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Homodyne RFID receiver and method

  • US 20060109128A1
  • Filed: 11/19/2004
  • Published: 05/25/2006
  • Est. Priority Date: 11/19/2004
  • Status: Active Grant
First Claim
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1. An RFID circuit, comprising:

  • an RF carrier signal source;

    a hybrid coupled to the RF carrier signal source operable to generate first and second phase-shifted RF carrier signals;

    first and second mixers coupled to the hybrid each operable to multiply a respective one of the first and second carrier signals and a received backscattered modulated carrier signal and generate first and second baseband signals, respectively; and

    first logic coupled to the first and second mixers operable to select one of the first and second baseband signals having a larger amplitude as a demodulated RFID output signal.

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