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Comparator with signal related adaptive bias

  • US 4,147,944 A
  • Filed: 10/25/1977
  • Issued: 04/03/1979
  • Est. Priority Date: 10/25/1977
  • Status: Expired due to Term
First Claim
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1. In a voltage responsive comparator, said comparator including a differential amplifier having means for supplying a source of operating current, differential inputs, and an output that constitutes said comparator output, means for coupling a reference voltage to one of said differential inputs, and means for coupling a voltage source to the other of said differential inputs, said comparator ordinarily producing an error when coupled to voltage sources of limited current capability, the improvement comprising:

  • means for controlling said operating current in proportion to the current available from said voltage source; and

    means for biasing at least one input of said differential amplifier in proportion to said current available from said voltage source whereby said differential amplifier responds to said voltage source at current levels substantially below those useful in comparators without said improvement.

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