Differential amplifier with gain compensation

  • US 4,929,909 A
  • Filed: 03/27/1989
  • Issued: 05/29/1990
  • Est. Priority Date: 03/27/1989
  • Status: Expired due to Term
First Claim
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1. A gain-compensated differential amplifier circuit comprising:

  • (a) a transistor differential amplifier, with reasonably matched current gains, operating at a tail current Itail ;

    (b) a transistor current source responsive to a control voltage for generating said tail current as a function of the control voltage;

    (c) control voltage generating means for generating, as the control voltage, a voltage which varies proportionately to absolute temperature; and

    (d) the control voltage generating means including means for functionally relating the control voltage to the intrinsic emitter resistance of the current source.

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