Patent ID: 6967535

Claim:
A high-frequency power amplifier circuit device formed on a single semiconductor chip, comprising: a first semiconductor power transistor; a first capacitor which is coupled to the first semiconductor power transistor and via which a high frequency signal to be amplified is inputted to the first semiconductor power transistor, a first semiconductor transistor that is arranged so as to form a current mirror circuit with the first semiconductor power transistor and wherein said first semiconductor is a diode connected transistor; a first bias circuit providing a current to the first semiconductor transistor, a second semiconductor power transistor; a second capacitor which is coupled to the second semiconductor power transistor via which a high frequency signal based on an output signal of the first semiconductor power transistor is inputted to the second semiconductor power transistor; a second semiconductor transistor that is arranged so as to form a current mirror circuit with the second semiconductor power transistor; and a second bias circuit providing a current to the second semiconductor transistor.