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Optimal switching frequency for envelope tracking power supply

  • US 9,065,505 B2
  • Filed: 01/30/2013
  • Issued: 06/23/2015
  • Est. Priority Date: 01/31/2012
  • Status: Active Grant
First Claim
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1. A radio frequency (RF) communications system configured to process RF signals associated with at least a first RF communications band and comprising:

  • an RF power amplifier (PA) configured to receive and amplify an RF input signal to provide an RF transmit signal using an envelope power supply signal; and

    an envelope tracking power supply configured to provide the envelope power supply signal, such that;

    the first RF communications band has a first bandwidth;

    the envelope power supply signal has switching ripple based on a programmable switching frequency;

    the programmable switching frequency is selected to be greater than the first bandwidth;

    a first guard band is adjacent to the first RF communications band, such that frequencies in the first guard band are greater than frequencies in the first RF communications band;

    a first guard band-based bandwidth spans the first RF communications band and the first guard band; and

    the programmable switching frequency is further selected to be greater than the first guard band-based bandwidth.

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