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Temperature-compensated voltage level sense circuit

  • US 5,365,129 A
  • Filed: 04/29/1993
  • Issued: 11/15/1994
  • Est. Priority Date: 04/29/1993
  • Status: Expired due to Term
First Claim
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1. A circuit for sensing the level of an input signal, comprising:

  • a comparator, having first and second inputs;

    an input leg, having an input coupled to an input terminal receiving the input signal, and coupled to the first comparator input, comprising;

    an input capacitor;

    a first switch, connected between the input terminal and said input capacitor;

    a second switch, connected between the input capacitor and the first comparator input;

    a first bias circuit comprising a bipolar transistor, for defining a first diode voltage;

    a first charge-sharing capacitor;

    a third switch, connected between the emitter of the bipolar transistor in said first bias circuit and said first charge-sharing capacitor; and

    a fourth switch, connected between the first charge-sharing capacitor and said first comparator input; and

    a reference leg, coupled to the second comparator input, comprising;

    a second bias circuit, comprising a bipolar transistor, for defining a second diode voltage different from said first diode voltage;

    a second charge-sharing capacitor;

    a fifth switch, connected between the emitter of the bipolar transistor in said second bias circuit and said second charge-sharing capacitor; and

    a sixth switch, connected between the second charge-sharing capacitor and said second comparator input;

    wherein the difference between said first diode voltage and said second diode voltage increases with increasing temperature.

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