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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