Monotonic conversion of RF power amplifier calibration data

• US 8,975,959 B2
• Filed: 11/26/2012
• Issued: 03/10/2015
• Est. Priority Date: 11/30/2011
• Status: Active Grant

• Current Assignee: Qorvo US, Inc. (Qorvo, Inc.)
• Original Assignee: RF Micro Devices Incorporated (Qorvo, Inc.)
• Inventors: Khlat, Nadim
• Primary Examiner(s): Choe, Henry
• Application Number:
  US13/684,826
• Publication Number:
  US 20130135045A1
• Time in Patent Office: 834 Days
• Field of Search: 330/136, 330/149, 330/129, 375/297
• US Class Current: 330/136
• CPC Class Codes: H03F 1/0227 using supply converters
• CPC Class Codes: H03F 1/3247 using feedback acting on predistortion circuits H03F1/3264 takes precedence
• CPC Class Codes: H03G 1/04 Modifications of control circuit to reduce distortion caused by control modifications to reduce influence of variations of internal impedance of amplifying elements caused by control H03F1/08

Abstract

Circuitry, which includes data memory and processing circuitry, is disclosed. The data memory is used to store look-up table (LUT)-based radio frequency (RF) power amplifier (PA) calibration data. The processing circuitry converts at least a portion of the LUT-based RF PA calibration data to provide monotonic response curve-based data. As such, a magnitude of an envelope power supply control signal is determined based on a magnitude of an RF input signal using the monotonic response curve-based data.

Claims

1. Circuitry comprising:

data memory adapted to store look-up table (LUT)-based radio frequency (RF) power amplifier (PA) calibration data; and

processing circuitry adapted to convert at least a portion of the LUT-based RF PA calibration data to provide monotonic response curve-based data, wherein a magnitude of an envelope power supply control signal is based on a magnitude of an RF input signal and using the monotonic response curve-based data, wherein the monotonic response curve-based data is a pre-distortion of the LUT-based RF PA calibration data to reduce noise on an envelope power supply signal, wherein the envelope power supply signal is based on the envelope power supply control signal.

4. The circuitry of claim 1 wherein the monotonic response curve-based data is LUT-based data.

11. The circuitry of claim 1 further comprising RF calibration circuitry, which comprises the data memory and the processing circuitry.

12. The circuitry of claim 11 wherein RF system control circuitry is adapted to provide the envelope power supply control signal based on the magnitude of the RF input signal using the monotonic response curve-based data.

13. The circuitry of claim 12 wherein the RF system control circuitry is further adapted to provide the RF input signal.

14. The circuitry of claim 12 wherein the RF system control circuitry is further adapted to provide the envelope power supply control signal via a digital communications bus.

15. The circuitry of claim 1 further comprising RF system control circuitry, which comprises the data memory and the processing circuitry.

16. The circuitry of claim 15 wherein the RF system control circuitry is adapted to provide the envelope power supply control signal based on the magnitude of the RF input signal using the monotonic response curve-based data.

17. The circuitry of claim 16 wherein the RF system control circuitry is further adapted to provide the RF input signal.

18. The circuitry of claim 16 wherein the RF system control circuitry is further adapted to provide the envelope power supply control signal via a digital communications bus.

19. The circuitry of claim 1 further comprising RF transmitter circuitry, which comprises the data memory and the processing circuitry.

20. The circuitry of claim 19 wherein the RF transmitter circuitry is adapted to provide the envelope power supply signal based on the envelope power supply control signal.

21. The circuitry of claim 20 wherein the RF transmitter circuitry comprises an RF PA adapted to receive and amplify the RF input signal to provide an RF transmit signal using the envelope power supply signal to provide power for amplification.

22. The circuitry of claim 19 wherein the RF transmitter circuitry is further adapted to receive an unmodified envelope power supply control signal via a digital communications bus.

2. Circuitry comprising:

data memory adapted to store look-up table (LUT)-based radio frequency (RF) power amplifier (PA) calibration data; and

processing circuitry adapted to convert at least a portion of the LUT-based RF PA calibration data to provide monotonic response curve-based data, wherein a magnitude of an envelope power supply control signal is based on a magnitude of an RF input signal and using the monotonic response curve-based data, wherein the monotonic response curve-based data is based on a high order polynomial interpolation of at least a portion of the LUT-based RF PA calibration data.

3. The circuitry of claim 2 wherein a number of data points used in the high order polynomial interpolation is at least ten times an order of the high order polynomial interpolation.

5. Circuitry comprising:

data memory adapted to store look-up table (LUT)-based radio frequency (RF) power amplifier (PA) calibration data; and

processing circuitry adapted to convert at least a portion of the LUT-based RF PA calibration data to provide monotonic response curve-based data, wherein a magnitude of an envelope power supply control signal is based on a magnitude of an RF input signal and using the monotonic response curve-based data, wherein the LUT-based RF PA calibration data is based on calibrating a calibration RF PA for approximately constant gain operation over a calibration RF power range.

6. Circuitry comprising:

data memory adapted to store look-up table (LUT)-based radio frequency (RF) power amplifier (PA) calibration data; and

processing circuitry adapted to convert at least a portion of the LUT-based RF PA calibration data to provide monotonic response curve-based data, wherein a magnitude of an envelope power supply control signal is based on a magnitude of an RF input signal and using the monotonic response curve-based data, wherein the monotonic response curve-based data is based on a monotonic response curve that is representative of a calibration envelope power supply signal relative to a calibration RF input signal.

7. The circuitry of claim 6 wherein as an envelope of the calibration RF input signal increases, a magnitude of the calibration envelope power supply signal never decreases.

8. The circuitry of claim 6 wherein a calibration RF PA is adapted to receive and amplify the calibration RF input signal to provide a calibration RF output signal using the calibration envelope power supply signal to provide power for amplification.

9. The circuitry of claim 8 wherein:

an envelope power supply signal is based on the envelope power supply control signal;

an RF PA is adapted to receive and amplify the RF input signal to provide an RF transmit signal using the envelope power supply signal to provide the power for amplification; and

the RF PA is the calibration RF PA.

10. The circuitry of claim 8 wherein:

an envelope power supply signal is based on the envelope power supply control signal;

an RF PA is adapted to receive and amplify the RF input signal to provide an RF transmit signal using the envelope power supply signal to provide the power for amplification; and

the RF PA is not the calibration RF PA.

23. A method comprising:

storing look-up table (LUT)-based radio frequency (RF) power amplifier (PA) calibration data; and

converting at least a portion of the LUT-based RF PA calibration data to provide monotonic response curve-based data, wherein a magnitude of an envelope power supply control signal is based on a magnitude of an RF input signal and using the monotonic response curve-based data, wherein the monotonic response curve-based data is a pre-distortion of the LUT-based RF PA calibration data to reduce noise on an envelope power supply signal, wherein the envelope power supply signal is based on the envelope power supply control signal.