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Smart linearized power amplifier and related systems and methods

  • US 7,863,983 B2
  • Filed: 05/19/2004
  • Issued: 01/04/2011
  • Est. Priority Date: 05/20/2003
  • Status: Active Grant
First Claim
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1. A power amplifier subsystem, comprising:

  • a first stage amplifier and a second stage amplifier, the first and second stage amplifiers each having an input;

    a first bias circuit coupled to the input of the first stage amplifier, the first bias circuit including;

    a first transistor having an emitter and collector,a second transistor having an emitter and collector, anda plurality of resistors,and wherein the emitter of the second transistor is coupled to a resistor to ground, the base of the second transistor and the emitter of the first transistor are coupled together and coupled to a resistor to ground, and to the input of the first stage amplifier through a resistor; and

    a second bias circuit coupled to the second stage amplifier;

    wherein the collector of the first transistor is coupled to a bias control voltage.

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