Patent ID: 9647614
Date: 2017-05-09
CPC Classifications: H03F

Claim:
1. A power amplifier comprising: a class D amplification section that includes an input section and a switching section serving as an output stage and switched depending on a signal input to the input section, and that outputs current from a power source to a load via the switching section; a load current feedback circuit that feeds back a current flowing in the load to a negative terminal of the input section of the class D amplification section; and a filter current feedback circuit that feeds back a current flowing in a filter to the negative terminal of the input section of the class D amplification section; wherein the filter is interposed between the output stage of the class D amplification section and the load; wherein the filter comprises an inductor and a capacitor; wherein the inductor is inserted between an output terminal of the output stage and the load so as to be connected in series to the output stage and the load; and wherein one terminal of the capacitor is connected to a node between the inductor and the load.