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Comparator circuit

  • US 20020125942A1
  • Filed: 02/14/2002
  • Published: 09/12/2002
  • Est. Priority Date: 02/14/2001
  • Status: Abandoned Application
First Claim
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1. A comparator circuit, comprising:

  • a first operational amplifier having a differential input;

    first and second voltage dividers coupled to a variable and a constant voltage source, respectively, having outputs coupled to the differential input to supply a differential input voltage thereto, the first operational amplifier having an output coupled to the differential input and providing an output voltage stepwise varying between first and second voltage levels at an inversion of the differential input voltage, and one of the first and second voltage dividers having a stepwise variable voltage dividing factor controlled by the output voltage of the first operational amplifier to increase the magnitude of the differential input voltage by a step value upon the inversion of the differential input voltage.

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