Single 4-input IC gives over 90dB crosstalk rejection at 10MHz and is expandable
John Wright
Abstract
A single 4-input IC that gives over 90dB crosstalk rejection at 10MHz and is expandable is described.
Keywords
Video design
crosstalk
LT1204 4-input video multiplexer
Introduction
Professional video systems need to multiplex between many signals without interference from adjacent video sources that are not selected. Final system crosstalk rejection of all non-selected or “Hostile” signals of 72dB is regarded as “professional quality.” This level of isolation is very difficult to achieve because every doubling in the number of inputs degrades the crosstalk by 6dB. In the past because no single IC was good enough, cascades ...
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