Transmission circuit.

摘要

In the transmission circuit, part of the output signal of the transmission circuit is derived by an output monitor circuit (12), and, after being subjected to envelope detection by an output detector circuit (13), the output signal of the output detector circuit is inputted to a peak hold circuit (14) successively holding the peaks of the input signal, so that varying amplitude components are removed, and a DC value is detected. An error detector circuit (15) compares the detected value with a reference signal generated from a reference signal generator circuit (16), and the error signal is used as a gain control signal to control the gain of a power amplifier circuit (11). <MATH>