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Regulated cascode amplifier with controlled saturation

  • US 6,965,270 B1
  • Filed: 12/18/2003
  • Issued: 11/15/2005
  • Est. Priority Date: 12/18/2003
  • Status: Active Grant
First Claim
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1. An amplifier connected between first and second power supply terminals, the amplifier comprising:

  • a. an amplifier input terminal;

    b. an amplifier output terminal;

    c. a feedback amplifier havingi. a bias terminal receiving a first bias voltage;

    ii. first and second feedback terminals; and

    iii. a feedback-amplifier terminal;

    d. a cascode circuit including;

    i. an input transistor having a first current-carrying terminal connected to the first feedback terminal, a second current-carrying terminal connected to the second supply terminal, and a control terminal connected to the amplifier input terminal; and

    ii. a output transistor having a first current-carrying terminal connected to the amplifier output terminal, a second current-carrying terminal connected to the first feedback terminal, and a control terminal connected to the second feedback terminal; and

    e. a booster circuit connected between the feedback-amplifier terminal and the second power supply terminal, the booster circuit configured to generate a booster voltage on the feedback-amplifier terminal sufficient to bias the input transistor in a saturation mode.

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