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Low power digital signal isolator

  • US 5,995,252 A
  • Filed: 03/03/1997
  • Issued: 11/30/1999
  • Est. Priority Date: 03/03/1997
  • Status: Expired due to Fees
First Claim
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1. A device for isolating a signal comprising:

  • a. a differential pulse outputting means for receiving a first digital signal having a predetermined period and for producing differentiated pulses at a leading edge and at a trailing edge of said first digital signal;

    b. a first photo-coupler having a phototransistor activated for a period of time which is substantially less than one half of said predetermined period of said first digital signal by said differentiated pulse produced at said leading edge;

    c. a second photo-coupler having a phototransistor activated for a period of time which is substantially less than one half of said predetermined period of said first digital signal by said differentiated pulse produced at said trailing edge; and

    d. a positive feedback means connected in push-pull fashion with said first and second photo-couplers for producing a second digital signal corresponding to said first digital signal.

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