Processing

Please wait...

Settings

Settings

Goto Application

1. WO2002019545 - SYSTEM FOR CLOSED LOOP POWER CONTROL USING A LINEAR OR A NON-LINEAR POWER AMPLIFIER

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

What is claimed is:

1. A method for controlling output power from an amplifier using a closed power control feedback loop, comprising the steps of:
supplying a first modulated signal to a power amplifier;
detecting a portion of an output of the power amplifier using a power detector in a closed power control feedback loop;
adjusting the output power of the power amplifier based upon the detected portion of the output of the power amplifier and a reference signal; and
injecting a second modulated signal into the feedback loop using a variable gain element.

2. The method of claim 1, wherein the second modulated signal is an inverse of a desired second modulated signal.

3. The method of claim 1, wherein the variable gain element is an amplifier.

4. The method of claim 1, wherein the variable gain element is an attenuator.

's.
5. The method of claim 1, wherein the first modulated signal is a phase modulated signal.

6. The method of claim 1, wherein the second modulated signal is an amplitude modulated signal.

7. The method of claim 1 , wherein the variable gain element operates on a radio frequency (RF) signal.

'• 8. The method of claim 1, wherein the variable gain element operates on a baseband signal representing the radio frequency (RF) power level of the output power

3 of the power amplifier.

1 9. A method for controlling output power from an amplifier using a

2 closed power control feedback loop, comprising the steps of:
3 supplying a combined modulated signal to a power amplifier, the combined . modulated signal including a first portion and a second portion;
5 detecting a portion of an output of the power amplifier using a power detector in a closed power control feedback loop;
7 adjusting the output power of the power amplifier based upon the difference

8 between the detected portion of the output of the power amplifier and a reference

9 signal; and
0 injecting a second modulated signal into the feedback loop using a variable 1 gain element, the second modulated signal being an inverse of the second portion of 2 the combined modulated signal.

1 10. The method of claim 9, wherein the variable gain element is an amplifier.

1 11. The method of claim 9, wherein the variable gain element is an attenuator.

1 12. The method of claim 9, wherein the first portion of the combined

2 modulated signal is phase modulated.

1 13. The method of claim 9, wherein the second portion of the combined

2 modulated signal is amplitude modulated.

14. The method of claim 9, wherein the variable gain element operates on a radio frequency (RF) signal.

15. The method of claim 9, wherein the variable gain element operates on a baseband signal representing the radio frequency (RF) power level of the output power of the power amplifier.

16. A system for controlling output power from an amplifier using a closed power control feedback loop, comprising:
a power amplifier configured to receive a first modulated signal;
a power detector located in a closed power, control feedback loop and configured to detect a portion of an output of the power amplifier;
a comparator configured to develop an error signal used to adjust the output power of the power amplifier based upon the difference between the detected portion of the output of the power amplifier and a reference signal; and
a variable gain amplifier configured to inject a second modulated signal into the feedback loop.

17. The system of claim 16, wherein the second modulated signal is an inverse of a desired second modulated signal.

18. The system of claim 16, wherein the variable gain element is an amplifier.

19. The system of claim 16, wherein the variable gain element is an attenuator.

20. The system of claim 16, wherein the first modulated signal is a phase modulated signal.

21. The system of claim 16, wherein the second modulated signal is an amplitude modulated signal.

22. The system of claim 16, wherein the variable gain element operates on a radio frequency (RF) signal.

23. The system of claim 16, wherein the variable gain element operates on a baseband signal representing the radio frequency (RF) power level of the output power of the power amplifier.

24. A system for controlling output power from an amplifier using a closed power control feedback loop, comprising:
a power amplifier configured to receive a combined modulated signal, the combined modulated signal including a first portion and a second portion;
a power detector located in a closed power control feedback loop and configured to detect a portion of an output of the power amplifier;
a comparator configured to develop an error signal used to adjust the output power of the power amplifier based upon the difference between the detected portion of the output of the power amplifier and a reference signal; and
a variable gain element configured to inject a second modulated signal into the feedback loop, the second modulated signal being an inverse of the second portion of the combined modulated signal.

25. The system of claim 24, wherein the variable gain element is an amplifier.

26. The system of claim 24, wherein the variable gain element is an attenuator.

27. The system of claim 24, wherein the first portion of the combined modulated signal is phase modulated.

28. The system of claim 24, wherein the second portion of the combined modulated signal is amplitude modulated.

29. The system of claim 24, wherein the variable gain element operates on a radio frequency (RF) signal.

30. The system of claim 24, wherein the variable gain element operates on a baseband signal representing the radio frequency (RF) power level of the output power of the power amplifier.

31. A computer readable medium having a program for controlling output power from an amplifier using a closed power control feedback loop, the program comprising logic configured to perform the steps of:
supplying a first modulated signal to a power amplifier;
detecting a portion of an output of the power amplifier using a power detector in a closed power control feedback loop;
adjusting the output power of the power amplifier based upon the detected portion of the output of the power amplifier and a reference signal; and
injecting a second modulated signal into the feedback loop using a variable gain element.

32. The program of claim 31, wherein the second modulated signal is an inverse of a desired second modulated signal.

33. The program of claim 31, wherein the variable gain element is an amplifier.

34. . The program of claim 31, wherein the variable gain element is an attenuator.

35. The program of claim 31 , herein the first modulated signal is a phase modulated signal.

36. The program of claim 31, wherein the second modulated signal is an amplitude modulated signal.

37. The program of claim 31, wherein the variable gain element operates on a radio frequency (RF) signal.

38. The program of claim 31 , wherein the variable gain element operates on a baseband signal representing the radio frequency (RF) power level of the output power of the power amplifier.

39. A computer readable medium having a program for controlling output power from an amplifier using a closed power control feedback loop, the program comprising logic configured to perform the steps of:
supplying a combined modulated signal to a power amplifier, the combined modulated signal including a first portion arid a second portion;
detecting a portion of an output of the power amplifier using a power detector in a closed power control feedback loop;
adjusting the output power of the power amplifier based upon the difference between the detected portion of the output of the power amplifier and a reference signal; and
injecting a second modulated signal into the feedback loop using a variable gain element, the second modulated signal being an inverse of the second portion of the combined modulated signal.

40. The program of claim 39, wherein the variable gain element is an amplifier.

41. The program of claim 39, wherein the variable gain element is an attenuator.

42. The program of claim 39, wherein the first portion of the combined modulated signal is phase modulated.

43. The program of claim 39, wherein the second portion of the combined modulated signal is amplitude modulated.

44. The program of claim 39, wherein the variable gain element operates on a radio frequency (RF) signal.

45. The program of claim 39, wherein the variable gain element operates on a baseband signal representing the radio frequency (RF) power level of the output power of the power amplifier.

46. _ A system for controlling output power from an amplifier using a closed power control feedback loop, comprising:
means for supplying a first modulated signal to a power amplifier;
means for detecting a portion of an output of the power amplifier using a power detector in a closed power control feedback loop;
means for adjusting the output power of the power amplifier based upon the detected portion of the output of the power amplifier and a reference signal; and
means for injecting a second modulated signal into the feedback loop using a variable gain element.

47. A system for controlling output power from an amplifier using a closed power control feedback loop, comprising:
means for receiving a first modulated signal in a power amplifier;
means for detecting a portion of an output of the power amplifier;
means for developing an error signal used to adjust the output power of the power amplifier based upon the difference between the detected portion of the output of the power amplifier and a reference signal; and
means for injecting a second modulated signal into the feedback loop.