Patent ID: 8508299
Filing Date: 2013-08-13
Classification: H03F

Abstract:
1. A high-frequency power amplifier comprising: a first terminal where a first power signal is input; a second terminal where a second power signal is output, the second power signal being generated by amplifying the first power signal; a first impedance matching circuit provided between the second terminal and a first node; and a first signal path and a second signal path that provide signal transmission paths from the first terminal to the first node and are switchable in accordance with a power specification signal capable of setting power levels of the second power signal, wherein the first signal path includes: a plurality of stages of power amplification transistors including a first power amplification transistor as a last stage; and a plurality of impedance matching circuits including a second impedance matching circuit provided between an output node for the first power amplification transistor and the first node, wherein the second signal path includes: a plurality of stages of power amplification transistors including a second power amplification transistor as a last stage; and a plurality of impedance matching circuits including a third impedance matching circuit provided between an output node for the second power amplification transistor and the first node, wherein the number of stages of the power amplification transistors on the first signal path is equal to the number of stages of the power amplification transistors on the second signal path, and wherein the number of the impedance matching circuits on the first signal path is equal to the number of the impedance matching circuits on the second signal path.