AMPLIFICATION DEVICE AND RADIO COMMUNICATION APPARATUS EQUIPPED WITH AMPLIFICATION DEVICE

摘要

An amplification transistor has a collector to which a voltage converted by a DC/DC converter is supplied. An output voltage of the DC/DC converter is determined based on an input impedance of a rear-stage circuit block. For example, a voltage of the DC/DC converter is set such that an output waveform of an amplifier circuit becomes appropriate for the input impedance of the rear-stage circuit block (generally 50 [Ω]) in a targeted modulation scheme (mode) or frequency (band) to be used, without having to use an output matching circuit.

主权项

1. An amplification device comprising:
a power amplifier configured to receive electric power at an output side, use the received electric power to amplify electric power, and output the amplified electric power; and a variable voltage circuit configured to convert a voltage supplied from a power supply and supply the converted voltage to the output side of said power amplifier, an output voltage of said variable voltage circuit being determined based on an impedance of a device connected to the output side of said power amplifier.