AMPLIFICATION DEVICE AND WIRELESS TRANSMISSION DEVICE PROVIDED WITH SAME, AND GAIN ADJUSTING METHOD FOR AMPLIFICATION DEVICE

摘要

An object of the present invention is to provide an amplifier apparatus 1 in which even if a gain of a returning analog circuit 4 fluctuates, the fluctuation in the gain can be corrected, making it possible to accurately perform a distortion compensation process by a DPD 20. The present invention relates to an amplifier apparatus 1 including an amplifier 11 and a digital pre-distorter (DPD) 20 that performs a distortion compensation process of the amplifier 11. The amplifier apparatus 1 includes a transmitting analog circuit 3 including the amplifier 11; a returning analog circuit 4 including an attenuator 15; a power measurement circuit 16 that measures output power of the amplifier 11; and an amount-of-change calculating unit 27 that calculates an amount of change Grx in a gain Grx of the returning analog circuit 4, based on a measured value of the power measurement circuit 16.