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Full-wave rectifier and method of operation for a recognition system

  • US 5,870,031 A
  • Filed: 01/31/1997
  • Issued: 02/09/1999
  • Est. Priority Date: 01/31/1996
  • Status: Expired due to Term
First Claim
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1. An improved full-wave rectifier for a transponder, said transponder being formed on a one substrate and associated with a matching member which operates to control a control mechanism of a device;

  • the matching member and other non-matching members containing facilities each of which, when receiving energy transmitted from a transmitter/receiver an antenna produce a respective unique recognition signal in the transponder;

    control of the device being possible only upon simultaneous occurrence of both operation of the control mechanism and production of a recognition signal by the matching member;

    wherein the improved full-wave rectifier comprises;

    a first transistor and a second transistor in combination forming a first transistor pair for minimizing voltage drop between ground and the transponder substrate;

    a third transistor and a fourth transistor in combination forming a second transistor pair for minimizing the voltage drop between the alternating current peak voltage and the output voltage of said full-wave rectifier;

    said first transistor pair and said second transistor pair being controlled by alternating current voltage input signals to produce a full-wave rectified alternating current voltage output; and

    a regulator circuit for decoupling said first transistor pair and said second transistor pair from capacitive loads of said full-duplex transponder.

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