RF power transmission, modulation, and amplification embodiments, including control circuitry for controlling power amplifier output stages

• US 8,233,858 B2
• Filed: 12/12/2006
• Issued: 07/31/2012
• Est. Priority Date: 10/22/2004
• Status: Expired due to Fees

• Current Assignee: ParkerVision, Inc.
• Original Assignee: ParkerVision, Inc.
• Inventors: Sorrells, David F., Rawlins, Michael W., Rawlins, Gregory S.
• Primary Examiner(s): Le, Lana N
• Application Number:
  US11/636,970
• Publication Number:
  US 20070096806A1
• Time in Patent Office: 2,058 Days
• Field of Search: 4551271-1276, 455/91, 455/102, 455/110, 455/108, 455/126, 455/114.3, 330/10, 330/295, 330/296, 330/297, 330/96, 330/2, 330/132, 330/136, 330/124.R
• US Class Current: 455/127.1
• CPC Class Codes: H03F 1/02 Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
• CPC Class Codes: H03F 1/0205 in transistor amplifiers
• CPC Class Codes: H03F 1/0211 with control of the supply voltage or current
• CPC Class Codes: H03F 1/0261 with control of the polarisation voltage or current, e.g. gliding Class A
• CPC Class Codes: H03F 1/0294 using vector summing of two or more constant amplitude phase-modulated signals
• CPC Class Codes: H03F 1/32 Modifications of amplifiers to reduce non-linear distortion by negative feedback H03F1/34
• CPC Class Codes: H03F 2200/102 A non-specified detector of a signal envelope being used in an amplifying circuit
• CPC Class Codes: H03F 2201/3206 Multiple channels are combined and amplified by only one amplifier
• CPC Class Codes: H03F 3/211 using a combination of several amplifiers H03F3/60 takes precedence
• CPC Class Codes: H03F 3/24 of transmitter output stages
• CPC Class Codes: H03F 3/38 DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers switched capacitor amplifiers H03F3/005
• CPC Class Codes: H03G 3/3042 in modulators, frequency-changers, transmitters or power amplifiers transmission power control in bidirectional transmission systems H04W52/04
• CPC Class Codes: H04B 1/04 Circuits

Abstract

Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.

Claims

1. An apparatus for power amplification, comprising:

one or more vector modulators configured to generate a plurality of substantially constant envelope signals;

a multiple-input single-output (MISO) amplifier configured to amplify and combine said substantially constant envelope signals to generate an output signal, wherein said MISO amplifier comprises at least a driver stage and a power amplifier stage; and

a control module configured to control a power level of said output signal based on an adjustment of one or more characteristics of said substantially constant envelope signals, wherein said control module comprises a transfer function module, the transfer function module having an output coupled to a corresponding input of the one or more vector modulators, said transfer function module output being configured to cause said one or more vector modulators to adjust an amplitude of said substantially constant envelope signals prior to amplification by the MISO amplifier.

2. The apparatus of claim 1, wherein said MISO amplifier further comprises a pre-driver stage.

3. The apparatus of claim 1, wherein said MISO amplifier is coupled to said one or more vector modulators, and wherein respective inputs of said one or more vector modulators are coupled to said transfer function module.

4. The apparatus of claim 1, wherein said one or more vector modulators are configured to adjust one or more phases of said substantially constant envelope signals.

5. The apparatus of claim 1, wherein said transfer function module is configured to adjust one or more amplitudes of said substantially constant envelope signals.

6. The apparatus of claim 1, wherein said one or more vector modulators are configured to adjust one or more phases of said substantially constant envelope signals in conjunction with said transfer function module to control power efficiency of said apparatus under varying operating conditions, wherein said transfer function module is configured to adjust one or more amplitudes of said substantially constant envelope signals.

7. The apparatus of claim 1, wherein said control module further comprises an autobias module.

8. The apparatus of claim 7, wherein said one or more vector modules, transfer function module, and autobias module are configured to operate in conjunction with each other to control power efficiency of said apparatus under varying operating conditions, wherein said autobias module is configured to control said driver stage and said power amplifier stage.

9. The apparatus of claim 8, wherein said autobias module is configured to control said driver stage and said power amplifier stage independently of each other.

10. The apparatus of claim 1, wherein said control module is configured to control a power level of said output signal based on at least one of an amplifier class of operation for said MISO amplifier, power efficiency of said MISO amplifier, and linearity of said MISO amplifier.

11. The apparatus of claim 10, wherein said control module is configured to instantaneously transition said MISO amplifier from a first amplifier class of operation to a second amplifier class of operation.

12. The apparatus of claim 1, wherein said control module is configured to instantaneously transition said MISO amplifier based on an instantaneous power level of said desired power level, an average output power of said desired power level, or a combination thereof.

13. The apparatus of claim 1, wherein said transfer function module is configured to receive an I- and a Q-signal and to output a respective amplitude signal for each of the I- and Q-signals to said one or more vector modulators.

14. The apparatus of claim 13, wherein said one or more vector modulators are configured to adjust a respective phase of the I and Q amplitude signals received from said transfer function module.

15. A method of power amplification, comprising:

generating a plurality of substantially constant envelope signals using one or more vector modulators;

amplifying and combining said substantially constant envelope signals using a multiple-input single-output (MISO) amplifier to generate an output signal, wherein said MISO amplifier comprises at least a driver stage and a power amplifier stage; and

adjusting a power level of said output signal, using a control module, based on an adjustment of one or more characteristics of said substantially constant envelope signals, wherein said control module comprises a transfer function module, the transfer function module having an output coupled to a corresponding input of the one or more vector or phase modulators, said transfer function module output being configured to cause said one or more vector modulators to adjust an amplitude of said substantially constant envelope signals prior to amplification by the MISO amplifier.

16. The method of claim 15, wherein adjusting said power level comprises adjusting one or more phases of said substantially constant envelope signals with said one or more vector modulators.

17. The method of claim 15, wherein adjusting said power level comprises adjusting one or more amplitudes of said substantially constant envelope signals with said transfer function module.

18. The method of claim 15, wherein adjusting said power level comprises adjusting one or more phases and one or more amplitudes of said substantially constant envelope signals to control power efficiency of said apparatus under varying operating conditions.

19. The method of claim 18, wherein adjusting said power level further comprises controlling said driver stage and said power amplifier stage to control power efficiency of said apparatus under varying operating conditions.

20. The method of claim 19, wherein controlling said driver stage and said power amplifier stage comprise controlling said driver stage and said power amplifier stage independently of each other.

21. The method of claim 15, wherein adjusting said power level comprises controlling a power level of said output signal based on at least one of an amplifier class of operation for said MISO amplifier, power efficiency of said MISO amplifier, and linearity of said MISO amplifier.

22. The method of claim 21, wherein controlling said power level of said output signal comprises instantaneously transitioning said MISO amplifier from a first amplifier class of operation to a second amplifier class of operation.

23. The method of claim 15, wherein adjusting said power level comprises instantaneously transitioning said MISO amplifier based on an instantaneous power level of said desired power level, an average output power of said desired power level, or a combination thereof.

24. An apparatus for power amplification, comprising:

one or more phase modulators configured to generate a plurality of substantially constant envelope signals;

a multiple-input single-output (MISO) amplifier configured to amplify and combine said substantially constant envelope signals to generate an output signal, wherein said MISO amplifier comprises at least a driver stage and a power amplifier stage; and

a control module configured to control a power level of said output signal based on an adjustment of one or more characteristics of said substantially constant envelope signals, wherein said control module comprises a transfer function module and wherein the output of said transfer function module is configured to cause said one or more phase modulators to adjust one or more amplitudes of said substantially constant envelope signals, the one or more phase modulators configured to receive a corresponding one or more outputs from said transfer function module.

25. The apparatus of claim 24, wherein said phase modulators comprise digital devices.

26. The apparatus of claim 24, wherein said MISO amplifier is coupled to said one or more phase modulators, and wherein respective inputs of said one or more phase modulators are coupled to said transfer function module.

27. The apparatus of claim 24, wherein said one or more phase modulators are configured to adjust one or more phases of said substantially constant envelope signals.

28. The apparatus of claim 24, wherein said transfer function module is configured to adjust one or more amplitudes of said substantially constant envelope signals.

29. The apparatus of claim 24, wherein said one or more phase modulators are configured to adjust one or more phases of said substantially constant envelope signals in conjunction with said transfer function module to control power efficiency of said apparatus under varying operating conditions.