, further comprising:

means for storing a plurality of predetermined reference values and a plurality of gain offset values,

wherein each of a respective predetermined reference value and gain offset value are associated with a different output power level of the power amplifying means.

42. The system of claim 35, wherein the system is formed on a monolithic substrate.

43. The system of claim 35, wherein the system is compliant with a standard selected from the group consisting of I.E.E.E. 802.11, 802.11a, 802.11b, 802.11g, 802.11h, 802.11i and 802.11n.

44. An integrated circuit, comprising:

the system of claim 35.

45. A method for modifying output power, comprising the steps of:

a.) amplifying an input signal;

b.) amplifying power of an output of step (a); and

c.) controlling a gain of step (a),

wherein step (a) is responsive to step (c), and

wherein step (c) comprises the steps of;

c1.) comparing an output power level of step (b) to a predetermined reference value to generate a gain control signal, and

c2.) offsetting the gain control signal by a gain offset value;

d.) changing the output power level of step (b) from a first output power level to a second output power level,

wherein a first predetermined reference value and a first gain offset value associated with the first output power level are changed substantially concurrently to a second predetermined reference value and a second gain offset value, respectively, associated with the second output power level, wherein at least the second predetermined reference value is a stored value that is selected based on the second output power level; and

e.) storing a plurality of predetermined reference values and a plurality of gain offset values in a memory,

wherein each of a respective predetermined reference value and gain offset value are associated with a different output power level of step (b).

48. The method of claim 45, wherein step (c) further comprises the step of:

c3.) accumulating the output of step (c1),

wherein the gain offset value offsets an output of step (c3).

49. The method of claim 48, wherein the output of step (c3) is incremented by a predetermined value when the output of step (c1) is positive, and

wherein the output of step (c3) is decremented by the predetermined value when the output of step (c1) is negative.

50. The method of claim 45, wherein step (c) further comprises the step of:

c3.) detecting the output power level of the step (b).

51. The method of claim 45, wherein the method is compliant with a standard selected from the group consisting of I.E.E.E. 802.11, 802.11a, 802.11b, 802.11g, 802.11h, 802.11i and 802.11n.

46. A method for modifying output power, comprising the steps of:

a.) amplifying an input signal;

b.) amplifying power of an output of step (a); and

c.) controlling a gain of step (a).

wherein step (a) is responsive to step (c), and

wherein step (c) comprises the steps of;

c1.) comparing an output power level of step (b) to a predetermined reference value to generate a gain control signal, and

c2.) offsetting the gain control signal by a gain offset value; and

d.) changing the output power level of step (b) from a first output power level to a second output power level,

wherein a first predetermined reference value and a first gain offset value associated with the first output power level are changed substantially concurrently to a second predetermined reference value and a second gain offset value, respectively, associated with the second output power level, wherein at least the second predetermined reference value is a stored value that is selected based on the second output power level, wherein step (c) further comprises the steps of;

c3.) sensing a temperature; and

c4.) offsetting the gain control signal by a temperature offset value associated with the temperature sensed by step (c3),

wherein the temperature offset value modifies the gain control signal to compensate the gain of step (a) for variations in the temperature.

47. The method of claim 46, wherein step (c) further comprises the step of:

c5.) converting the temperature sensed by step (c3) into the temperature offset value.

52. A method for modifying output power, comprising the steps of:

a.) amplifying a signal;

b.) amplifying power output by step (a);

c.) controlling a gain of step (a),

wherein step (a) is responsive to step (c),

wherein an output power level of step (b) is compared to a predetermined reference value by step (c) to generate a gain control signal, and

wherein the gain control signal is offset by a gain offset value;

d.) sensing a temperature,

wherein the gain control signal is further offset by a temperature offset value associated with the temperature sensed by step (d),

wherein the temperature offset value alters the gain control signal to compensate the gain of step (a) for variations in the temperature; and

e.) changing the output power level of the step (b) from a first output power level to a second output power level,

wherein a first predetermined reference value and a first gain offset value associated with the first output power level are changed substantially concurrently to a second predetermined reference value and a second gain offset value, respectively, associated with the second output power level.

53. The method of claim 52, further comprising the step of:

f.) converting the temperature sensed by step (d) into the temperature offset value.

54. The method of claim 52, wherein step (c) comprises the step of:

c1.) comparing the output power level of step (b) with the predetermined reference value.

55. The method of claim 54, wherein step (c) comprises the step of:

c2.) accumulating the output of step (c1),

wherein the gain offset value offsets an output of step (c2).

56. The method of claim 55, wherein the output of step (c2) is incremented by a predetermined value when the output of step (c1) is positive, and

wherein the output of step (c2) is decremented by the predetermined value when the output of step (c1) is negative.

57. The method of claim 52, wherein step (c) comprises the step of:

c1.) detecting the output power level of step (b).

58. The method of claim 52, further comprising the step of:

f.) storing a plurality of predetermined reference values and a plurality of gain offset values,

wherein each of a respective predetermined reference value and gain offset value are associated with a different output power level of step (b).

59. The method of claim 52, wherein the method is compliant with a standard selected from the group consisting of I.E.E.E. 802.11, 802.11a, 802.11b, 802.11g, 802.11h, 802.11i and 802.11n.