Patent ID: 9647612
Date: 2017-05-09
CPC Classifications: H03F

Claim:
1. A power amplifying apparatus comprising: an amplifier configured to amplify an input signal and supply a load with the amplified input signal; a demodulating circuit including a coil connected in series with an output stage of the amplifier and a capacitor connected in parallel between an output side of the coil and ground, and configured to demodulate the input signal from the amplifier and output the demodulated signal as an output signal; a current detecting circuit, disposed at an output stage of the demodulating circuit, configured to detect a current of the output signal from the demodulating circuit; a current feedback circuit configured to provide feedback of the detected current of a certain feedback amount; a voltage feedback circuit configured to provide feedback of a voltage of the output signal of a certain feedback amount; an adjuster configured to adjust the input signal using the feedback current and the feedback voltage; and a modulating circuit configured to digitally modulate the input signal and supply the amplifier with the digitally modulated signal.