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ENVELOPE TRACKING SIGNAL GENERATOR INCORPORATING TRIM CELL

  • US 20140085008A1
  • Filed: 09/23/2013
  • Published: 03/27/2014
  • Est. Priority Date: 09/23/2012
  • Status: Active Grant
First Claim
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1. An envelope tracking system, comprising:

  • an envelope detector operative to extract an envelope from an input RF signal;

    an analog to digital converter operative to generate a trim command based on said envelope; and

    a DC-DC converter operative to generate a power amplifier (PA) supply voltage in response to said trim command, said DC-DC converter comprising;

    a switching circuit coupled to a DC voltage source and operative to convert an input voltage into said PA supply voltage across an output capacitor in accordance with a reference voltage;

    a feedback circuit coupled to said switching circuit and operative to generate a drive signal for said switching circuit; and

    a plurality of trim cells, each trim cell incorporating a trim capacitor adapted to be charged to a predetermined trim voltage and connected in series with said output capacitor in accordance with a trim command thereby increasing said PA supply voltage substantially instantaneously.

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