Have you ever looked into INA116 ? This may safe you from quite a hazel.

www.burr-brown.com

Friedel

At 10:30 p.m. 23/12/01 +0200, you wrote:
>Hi all,
>
>I am looking for an electrometer opamp. I have looked at LMC6001, AD549,
>OPA129 and a few other choices (including discrete JFET input and some
>input current compensation schemes with 'normal' opamps) , but I'd like to
>know opinions from people who have used them really. The device to be
>measured is an experimental capacitive sensor with ~5 pF of capacitance. I
>want to measure charge on it. This amp is to be a buffer between the
>sensor and other measuring equipment.
>
>Any pointers are welcome. The amp should be compensated for unity gain.
>Single rail psu capability and including V- in CMR is an advantage.
>LMC6001 does this.
>
>tia,
>
>Peter
>
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