Output buffer to drive AC-coupled terminated transmission lines
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United States of America Patent
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Issued Date -
Oct 25, 2007
app pub date -
Apr 24, 2006
filing date -
Apr 24, 2006
priority date (Note) -
Abandoned
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Abstract
An output buffer for driving an AC-coupled resistively terminated transmission line comprises at least first and second drive circuits coupled to an input signal and providing respective drive signals that transition in response to respective transitions of the input signal. The buffer is arranged such that, in response to a given input signal transition, the second drive signal transitions a predetermined amount of time after the first drive signal. The first and second drive signals are summed together to provide the buffer's output signal. The drive circuits are arranged such that the output signal has a first slew rate prior to the transition of the second drive signal, and a second, faster slew rate during the transition of the second drive signal, such that the slew rates reduce ringing that might otherwise occur on the transmission line.
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