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Power amplifier

  • US 8,779,860 B2
  • Filed: 08/15/2012
  • Issued: 07/15/2014
  • Est. Priority Date: 08/15/2012
  • Status: Active Grant
First Claim
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1. A power amplifier, comprising:

  • a common source amplification stage including a common source transistor configured to receive a radio frequency (RF) input signal via a gate of the common source transistor; and

    a first common gate amplification stage connected in cascode between a variable supply voltage source and the common source amplification stage, and configured to amplify an output of the common source amplification stage,wherein the first common gate amplification stage includes;

    a first common gate transistor connected in cascode to the common source transistor; and

    a first gate bias controller configured to generate a first divided voltage based on a variable supply voltage of the variable supply voltage source, to generate a first gate bias voltage by buffering the first divided voltage, and to supply the first gate bias voltage to a gate of the first common gate transistor.

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