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Bandgap voltage reference and method with further temperature correction

  • US 4,939,442 A
  • Filed: 03/30/1989
  • Issued: 07/03/1990
  • Est. Priority Date: 03/30/1989
  • Status: Expired due to Term
First Claim
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1. A circuit for generating a stable reference voltage over a wide temperature range, comprising:

  • a voltage generator for providing a relatively stable output voltage within a known temperature range, said generator including (i) first and second mismatched bipolar transistors, the emitters of said first and second bipolar transistors tied together, (ii) a first resistor connected between the bases of said first and second bipolar transistors, and (iii) a second resistor in series with said first resistor and passing said first current, said generator providing said relatively stable output voltage from current determined by said first resistor; and

    circuitry for adjusting said output voltage responsive to a predetermined temperature to maintain a stable output voltage, said circuitry providing current at through said second resistor and parallel said first resistor for temperatures outside of said known temperature range.

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