Patent ID: 9209769
Filing Date: 2015-12-08
Classification: H03F,H03G

Abstract:
1. A power amplifier, comprising: a first amplifier circuit and a second amplifier circuit that are controlled so that one of the first and the second amplifier circuits does not amplify a signal when another one of the first and the second amplifier circuits amplifies the signal, the another one configured to amplify the signal and to output the amplified signal from a common output terminal; a first impedance conversion circuit that is coupled between the first amplifier circuit and the output terminal, and is configured to convert an output impedance of the first amplifier circuit; a second impedance conversion circuit that is coupled between the second amplifier circuit and a wiring coupling the first impedance conversion circuit and the output terminal, and is configured to convert an output impedance of the second amplifier circuit; and a connection circuit that, when the first amplifier circuit amplifies the signal, forms a path which bypasses the second impedance conversion circuit between a reference potential and the wiring coupling the first impedance conversion circuit and the output terminal, by coupling a wiring coupling the first amplifier circuit and the output terminal, with the reference potential.