Bias circuit and amplifier
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United States of America Patent
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Nov 3, 2020
Grant Date -
Jun 11, 2020
app pub date -
Jun 5, 2019
filing date -
Dec 11, 2018
priority date (Note) -
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Abstract
A bias circuit includes a bias current circuit varying a resistance value according to a mode voltage determined according to a magnitude of an input radio frequency signal, and generating a bias current that is controlled according to the variation of the resistance value; a bias voltage circuit generating a bias voltage that is adjusted according to a change in a power source voltage and supplying the bias voltage to an amplifying circuit; and a bias transfer circuit supplying the bias current to a base node of the amplifying circuit and blocking an input of the radio frequency signal from the base node.
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