Printed circuit board
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United States of America Patent
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Apr 23, 2013
Grant Date -
Apr 19, 2012
app pub date -
Oct 5, 2011
filing date -
Oct 19, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
One end of a sub transmission line of which an impedance value is equal to or higher than a parallel impedance value of an output impedance value of a transmission circuit and an impedance value of a transmission line is connected to a connection point between the transmission circuit and the transmission line, and a correction resistor of which resistance is lower than an impedance value of the sub transmission line is connected to the other end of the sub transmission line. A length of the sub transmission line is set to satisfy a condition of 0.5×Tr (signal rise time)≦Td (signal propagation time of sub transmission line)≦0.5×Tmin (signal minimum pulse width), thereby achieving a de-emphasis function by a passive component, correcting a high-frequency component of a signal attenuated on the transmission line, and thus reducing timing jitters caused by intersymbol interference.
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