Amplification Circuit, Communication Device, and Transmission Device Using Amplification Circuit

Abstract

Provided are an amplification circuit capable of amplifying an input signal having a changing duty ratio with high efficiency, and a transmission device and a communication device using the amplification circuit. The amplification circuit includes: a transistor circuit (10) having a pulse wave first signal having a changing duty ratio input, and a second signal obtained by amplifying the pulse wave first signal output; and a matching circuit (20) having the second signal input and a third signal having a fundamental frequency of the pulse wave first signal output. An impedance of the matching circuit (20) as seen from the transistor circuit side changes in accordance with the duty ratio of the pulse wave first signal. The transmission device and the communication device each use the amplification circuit.

Dependencies are inferred from the claim text.