Patent ID: 9148091
Filing Date: 2015-09-29
Classification: H03F

Abstract:
1. An amplifier comprising: a first amplifier circuit unit configured to output a signal having a maximum output power of the amplifier; and a second amplifier circuit unit provided in parallel with the first amplifier circuit unit between an input and an output of the amplifier and having a higher amplification efficiency than the first amplifier circuit unit in an output power lower than an output power of the first amplifier circuit unit, wherein, when one of the first amplifier circuit unit and the second amplifier circuit unit is in an operating state in which power amplification of a signal is performed, the other of the first amplifier circuit unit and the second amplifier circuit unit is in a non-operating state in which power amplification of the signal is not performed, wherein the first amplifier circuit unit includes: wherein the second amplifier circuit unit includes: