Madan,
Check out MicroSensors's (www.microsensors.com) Universal Capacitive IC.
It's resolution is .05 fF.

Ying Hsu
MicroSensors

K.V.Madanagopal 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
>