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SYSTEMS, CIRCUITS AND METHODS RELATED TO MULTI-MODE POWER AMPLIFIERS HAVING IMPROVED LINEARITY

  • US 20150162877A1
  • Filed: 11/03/2014
  • Published: 06/11/2015
  • Est. Priority Date: 11/07/2013
  • Status: Active Grant
First Claim
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1. A power-amplifier (PA) comprising:

  • a PA circuit that includes a bipolar junction transistor (BJT) having a base, a collector and an emitter, the BJT configured to receive a radio-frequency (RF) signal through an input path and amplify the RF signal;

    a biasing circuit in communication with the PA circuit, the biasing circuit configured to provide a first bias signal or a second bias signal to the PA circuit for operation in a first mode or a second mode, respectively, each of the first bias signal and the second bias signal routed to the BJT through a path that includes a common node and a ballast; and

    a linearizing circuit implemented between the common node and a node along the input path, the linearizing circuit configured to provide a coupling path between the common node and the input path to improve linearity of the PA circuit operating in the first mode while allowing the ballast to be sufficiently robust for the PA circuit operating in the second mode.

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