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Optical isolation circuit for bidirectional communication lines

  • US 4,282,604 A
  • Filed: 04/04/1979
  • Issued: 08/04/1981
  • Est. Priority Date: 04/04/1979
  • Status: Expired due to Term
First Claim
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1. An isolation circuit for interfacing a data transceiver and a set of bidirectional communication lines, comprising:

  • a first light emitting device responsive to electrical signals generated by said transceiver;

    a first light responsive transistor having a control terminal electrically coupled to said communication lines, a first optical path being established between said first light emitting device and said first light responsive transistor;

    a second light emitting device responsive to incoming signals on said communication lines and to said first light responsive transistor; and

    a second light responsive transistor having a control terminal electrically coupled to said transceiver, said first light emitting device being further responsive to said second light responsive transistor;

    each one of said optical paths carrying negative feedback derived from data signals in the other one of said optical paths.

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