Patent ID: 8901984

Claim:
A direct current (DC) offset correction circuit for a target circuit, the target circuit comprising an output and a feedback input, the DC offset correction circuit connected between the output and the feedback input, and the DC offset correction circuit comprising: an obtaining module obtaining a DC offset voltage from the output of the target circuit; a controller connected to the obtaining module, the controller outputting correction signals in response to the direct current offset voltage being greater than a predetermined voltage; and a correction module connected to the target circuit, the obtaining module and the controller, the correction module compensating the DC offset voltage of the target circuit according to the correction signals; wherein the obtaining module comprises a first obtaining unit and a second obtaining unit, the first obtaining unit is connected to the target circuit and the correction module, the first obtaining unit obtains the DC offset voltage from the output of the target circuit and sends the DC offset voltage to the correction module, the second obtaining unit is connected to the target circuit and the controller, the second obtaining unit obtains the DC offset voltage from the output of the target circuit and sends the DC offset voltage to the controller.