High-frequency signal amplifier circuit, power amplifier module, front-end circuit, and communication apparatus

A high-frequency signal amplifier circuit that is used in a front-end circuit that is configured to propagate a high-frequency transmission signal and a high-frequency reception signal, comprising:

• an amplifier transistor configured to amplify the high-frequency transmission signal;
• a bias circuit having an output end that supplies a bias to a signal input terminal of the amplifier transistor;
• and
• a ferrite bead,
• wherein a first end of the ferrite bead is connected to the output end of the bias circuit and a second end of the ferrite bead is connected to the signal input terminal of the amplifier transistor, and
• wherein an impedance of the ferrite bead in a difference frequency band between the high-frequency transmission signal and the high-frequency reception signal is higher than a direct current (DC) impedance of the ferrite bead.