Mobile communication apparatus with linear power control over wide dynamic range.

摘要

A mobile communication apparatus is provided, in which the linearity during a small output power of a radio-frequency power amplifier can be maintained as during a large output power. The input signal power to a radio-frequency power amplifier (11) is decreased by an attenuator (32) during a small power output. The resulting downward trend of the transmission signal power is compensated for by increasing the gain of the radio-frequency amplifier circuit (11) through a transmission power control circuit (14). Under this condition, the radio-frequency power amplifier (11) is made operable in a linear region of the transistor in the same manner as during a large power output. As a result, the linearity of the amplifier is guaranteed over the whole operating range of the transmission power.