Bias circuit and power amplifier circuit
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United States of America Patent
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May 26, 2020
Grant Date -
Jun 27, 2019
app pub date -
Jun 21, 2018
filing date -
Dec 22, 2017
priority date (Note) -
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Abstract
A power amplifier circuit includes a bias circuit and an amplifier circuit. The bias circuit includes a first bias circuit to receive a reference voltage and an operation voltage and generate a first bias signal, a bias supply circuit to transmit the base bias signal to a base of a power amplifier, based on the first bias signal input from the first bias circuit, a switching control circuit to transmit a switching signal after a preset delay time based on a driving start signal, and a switching circuit connected between an output node of the first bias circuit and a ground, to operate in an ON state after the delay time in response to the switching signal to form a current path between the output node of the first bias circuit and the ground.
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