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Identification and/or sensor system

  • US 5,872,520 A
  • Filed: 10/24/1996
  • Issued: 02/16/1999
  • Est. Priority Date: 10/24/1995
  • Status: Expired due to Term
First Claim
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1. An identification and/or sensor system, comprising:

  • a transmitter sending query signals by radio;

    an identification and/or sensor configuration receiving the query signals, sending answer signals and having resonators for defining at least one parameter to be queried;

    a receiver evaluating the answer signals sent back by said identification and/or sensor configuration, said receiver having a scanned phase-locked loop triggered by the answer signal, said phase-locked loop having a sample and hold circuit, and said receiver having a threshold value detector triggering said sample and hold circuit;

    said phase-locked loop also having a phase detector, a reversing switch downstream of said sample and hold circuit, a voltage-controlled oscillator and a loop filter having an output coupled through said sample and hold circuit to said voltage-controlled oscillator and coupled directly through said reversing switch to said voltage-controlled oscillator; and

    said threshold value detector is an asynchronous detector furnishing two threshold value output signals for variously high input signal levels, one of the output signals represents a high input signal level and couples said sample and hold circuit to an output of said phase detector, and another of the output signals represents a low input signal level coupling said loop filter to the output of said phase detector, directly through said reversing switch or through said sample and hold circuit.

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