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电子发烧友网>电子资料下载>电源技术>Transmission lines and termina

Transmission lines and termina

2009-03-30 | rar | 444 | 次下载 | 3积分

资料介绍

With increasing systems speeds and faster logic families,
interconnect characteristics have become significant. The signal
transition times of faster families can increase transmission line
effects on printed circuit board traces and cables. If not taken into
consideration, signal degradation can cause data errors in a system.
Previous logic families with slower rise and fall times such as LS
and HCMOS were not as severely affected by this issue if line
lengths were not too long. For example, an HCMOS buffer with a 5
ns edge will start exhibiting transmission line effects when a circuit
board trace is longer than a foot. However, with newer families, even
relatively short trace lengths become very important. This
application note will briefly review transmission line concepts and
evaluate transmission line effects with Philips 5 volt and 3 volt
BiCMOS and CMOS logic families such as ABT, AC(T), ALVC, LVC,
LVT, and ALVT.
For more detailed information on transmission lines, there are many
other resources to refer to. The terms line or transmission line will
refer to a cable or printed circuit trace medium and will be regarded
as equivalent for electrical purposes, though their construction
varies in real applications.
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