Voltage level control circuit and associated method

摘要

A voltage level control circuit controls a target slicing voltage level to slice a video signal by a target circuit. The voltage level control circuit includes a slicing circuit for sequentially slicing the video signal by a plurality of slicing voltage levels to correspondingly generate a plurality of first clock signals; a detection circuit for respectively detecting a plurality of phase differences between the first clock signals and a plurality of corresponding second clock signals to generate a plurality of detection signals; an oscillating circuit for generating the second clock signals according to the detection signals, respectively; and an adjusting circuit for determining whether to adjust the target slicing voltage level according to the detection signals corresponding to the slicing voltage levels.

主权项

1. A voltage level control circuit, for controlling a target slicing voltage level used to slice a video signal by a target circuit, the voltage level control circuit comprising:
a slicing circuit, for slicing the video signal by sequentially adopting a plurality of slicing voltage levels to correspondingly generate a plurality of first clock signals; a detection circuit, for respectively detecting a plurality of phase differences between the first clock signals and a plurality of second clock signals to generate a plurality of detection signals; an oscillating circuit, for generating the second clock signals according to the detection signals, respectively; and an adjusting circuit, determining whether to adjust the target slicing voltage level according to the detection signals corresponding to the slicing voltage levels, wherein the video signal is a composite video blanking sync signal, and wherein the target slicing voltage level is for slicing horizontal synchronization signal components of the composite video blanking sync signal.