Patent ID: 8489037

Claim:
A power amplifying apparatus comprising: a bandwidth limitation process circuit that performs a bandwidth limitation process for generating a voltage control signal having a peak point that is coincident with a peak point of an envelope signal, the bandwidth limitation process circuit comprising: a plurality of circuits to each of which the envelope signal included in a transmission signal is inputted in synchronization with a clock signal, and each of which outputs each of a plurality of signals corresponding to the envelope signal in different timing, a plurality of multiplying circuits each of which multiplies an output of each of the plurality of circuits by each of a plurality of window function coefficients, and a selection circuit that selects a maximum value from among multiplying results of the plurality of multiplying circuits, the maximum value being converted to the voltage control signal; a variable power supply circuit for generating a power amplifier supply voltage based on the voltage control signal; and a power amplifier which is fed an input signal, and which is driven in accordance with the power amplifier supply voltage.