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Device for detecting a human body

  • US 6,366,204 B1
  • Filed: 01/26/2000
  • Issued: 04/02/2002
  • Est. Priority Date: 05/26/1998
  • Status: Expired due to Fees
First Claim
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1. A circuit for detecting presence comprising:

  • a receiver having an antenna-forming element;

    an oscillator receiving an output signal from said receiver, said oscillator generating an output signal having a frequency of oscillation, the oscillator including a resonant stage having an input and an amplification stage coupled to the input of said resonant stage and providing said oscillator with gain such that the frequency of oscillation of the signal output by the oscillator is modified when an object is in the immediate proximity of the antenna-forming element of the receiver; and

    a processor for detecting a variation in the frequency of oscillation of the signal output by the oscillator and for generating an information signal representing the detection of a presence when such a frequency variation is detected.

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