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