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Bandgap voltage comparator used as a low voltage detection circuit

  • US 6,268,764 B1
  • Filed: 02/18/2000
  • Issued: 07/31/2001
  • Est. Priority Date: 02/18/2000
  • Status: Expired due to Term
First Claim
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1. A bandgap voltage comparator, comprising:

  • first and second transistors forming a first current mirror, wherein the second transistor is diode connected;

    third and fourth transistors forming a second current mirror, wherein the third transistor is diode connected;

    each of the first, second, third and fourth transistors comprising an emitter, base and collector;

    a first resistor having a first and a second end, wherein the first end is connected to the base and the collector of the second transistor, and to the base of the first transistor;

    the first resistor second end is connected to a first voltage node;

    a second resistor having a first and a second end, wherein the first end is connected to the base and collector of the third transistor, and to the base of the fourth transistor;

    the second resistor second end is connected to the first resistor first end; and

    the first, second, third and fourth transistor emitters are connected to a second voltage node.

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