Envelope modulator saturation detection using a DC-DC converter

1. A method of providing efficient signal modulation comprising:

providing a polar signal to a switching module, the switching module having a voltage input;

providing a feedback signal from the switching module, the feed back signal representative of a duty cycle; and

adjusting a peak of a modulation signal based on the feedback signal.

2. The method of claim 1 , wherein adjusting the peak of the modulation signal comprises modifying the polar signal.

3. The method of claim 1 , further comprising generating the polar signal from an input signal.

4. The method of claim 1 , further comprising amplifying the polar signal, wherein the amplification is based on the voltage input.

5. The method of claim 1 , further comprising modifying a phase of the polar signal.

6. The method of claim 1 , further comprising, from the polar signal, generating an RF signal for transmission.

7. The method of claim 1 , wherein the voltage input indicates a low battery condition.

8. The method of claim 1 , wherein the feedback signal indicates when the voltage input comprises a low signal.

9. The method of claim 1 , wherein a magnitude of the polar signal is modified based on the feedback signal.

10. The method of claim 1 , wherein the feedback signal provides for efficient modulation of the polar signal.

11. The method of claim 1 , wherein the modulation comprises amplitude modulation.

12. The method of claim 1 , wherein the modulation comprises phase modulation.

13. The method of claim 1 , further comprising receiving a polar signal.

14. The method of claim 1 , further comprising generating a polar signal.

15. A system for providing efficient polar signal modulation comprising:

a controller for receiving an input and outputting a polar signal;

a voltage converter coupled to the controller, the voltage converter for:

receiving a magnitude component of the polar signal,

receiving a voltage input, and

providing a power signal;

a phase modulator coupled to the controller, the phase modulator for:

receiving a phase angle θ,

receiving a phase modulation ω c , and

providing a phase modulated signal; and

an amplifier coupled to the voltage converter and the phase modulator, the amplifier for amplifying the phase modulated signal based on the power signal,

wherein the voltage converter provides a feedback signal to the controller, and

further wherein the controller adjusts a peak of a modulation signal based on the feedback signal, such that the output power and the amplification by the amplifier are based on the feedback signal.

16. The system of claim 15 , wherein adjusting the peak of the modulation signal comprises modifying the polar signal.

17. The system of claim 15 , wherein the controller generates the polar signal.

18. The system of claim 15 , wherein the power output is based on the voltage input such that the amplification is based on the voltage input.

19. The system of claim 15 , wherein the phase modulated signal is based on the phase angle θ and the phase modulation ω c .

20. The system of claim 15 , wherein the system generates an RF signal for transmission.

21. The system of claim 15 , wherein the voltage signal indicates a low battery condition.

22. The system of claim 15 , wherein the feedback signal indicates when the voltage input is low.

23. The system of claim 15 , wherein a magnitude of the polar signal is modified based on the feedback signal.

24. The system of claim 15 , wherein the feedback signal provides for efficient modulation of the polar signal.

25. The system of claim 15 , wherein the modulation comprises amplitude modulation.

26. The system of claim 15 , wherein the modulation comprises phase modulation.

27. A system for providing efficient signal modulation comprising:

a control module for receiving a first signal and outputting a second signal, the second signal based on the first signal;

a power source for outputting a power level;

a switching module coupled to the control module for receiving the second signal and coupled to the power source for receiving the power level, wherein the switching module provides a feedback signal based on the power level; and

a modulation scale, wherein the modulation scale is adjusted based on the feedback signal.

28. The system of claim 27 , wherein the modulation scale comprises a system parameter for modulation of the second signal.

29. The system of claim 27 , wherein the second signal comprises polar coordinates.

30. The system of claim 27 , wherein the second signal is digital.

31. The system of claim 27 , wherein the first signal comprises quadrature components.

32. The system of claim 27 , wherein the first signal comprises an analog signal.

33. The system of claim 27 , wherein the switching module has a duty cycle based on the power level, wherein the feedback signal is based on the duty cycle.

34. The system of claim 27 , wherein the switching module is driven by pulse width modulation.

35. The system of claim 27 , wherein the switching module is driven by sigma-delta modulation.

36. The system of claim 27 , wherein the power source is limited, the power source providing power for the system.

37. A system for providing efficient polar signal modulation comprising:

a controller for receiving an input and outputting a polar signal;

a voltage converter coupled to the controller, the voltage converter for:

receiving a magnitude component of the polar signal,

receiving a voltage input, and

providing a power signal;

a quadrature modulator coupled to the controller, the quadrature modulator for:

receiving an in-phase signal I,

receiving a quadrature signal Q, and

providing a modulated signal; and

an amplifier coupled to the voltage converter and the quadrature modulator, the amplifier for amplifying the modulated signal,

wherein the voltage converter provides a feedback signal to the controller, and

further wherein the controller adjusts a peak of a modulation signal based on the feedback signal, such that the output power and the amplification by the amplifier are based on the feedback signal.

38. The system of claim 37 , wherein adjusting the peak of the modulation signal comprises modifying the modulation signal.

39. The system of claim 37 , wherein the controller generates the in-phase signal I and the quadrature signal Q.

40. The system of claim 37 , wherein power dissipation is based on the voltage input.

41. The system of claim 37 , wherein the system generates an RF signal for transmission.

42. The system of claim 37 , wherein the voltage signal indicates a low battery condition.

43. The system of claim 37 , wherein the feedback signal indicates when the voltage input is low.

44. The system of claim 37 , wherein a magnitude of the modulation signal is modified based on the feedback signal.

45. The system of claim 37 , wherein the feedback signal provides for efficient modulation of the modulation signal.

46. The system of claim 37 , wherein the modulation comprises amplitude modulation.

47. An apparatus comprising:

a DC-DC converter; and

a controller configured to provide a magnitude component signal for the DC-DC converter;

wherein the DC-DC converter is configured to receive a voltage signal, and provides a voltage output for power amplification,

wherein the DC-DC converter provides a feedback based on the voltage signal and the voltage output, and

wherein the controller modifies the magnitude component signal based on the feedback.