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Comparator circuit

  • US 4,047,059 A
  • Filed: 05/24/1976
  • Issued: 09/06/1977
  • Est. Priority Date: 05/24/1976
  • Status: Expired due to Term
First Claim
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1. A comparator, for producing an output signal dependent upon both the ratio of the magnitudes and the sum of the magnitudes of first and second input signals to be compared, comprising, in combination:

  • two supply terminals for receiving an operating voltage thereacross and a circuit output terminal for providing said output signal thereat;

    input means for conducting first and second currents between said supply terminals and for independently controlling the magnitudes thereof in accordance with the magnitudes of said first and second input signals, respectively;

    controlled conduction means coupled between one of said supply terminals and said circuit output terminal for conducting a current therebetween proportional to a control signal;

    means for summing said first and second currents to obtain said control signal, whereby said current conducted by said controlled conduction means varies in proportion to the sum of the magnitudes of said first and second input signals;

    switch means connected between said output terminal and the other of said supply terminals; and

    means coupled to said switch means and responsive to said first and second currents for closing said switch means when the ratio between said first and second currents is a first value and for opening said switch means when said ratio is a different value.

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