Hmmm... I like the look of the AD 8307 as a frequency counter input stage.
It could be just what I need.

N

On 10/26/05, Neil Baylis <neil.baylis@gmail.com> wrote:
>
> 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 design 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
> perhaps 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 t=
wo
> 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 shou=
ld
> be OK. Would I be best looking for some kind of limiter IC to use?
>
> Neil
>
> --
> http://www.pixpopuli.com




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