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Taming nonlinear transmission lines. (elimination of reflections on transmission lines)

EDN,  November, 1997  by Mancini, Ron

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It was 1967. The air in the RCA computer systems' circuits lab was electric with excitement. The circuits group had recommended a new saturated-logic IC - TTL - and was about to test it. The air of excitement soon turned into a cloud of despair, however, when the TTL would not drive moderately short lines without multiple pulsing.

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Necessity being the mother of invention, the group solved the problem by adding a diode from the input of the gate to ground. The diode clamped the negative edge to a diode drop below ground, thus preventing the transmission line from ringing back into the ...

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