I've made some use schottky terminations. I consider them
crude, but, in some cases, effective. The load reflection
coefficient will change from approximately +1 while the termination
diode is off, to approximately -1 when on. This can cause other
problems which have to be dealt with.
California Micro Devices is a manufacturer of schottky
terminators. They have an application note on this topic.
You can find links to their products, app. notes, and other
references by searching for: "Schottky diode termination"
on Excite, http://www.excite.com/
(See also "Termination Techniques for High Speed Buses" -
published in EDN magazine, February 16, 1998).
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