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US 2015/0091655 A1Published application
Optimal Envelope Tracking Reference Waveform Generation
AssigneeBroadcom Corporation
InventorsDmitriy Rozenblit, Vipin Kumar Aggarwal
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Abstract
A method and apparatus is provided to improve upon the efficiency of a power amplifier. Suitable hardware/software in the form of circuitry, logic gates, and/or code functions to construct an envelope tracking waveform of an input communications signal and modulate the input supply voltage based on power amplifier circuitry operational parameters such as slew rates.
Claims20
A method of dynamic control of power amplifier circuitry, the method comprising:
- generating a complex envelope from a baseband transmit signal;
- determining signal peaks within the generated complex envelope;
- obtaining one or more parameters of the power amplifier circuitry;
- determining start times to initiate changes in amplification of the power amplifier circuitry to substantially achieve the determined signal peaks of the generated complex envelope based on the determined one or more parameters of the power amplifier circuitry;
- generating an envelope tracking waveform based on the determined start times and on the complex envelope;
- and
- dynamically controlling the power amplifier circuitry based on the generated envelope tracking waveform.
4 more elements
A communications circuit comprising:
- power amplifier circuitry, the power amplifier circuitry including a communications signal input;
- an envelope tracking waveform constructor configured to generate an envelope tracking waveform of a communications signal based on one or more operational parameters of the power amplifier circuitry, and
- a power supply switcher configured to receive the shaped envelope tracking waveform and dynamically control power amplification of the communications signal according to the envelope tracking waveform.
A method to increase power amplifier circuitry efficiency, the method comprising:
- in a first communications signal processing path, delaying and processing a communications signal;
- in a second communications signal processing path, analyzing the delayed communications signal to:
- generate a complex envelope;
- generate an envelope tracking waveform substantially matching peaks of the generated complex envelope, wherein the envelope tracking waveform is shaped to account for one or more operational parameters of the power amplifier circuitry;
- and
- coupling the shaped envelope tracking waveform to a power amplifier switcher of the power amplifier circuitry for modulating a supply voltage.
3 more elements
Dependencies are inferred from the claim text.