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Circuits and methods for detecting the presence of a powered device in a powered network

  • US 20050132240A1
  • Filed: 12/16/2003
  • Published: 06/16/2005
  • Est. Priority Date: 12/16/2003
  • Status: Active Grant
First Claim
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1. A circuit for detecting the presence of a powered device in a powered network connection, the circuit comprising:

  • an oscillator for providing a time-varying voltage signal; and

    an analog amplifier circuit for receiving the time-varying voltage signal from the oscillator as an input, applying the time-varying voltage signal to the powered network connection, and sensing the current flowing through a coupling capacitor required to drive a load connected to the analog amplifier circuit.

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