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Apparatus and methods for power amplifier bias circuits

  • US 9,608,576 B2
  • Filed: 05/02/2016
  • Issued: 03/28/2017
  • Est. Priority Date: 08/01/2013
  • Status: Active Grant
First Claim
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1. A power amplifier system comprising:

  • a power amplifier stage configured to receive a bias voltage that biases the power amplifier stage;

    a current source configured to generate a reference current;

    a plurality of reference bipolar transistors;

    a selection circuit configured to select one or more selected reference bipolar transistors from the plurality of reference bipolar transistors, the one or more selected reference bipolar transistors having a current therethrough that changes in relation to the bias voltage; and

    a transimpedance amplifier configured to control the bias voltage based on an error current corresponding to a difference between the reference current and the current through the one or more selected reference bipolar transistors.

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