Power amplifier operation
AssigneeMassachusetts Institute of Technology
InventorsAndrew H. Zai, Michael D. Lockard, Kenneth E. Kolodziej, Jeffrey S. Herd
Life of this patent
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Abstract
Systems and methods for improving power amplifier operation are provided. A system may include a baseband signal generator communicatively coupled to a baseband signal digital-to-analog converter. The baseband signal digital-to-analog converter may be communicatively coupled to two or more power amplifiers. The system may also include an envelope signal generator communicatively coupled to an envelope signal digital-to-analog converter. The system may further include a supply modulator communicatively coupled to the envelope signal digital-to-analog converter and the two or more power amplifiers for shared envelope tracking across the two or more power amplifiers.
Claims19
A shared envelope tracking system comprising:
- a baseband signal generator communicatively coupled to a baseband signal digital-to-analog converter, the baseband signal digital-to-analog converter communicatively coupled to two or more power amplifiers;
- an envelope signal generator communicatively coupled to an envelope signal digital-to-analog converter;
- and
- a supply modulator communicatively coupled to the envelope signal digital-to-analog converter and the two or more power amplifiers for shared envelope tracking across the two or more power amplifiers.
A method for shared envelope tracking comprising:
- supplying a signal to two or more power amplifiers with a baseband signal generator communicatively coupled to a baseband signal digital-to-analog converter, the baseband signal digital-to-analog converter communicatively coupled to the two or more power amplifiers;
- modulating power amplifier input across the two or more power amplifiers with a supply modulator communicatively coupled to an envelope signal digital-to-analog converter and the two or more power amplifiers for shared envelope tracking;
- and
- wherein the supply modulator is shared across the two or more power amplifiers for shared envelope tracking.
A method for offsetting distortion in power amplifiers, the method comprising:
- applying digital pre-distortion to a baseband signal prior to the baseband signal reaching a baseband signal digital-to-analog converter to offset distortion in two or more power amplifiers, wherein two or more antennas are each communicatively coupled to at least one of the power amplifiers;
- and
- applying a time delay after the baseband signal reaches the baseband signal digital-to-analog converter so that a resulting signal reaches one of the two or more power amplifiers later than another of the two or more two or more power amplifiers.
Dependencies are inferred from the claim text.