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High efficiency RF amplifier and envelope modulator

  • US 20070066224A1
  • Filed: 02/27/2006
  • Published: 03/22/2007
  • Est. Priority Date: 02/28/2005
  • Status: Abandoned Application
First Claim
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1. An RFID reader, comprising:

  • a Class-C power amplifier having an input, an output, and a supply voltage;

    a modulator coupled to the supply voltage of the Class-C power amplifier; and

    an RF carrier signal coupled to the input of the Class-C power amplifier;

    wherein the modulator changes the supply voltage of the Class-C power amplifier resulting in highly controlled amplitude modulation of the RF carrier signal at the output of the Class-C power amplifier.

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