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Transitioning from envelope tracking to average power tracking

  • US 9,207,692 B2
  • Filed: 10/17/2013
  • Issued: 12/08/2015
  • Est. Priority Date: 10/18/2012
  • Status: Active Grant
First Claim
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1. Circuitry comprising:

  • an offset capacitive element coupled between a switching output and an analog output; and

    an envelope tracking power supply having the switching output and the analog output, and configured to;

    operate in one of an envelope tracking mode, a transition mode, and an average power tracking mode;

    during the envelope tracking mode, provide an envelope power supply signal using the switching output and the analog output, wherein the envelope power supply signal at least partially envelope tracks an RF transmit signal;

    during the transition mode, drive a voltage across the offset capacitive element from a first voltage to a second voltage; and

    during the average power tracking mode, provide the envelope power supply signal, which is about equal to the second voltage, wherein;

    during a transition from the envelope tracking mode to the transition mode, the offset capacitive element has the first voltage; and

    during a transition from the transition mode to the average power tracking mode, the offset capacitive element has the second voltage.

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