POWER AMPLIFICATION MODULE
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United States of America Patent
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Issued Date -
Dec 22, 2016
app pub date -
May 26, 2016
filing date -
Jun 16, 2015
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Abstract
A power amplification module includes: first to fourth differential amplifiers; first to fourth input windings that are respectively connected to differential outputs of the first to fourth differential amplifiers; first to fourth output windings that are respectively electromagnetic-field coupled with the first to fourth input windings; and a bias circuit that controls supply of a bias voltage on the basis of a mode signal. The first to fourth output windings are connected in series with each other. The winding ratio between each input winding and output winding is 2:1. The bias circuit supplies a bias voltage to the first to third differential amplifiers and halts supply of the bias voltage to the fourth differential amplifier in a case of an envelope tracking scheme. The bias circuit supplies the bias voltage to the first to fourth differential amplifiers in a case of an average power tracking scheme.
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