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Isolation system with analog communication across an isolation barrier

  • US 7,110,531 B2
  • Filed: 02/15/2001
  • Issued: 09/19/2006
  • Est. Priority Date: 02/17/2000
  • Status: Expired due to Term
First Claim
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1. An isolation system with analog communication across an isolation barrier comprising:

  • an isolation barrier circuit having at least one isolation element;

    a digital to analog circuit configured to provide a constant average analog output signal to the isolation barrier and having an input for receiving an input digital signal to be communicated across the isolation barrier, said digital to analog circuit including a digital to analog converter with an input for receiving said input digital signal and an analog modulation circuit responsive to said digital to analog converter for providing said constant average analog output signal; and

    an analog to digital circuit having an input coupled to the analog output of the isolation barrier circuit for providing a digital output signal.

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