Hello,
I have to get the *exact* timing (30ns resolution) of some low frequency (<=
250Hz) pulses
via an input capture module, however I'd like to filter the signal coming i=
n, as it will
contain a lot of high frequency noise, but filtering via a capacitor introd=
uces a phase
delay, which I can't even compensate (by frequency) as the phase delay chan=
ges with input
signal amplitude.

What is the way You'd approach this problem? I thought about using a zener =
to clip the
signal and thus work on a known amplitude, but I suspect it will introduce =
errors too.

On the software side, I could make sure that the input stays high for enoug=
h time, but
it's pretty overkill, and I'd like to keep it as last option. If it could b=
e done [EE]
then it would be better!

With kind regards,
Mario

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