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Amplifier with active bias compensation and method for adjusting quiescent current

  • US 6,046,642 A
  • Filed: 09/08/1998
  • Issued: 04/04/2000
  • Est. Priority Date: 09/08/1998
  • Status: Expired due to Term
First Claim
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1. An amplifier with active bias compensation, comprising:

  • a first amplification element having a bias terminal, and a current supply terminal coupled to a first voltage supply conductor via a sensing resistor;

    an active bias compensation circuit having a first input and a second input coupled across the sensing resistor for sensing a quiescent current in the first amplification element, and an output coupled to the bias terminal of the first amplification element, wherein the active bias compensation circuit includes;

    a first transistor having a control electrode coupled to the first input of the active bias compensation circuit, a first current conducting electrode, and a second current conducting electrode;

    a second transistor having a control electrode coupled for receiving a reference voltage, a first current conducting electrode coupled to the first current conducting electrode of the first transistor, and a second current conducting electrode coupled to the output of the active bias compensation circuit;

    a first resistor having a first electrode coupled to a first voltage supply conductor and a second electrode coupled to the first current conducting electrode of the first transistor; and

    a second resistor having a first electrode coupled to the second current conducting electrode of the first transistor and a second electrode coupled to the second input of the active bias compensation circuit; and

    a second amplification element having a quiescent current tracking the quiescent current in the first amplification element.

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