Importance

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Abstract

A bias power supply circuit operates in one of a plurality of current generation modes generating bias power source currents of different levels. The bias power source current is reduced where a first detection signal indicates that a power source voltage is less than a first threshold value. Under control of a bias control circuit, a bias circuit operates in one of an on mode and an off mode wherein the on mode is a mode in which the bias power source current generated by the bias power supply circuit is supplied to a power amplifying transistor as a bias current, and the off mode is a mode in which the bias current whose level is reduced compared with a case where the bias circuit operates in the on mode is supplied or supply of the bias current is stopped.

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First Claim