There a few.
PI Physik Instrumente, you can check their web page
MTI Advanced Product Division also makes capacitance sensing system and
sell components like pre-amps. They have a fairly knowledgable tech. rep.
Paul Slazas, 518-785-2389
Quanmin Su
At 10:35 PM 03/23/1999 -0500, you wrote:
>Hi!
>Are there commerical suppliers of capacitance sense ckts (transresistance
>amps) which can sense 10's of fF's (or tenths or nA's)
>
>Thanks
>Madan
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