Patent ID: 7940335
Filing Date: 2011-05-10
Classification: H04N

Abstract:
1. A video signal output circuit comprising: a sync-tip clamp circuit fixing a sync-tip level of an input video signal at a constant voltage; a low-pass filter receiving the video signal output from the sync-tip clamp circuit and eliminating a predetermined high-frequency component; a dummy circuit receiving the video signal output from the sync-tip clamp circuit and outputting the video signal having substantially the same sync-tip level as that of the video signal output from the low-pass filter; and an output driver receiving the video signal output from the low-pass filter and outputting the video signal with a low output impedance, wherein said sync-tip clamp circuit controls the sync-tip level of the video signal output from said dummy circuit such that the sync-tip level of the video signal is equal to a predetermined reference voltage.