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Method and apparatus for effiviently phase modulating a subcarrier signal for an inductively coupled transponder

  • US 5,824,891 A
  • Filed: 03/25/1997
  • Issued: 10/20/1998
  • Est. Priority Date: 04/03/1996
  • Status: Expired due to Term
First Claim
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1. An apparatus for conducting short range wireless electronic communication, said apparatus comprising:

  • a transmitting circuit including a transmitting coil and a driver generating electrical energy in said transmitting coil; and

    a receiving circuit spaced from said transmitting circuit and adapted to be positioned adjacent said transmitting coil such that, when said receiving circuit is positioned adjacent said transmitting coil, said receiving circuit is inductively coupled to said transmitting circuit, said receiving circuit including a coil, a capacitor connected in parallel with said coil to form a resonant circuit with said coil, and a quadrature phase shift keyed modulator connected to said resonant circuit.

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