On 12/08/2010 09:13 PM, Rick Karlquist wrote:
Yes, and thus if you are going to use a comparator or line
receiver (not recommended), then you should use the SLOWEST
one that still works, if you want to optimize jitter.
This is because the noise bandwidth is less.
For optimum result you need to balance the slew-rate gain (essentially
gain of the transition slew-rate) and the amount of added noise. You
need a certain amount of bandwidth for a certain amount of output
slew-rate, but higher bandwidth also gives more noise. A multi-stage
setup use moderate gain and bandwidth in the initial stages, but it
increases down the line.
A few links:
http://www.ko4bb.com/~bruce/CLKSHPR.html
http://www.ko4bb.com/~bruce/ZeroCrossingDetectors.html
As for transformer isolation, for most uses I find it fairly useless,
but an RF-choke to isolate the front-end and the electronics RF-wise in
common mode sense is more useful IMHO.
Cheers,
Magnus
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