Power amplification circuit and power amplification module

摘要

It is possible to increase linearity in a power amplification circuit. A power amplification circuit includes a first amplification element which amplifies and outputs an input signal with a gain according to the level of the input signal and the level of a bias voltage, a second amplification element which has the same gain characteristic as the first amplification element and amplifies and outputs the input signal, and a variable bias voltage generation circuit which generates a bias voltage decreasing with an increase in level of an output signal of the second amplification element.

主权项

1. A power amplification circuit comprising:
a first amplification element which amplifies and outputs an input signal with a gain according to a level of the input signal and a level of a bias voltage; a second amplification element which has the same gain characteristic as the first amplification element and amplifies and outputs the input signal; and a variable bias voltage generation circuit which generates the bias voltage, such that the bias voltage decreases with an increase in level of an output signal of the second amplification element, wherein the variable bias voltage generation circuit includes a filter circuit which attenuates an AC component of an output signal of the second amplification element, and generates the bias voltage based on an output signal of the filter circuit.