Patent ID: 7323914
Filing Date: 2008-01-29
Classification: H02M

Abstract:
1. A charge pump circuit, comprising: a synchronizing separation circuit that separates a synchronizing signal from a composite signal including a video signal and the synchronizing signal, wherein the synchronizing separation circuit comprises a filter to remove a high-frequency component from the composite signal and a slicing circuit that slices the filtered composite signal with a threshold value of a predetermined level, thereby separating the synchronizing signal from the composite signal; and a flip-flop that divides a frequency of the synchronizing signal acquired by the synchronizing separation circuit, thereby obtaining a clock, wherein the clock from the flip-flop is utilized to control a direction of applying a power supply voltage to a capacitor so that charging of the power supply voltage to the capacitor and shifting of the power supply voltage charged in the capacitor are carried out, thereby obtaining a shifted output voltage.