Patent ID: 8207790

Claim:
A high frequency power amplifier comprising: first and second transistors which are connected in parallel to each other and which amplify a high frequency signal input from outside; a first switch which includes an input terminal connected to outputs of the first and second transistors, a first output terminal, and a second output terminal, the first switch selectively connecting the input terminal of the first switch to the first output terminal of the first switch and the second output terminal of the first switch; a third transistor which amplifies a signal output from the first output terminal of the first switch; and a second switch which includes first input terminal connected to an output of the third transistor, a second input terminal connected to the second output terminal of the first switch, and an output terminal, the second switch selectively connecting the first input terminal of the second switch and the second input terminal of the second switch to the output terminal of the second switch, wherein output power of the first transistor is larger than output power of the second transistor, and operating efficiency of the first transistor is lower than operating efficiency of the second transistor.