Among many projects, I'm working on a frequency counter design using a PIC.
I'm going to be counting up to 100 MHz, and I need to build an appropriate
input stage. I want to build an input stage that has a BNC connector so I
can plug a scope probe into it. Can anyone point me at a scope preamp desig=
n
of some kind? It needs to pass 100 MHz, and provide limiting.

I guess I want it to work with inputs well under one volt, and up to perhap=
s
10 Volts. I don't need it to respond down to DC.. I'll have a separate DC
coupled input for that. I was imagining some kind of one or two transistor
design, maybe with a fet input. It doesn't have to be super accurate.. as
long as it provides some gain to clean up the edges it should be OK. Would =
I
be best looking for some kind of limiter IC to use?

Neil

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