In SX Microcontrollers, SX/B Compiler and SX-Key Tool, phipi wrote:

Peter,

Most devices that receive video signals have a DC-restorer (clamp) after their AC coupling stage, which firmly plants the sync tips at a known level. This is necessary for the very reason you mention: that the average DC level depends on the video content — but regardless of how its driven. The main benefit from the driver is presenting a constant impedance to the transmission line.

-Phil

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