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TEMPERATURE DEPENDENT VOLTAGE REFERENCE CIRCUIT

  • US 3,851,241 A
  • Filed: 08/27/1973
  • Issued: 11/26/1974
  • Est. Priority Date: 08/27/1973
  • Status: Expired due to Term
First Claim
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1. In combination:

  • a first and a second input terminal between which a temperaturedependent reference voltage is produced;

    a first and a second transistor of the same conductivity type, each operated at substantially the same temperature upon which temperature said reference voltage depends, each of said first and said second transistors having a base and an emitter electrode and a base-emitter junction therebetween and each having a collector electrode;

    a potential divider having an input circuit connected between said first and said second input terminals and having an output circuit connected between the base electrodes of said first and said second transistors;

    means for supplying an operating current flow between said first and said second input terminals;

    means for conducting a portion of said operating current from said first input terminal to the joined emitter electrodes of said first and said second transistors;

    a first current amplifier having an input terminal connected to said first transistor collector electrode, having a common terminal connected to said second input terminal, having an output terminal connected to said second transistor collector electrode, and having an inverting or negative current gain between its said input and output terminals; and

    a second current amplifier having an input terminal connected to said first current amplifier output terminal and having a common and an output terminal connected to separate ones of said first and said second input terminals;

    a degenerative feedback loop being formed by the aforesaid connections, which operates to maintain the densities of current flow through the base-emitter junctions of said first and said second transistors in a predetermined ratio other than unity.

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