What is described is a system for estimating a ripple component of an input signal. The system includes a first module configured to remove a direct current (DC) component from the input signal and output an alternating current (AC) signal that includes the ripple component and a low frequency component of the input signal. The system also includes a second module configured to determine a period and an amplitude of the AC signal and output an estimated ripple signal based on the period and the amplitude of the AC signal.