Semiconductor integrated circuit for high frequency power amplifier, electronic component for high frequency power amplifier, and radio communication system

A semiconductor integrated circuit device for wireless communication system, comprising:

• an input terminal which receives an input signal to be amplified;
• an output terminal which outputs an output signal to be transmitted;
• a high frequency power amplifier which is coupled between the input terminal and the output terminal and which has a plurality of amplifying stages;
• a power detector which receives a first signal from the high frequency power amplifier in connection with the output signal, and outputs a detection signal;
• a converter which receives the detection signal and converts the detection signal into a second signal;
• a first amplifier which receives the voltage and an output power instruction signal and outputs a third signal;
• and
• a bias generator which receives the third signal and supplies bias to each of the amplifying stages,
• wherein the first amplifier includes a differential amplifier which has an inverting input terminal, a non-inverting input terminal and a first terminal, and a low pass filter which is arranged between the first terminal and the inverting input terminal, and
• wherein the inverting input terminal receives the second signal, the non-inverting input terminal receives the output power instruction signal and the first terminal outputs the third signal.