| 摘要 |
Provided is a high frequency amplifier that can suppress from increasing the circuit size while improving efficiency at the time of low output. A high frequency amplifier according to one aspect of the present invention includes a carrier amplifier 7 that amplifies an input signal, a peak amplifier 8 that amplifies the input signal with a predetermined amplitude or greater among the input signal, an envelope detector 3 that extracts envelope information of the input signal, and a bias control circuit 4 that calculates a calculation voltage to be supplied to the carrier amplifier 7 according to the envelope information, compares the calculation voltage and a threshold, and changes the calculation voltage to be supplied to the carrier amplifier 7.
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