Amplifier, transmission device, and amplifier control method
First Claim
1. An amplifier comprising:
- 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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Accused Products
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.
55 Citations
6 Claims
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1. An amplifier comprising:
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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. - View Dependent Claims (2, 3, 4)
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5. A transmission device comprising:
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a transmission signal generating unit that generates a transmission signal; an envelope detection unit that detects an envelope of the transmission signal; a comparing unit that compares a voltage of the envelope with a reference voltage; a selecting unit that selects, from among a plurality of amplifying elements each having different operating power and in accordance with a comparison result obtained by the comparing unit, an amplifying element that amplifies the transmission signal; 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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6. An amplifier control method that is executed by an amplifier, the amplifier control method comprising:
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detecting an envelope of a transmission signal; comparing a voltage of the envelope with a reference voltage; selecting, in accordance with a comparison result at the comparing, an amplifying element that amplifies the transmission signal from among a plurality of amplifying elements each having different operating power; controlling, in accordance with the envelope, a voltage that is used to amplify the transmission signal in the amplifying element selected at the selecting; measuring a current of a power supply that supplies the voltage that is controlled at the controlling; and controlling the reference voltage such that the current measured at the measuring decreases.
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Specification