High speed read/write AVI system

  • US 5,287,112 A
  • Filed: 04/14/1993
  • Issued: 02/15/1994
  • Est. Priority Date: 04/14/1993
  • Status: Expired due to Fees
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First Claim
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1. A transponder for communicating with an interrogator unit, said transponder comprising:

  • a) a high Q-factor resonant circuit of frequency f1 for receiving RF powering signals;

    b) a tuning circuit which when in electrical communication with said resonant circuit is operable to form a lower Q-factor resonant circuit of frequency f3 for receiving RF communications from said interrogator unit;

    c) a control circuit which is in electrical communication with said high Q-factor resonant circuit and said tuning circuit and is operable to connect said tuning circuit to said high Q-factor resonant circuit in order to form said lower Q-factor resonant circuit, said control circuit further operable to convert said RF powering signals to a DC current for storing energy, said control circuit still further operable to demodulate signals received by said lower Q-factor resonant circuit; and

    d) an energy storage device for storing the energy received in said DC current from said control circuit.

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