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Analog isolation system with digital communication across a capacitive barrier

  • US 5,870,046 A
  • Filed: 04/22/1997
  • Issued: 02/09/1999
  • Est. Priority Date: 04/22/1997
  • Status: Expired due to Term
First Claim
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1. An isolation barrier for conveying an electrical signal from a transmitting circuit to a receiving circuit while electrically isolating the transmitting circuit from the receiving circuit, comprising:

  • an isolation capacitor;

    a synchronous analog-to-digital converter having an input connected to the transmitting circuit for receiving the electrical signal to be transmitted across the barrier, and an output connected to a first side of the isolation capacitor for providing a synchronous digital signal to the isolation capacitor;

    a synchronous digital-to-analog converter having an input connected to a second side of the isolation capacitor for receiving the synchronous digital signal therefrom, and having an output connected to the receiving circuit for providing an analog signal thereto; and

    a power supply having an input connected to the second side of the isolation capacitor to receive the synchronous digital signal therefrom, the power supply comprising a rectifier circuit for providing a DC voltage derived from energy contained in the synchronous digital signal.

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