This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

leakage current in bio-impedance measurement

Other Parts Discussed in Thread: OPA657, LMH6629

Hello

I'm designing a TIA with LMH6629 or OPA657.

but I have concern about it.

I think there is a  leakage current when I inject a current from point A and want to measure it from point B with the TIA.

actually in literature or other devices they usually place a guard ring around the sense probe to  prevent the  leakage current.

but if I place the guard ring around the sense probe when this probe touches the skin, a parasitic capacitance will be created between the sense probe and the ring :)

what should I do?

Regards