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Data transmission circuit having a station and a response circuit

  • US 6,167,094 A
  • Filed: 04/15/1999
  • Issued: 12/26/2000
  • Est. Priority Date: 10/15/1996
  • Status: Expired due to Term
First Claim
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1. A data transmission circuit, comprising:

  • a station having an amplitude demodulator, a primary coil connected to said amplitude demodulator, and a signal generator connected to said primary coil for producing an alternating magnetic field at a carrier frequency; and

    a response circuit having a secondary coil and an amplitude modulator for influencing a load on said secondary coil, said amplitude modulator configured such that the alternating magnetic field can be modulated with a data signal, said response circuit also having a phase modulator for influencing electrical characteristics of said secondary coil, and at least one of said amplitude modulator and said phase modulator to be driven by at least one modulation signal.

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