Bias circuitry for power amplifiers
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United States of America Patent
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Oct 24, 2017
Grant Date -
Apr 21, 2016
app pub date -
Oct 1, 2015
filing date -
Oct 21, 2014
priority date (Note) -
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Abstract
Circuits and methods related to power amplifiers. In some implementations, a bias circuit includes a reference device connectable to receive a first electrical supply level, the reference device arranged to produce an electrical bias condition using the first electrical supply level, and the reference device connectable to provide the electrical bias condition to an amplifier device connectable to a second electrical supply level. The bias circuit also includes a differential amplifier connectable to receive the first electrical supply level, the differential amplifier having a first input connectable to a first node of the reference device and a second input connectable to receive a reference electrical level, the differential amplifier arranged to maintain a first electrical level on the first node of the reference device as a function of the reference electrical level.
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