Application Note 57
January 1994
Video Circuit Collection
Jon Munson and Frank Cox
INTRODUCTION
Even in a time of rapidly advancing digital image processing, analog video signal processing still remains eminently
viable. The video A/D converters need a supply of properly
amplified, limited, DC restored, clamped, clipped, contoured, multiplexed, faded and filtered analog video before
they can accomplish anything. After the digital magic is
performed, there is usually more amplifying and п¬Ѓltering
to do as an adjunct to the D/A conversion process, not to mention all those pesky cables to drive. The analog way
is often the most expedient and efficient, and you don’t
have to write all that code.
The foregoing is only partly in jest. The experienced engineer
will use whatever method will properly get the job done;
analog, digital or magic (more realistically, a combination
of all three). Presented here is a collection of analog video
circuits that have proven themselves useful. CIRCUIT INDEX
I. Video Amplifier Selection Guide . 2 II. Video Cable Drivers . 3
AC-Coupled Video Drivers . 3
DC-Coupled Video Drivers . 4
Clamped AC-Input Video Cable Driver . 5
Twisted-Pair Video Driver and Receiver . 5 III. Video Processing Circuits . 6 …