Control of MISO node

• US 9,705,540 B2
• Filed: 06/29/2015
• Issued: 07/11/2017
• Est. Priority Date: 10/24/2005
• Status: Active Grant

• Current Assignee: ParkerVision, Inc.
• Original Assignee: ParkerVision, Inc.
• Inventors: Rawlins, Gregory S., Sorrells, David F.
• Primary Examiner(s): Nguyen, Patricia T
• Application Number:
  US14/753,470
• Publication Number:
  US 20150326259A1
• Time in Patent Office: 743 Days
• Field of Search: 330147, 330 10
• CPC Class Codes: H03F 1/0294 using vector summing of two or more constant amplitude phase-modulated signals
• CPC Class Codes: H03F 3/602 Combinations of several amplifiers
• CPC Class Codes: H04B 1/0475 with means for limiting noise, interference or distortion H04B1/0483 takes precedence
• CPC Class Codes: H04B 1/16 Circuits

Abstract

A method for generating a radio frequency (RF) signal is disclosed herein. The method includes generating, with a plurality of analog-to-digital converters, analog control signals. A modulated control signal is generated, using a modulator, based on the analog control signals. A biased modulated control signal is generated, using an amplifier, based on the modulated control signal and a first bias control signal. Further, the RF signal is generated, using a multiple-input-single-output (MISO) device, based on the biased modulated control signal and a second bias control signal.

Claims

1. A method for generating a radio frequency (RF) signal, the method comprising:

generating, with a plurality of analog-to-digital converters, analog control signals;

generating, with a modulator, a modulated control signal based on the analog control signals;

generating, with an amplifier, a biased modulated control signal based on the modulated control signal and a first bias control signal; and

generating the RF signal, with a multiple-input-single-output (MISO) device, based on the biased modulated control signal and a second bias control signal.

2. The method of claim 1, further comprising:

generating, with another modulator, another modulated control signal; and

generating, with another amplifier, another biased modulated control signal based on the another modulated control signal and a third bias control signal.

3. The method of claim 2, wherein the generating the RF signal comprises generating the RF signal based on the biased modulated control signal, the second bias control signal, and the another biased modulated control signal.

4. The method of claim 1, wherein the generating the biased modulated control signal comprises controlling an input drive of the amplifier with the first bias control signal.

5. The method of claim 1, wherein the generating the RF signal comprises controlling an input drive of the MISO device as a function of an envelope of the RF signal.

6. The method of claim 5, wherein the input drive of the MISO device approaches zero when the envelope of the RF signal undergoes a change in phase.

7. The method of claim 6, wherein the change in phase approaches 180 degrees.

8. The method of claim 1, wherein the generating the RF signal comprises compensating for an asymmetry in at least one of an amplitude and a phase in the modulated control signal and the biased modulated control signal.

9. The method of claim 1, wherein the generating the RF signal comprises concurrently adjusting the control signals, the first bias signal, and the second bias signal to change a phase in an envelope of the RF signal.

10. The method of claim 1, wherein the RF signal conforms to the EDGE, GSM, CDMA2000, WCDMA, OFDM, or WLAN communication standard.

11. An apparatus for generating a radio frequency (RF) signal, the apparatus comprising:

a plurality of digital-to-analog converters (ADCs), wherein each of the ADCs is configured to generate an analog control signal;

a modulator configured to generate a modulated control signal based on the analog control signals from the plurality of ADCs;

an amplifier configured to generate a biased modulated control signal based on the modulated control signal and a first bias control signal and;

a multiple-input-single-output (MISO) device configured to generate the RF signal based on the biased modulated control signal and a second bias control signal.

12. The apparatus of claim 11, further comprising:

another modulator configured to generate another modulated control signal; and

another amplifier configured to generate another biased modulated control signal based on the another modulated control signal and a third bias control signal.

13. The apparatus of claim 12, wherein the MISO device is configured to generate the RF signal based on the biased modulated control signal, the second bias control signal, and the another biased modulated control signal.

14. The apparatus of claim 11, wherein the first bias control signal is configured to control an input drive of the amplifier.

15. The apparatus of claim 11, wherein the second bias control signal is configured to control an input drive of the MISO device as a function of an envelope of the RF signal.

16. The apparatus of claim 15, wherein the input drive of the MISO device approaches zero when the envelope of the RF signal undergoes a change in phase.

17. The apparatus of claim 16, wherein the change in phase approaches 180 degrees.

18. The apparatus of claim 11, wherein the first and second bias control signals are configured to compensate for an asymmetry in at least one of an amplitude and a phase in the modulated control signal and the biased modulated control signal.

19. The apparatus of claim 11, wherein the control signals received by the ADCs, the first bias signal, and the second bias signal are adjusted concurrently to change a phase in an envelope of the RF signal.

20. The apparatus of claim 11, wherein the RF signal conforms to the EDGE, GSM, CDMA2000, WCDMA, OFDM, or WLAN communication standard.