AMPLIFIER APPARATUS

摘要

A power supply voltage control part (200) includes an adder (11) for adding a baseband amplitude-modulated signal (101) and a negative feedback signal together; an integrator (12) for integrating an output from the adder (11); a quantizer (13) for quantizing an output from the integrator (12); and a low-pass filter (14) for removing quantized noise from an output supplied form the quantizer (13). In addition to them, the power supply voltage control part (200) further includes a compensator (15) having an inverse characteristic to the low-pass filter (14) or a characteristic obtained by approximating it for compensating for the feedback amount of the negative feedback signal.