[time-nuts] Reverse isolation

Didier didier at cox.net
Sun Mar 8 22:14:44 UTC 2009

This question is directed at Bruce, but if anyone else has a contribution,
feel free to speak.


What is the best way to measure the reverse isolation of an amplifier
(particularly a buffer amplifier for a 10 MHz reference), when it is
expected to be in the order of 100 dB or more?

Feeding the output with a known signal and measuring at the input with a
spectrum analyzer comes to mind, but I am sure there must be something wrong
with that technique, it sounds too simple.

The presence of a signal at the input (or not) may affect the operating
point of the amplifier, so measuring from output to input without such
signal may not give a true result. 


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