Amplifier, transmission device, and amplifier control method
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United States of America Patent
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Jul 23, 2013
Grant Date -
Nov 22, 2012
app pub date -
Mar 15, 2012
filing date -
May 16, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
An amplifier includes an envelope detection unit that detects an envelope of a transmission signal; a comparing unit that compares a voltage of the envelope with a reference voltage; a selecting unit that selects, in accordance with a comparison result obtained by the comparing unit, an amplifying element that amplifies the transmission signal from among a plurality of amplifying elements each having different operating power; a voltage control unit that controls, in accordance with the envelope, a voltage that is used to amplify the transmission signal in the amplifying element that is selected by the selecting unit; a current measuring unit that measures a current of a power supply that supplies the voltage that is controlled by the voltage control unit; and a reference voltage control unit that controls the reference voltage such that the current measured by the current measuring unit decreases.
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