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Isolation amplifier with precise timing of signals coupled across isolation barrier

  • US 4,835,486 A
  • Filed: 05/10/1988
  • Issued: 05/30/1989
  • Est. Priority Date: 04/28/1986
  • Status: Expired due to Term
First Claim
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1. A digital isolation circuit comprising in combination:

  • (a) first means for producing a first pulse signal and a second pulse signal that is the logical complement of the first pulse signal;

    (b) first and second isolation barrier means for coupling a portion of each of the first and second pulse signals, respectively, from the first means to a first terminal and a second terminal;

    (c) means for differentiating the first and second pulse signals as they are coupled across the first and second isolation barrier means, respectively, to produce differentiated third and fourth pulse signals each having certain edges with times of occurrence corresponding precisely to times of occurrence of the certain edges of the first pulse signal;

    (d) means for amplifying the third and fourth pulse signals to produce a differential signal;

    (e) first and second comparators; and

    (f) means for applying the differential signal to inputs of the first and second comparators to cause the first and second comparators to sense relative positive and negative excursions of the differential signal, and thereby cause the first and second comparators to switch at times precisely corresponding to times of occurrence of leading and trailing edges, respectively, of the first pulse signal.

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