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PASSIVELY POWERING A WIRELESS COMMUNICATIONS DEVICE

  • US 20120309295A1
  • Filed: 05/31/2011
  • Published: 12/06/2012
  • Est. Priority Date: 05/31/2011
  • Status: Active Grant
First Claim
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1. A wireless device comprising:

  • an RF interface configured to receive an RF signal and configured to provide an output data signal derived from the RF signal;

    logic circuitry configured to receive the output data signal and provide an output analog signal;

    power circuitry coupled to the RF interface and configured to provide DC operating power derived from the RF signal to the RF interface and the logic circuitry;

    a first impedance matching transformer having an input coupled to the logic circuitry and having an output; and

    a first transducer coupled to the output of the first impedance matching transformer and configured to produce an audio signal based on the output analog signal.

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