Patent ID: 8604859

Claim:
A DC-offset correction circuit for a target circuit, the target circuit comprising an output terminal and a feedback input terminal, the DC-offset correction circuit connected between the output terminal and the feedback input terminal, and the DC-offset correction circuit comprising: an obtaining module configured for obtaining a DC-offset voltage from the output terminal; a correction module connected between the output terminal and the feedback input terminal for determining whether the DC-offset voltage is equal to the voltage of the feedback input terminal or not, and comprising: a first charging switch; a first inductor connected to the first charging switch in order from the output terminal to the feedback input terminal; a first charging capacitor connected between ground and the node of the feedback input terminal and the first charging switch; wherein when the voltage of the feedback input terminal is less than the DC-offset voltage, the correction module closes the first charging switch; when the voltage of the feedback input terminal is equal to the DC-offset voltage, the correction module opens the first charging switch.