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Stretching the cable

Differential signalling for analogue video. By Bill Stutz, Jurica Ivisic and Miles Bekgran.

Differential signalling should bring many benefits to analogue video – less emi, less distortion, lower supply voltage and lower cost – but most applications continue to use single ended 75W coax connections.
An impediment to implementing differential analogue video has been the absence of a low cost ic that converts, transmits and receives video over a differential cable. With such parts now available, let’s look at a typical application: sending video over several hundred metres of CAT5 cable.
Although a differential circuit looks complex, it’s simply two single ended (SE) circuits configured to produce equal and opposite signals with respect to a common point.

Author
Bill Stutz, Jurica Ivisic and Miles Bekgran

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12216\Stretching.pdf

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