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Hi,

for me it is still unclear why you are limited to an amplitude of 500 mV, as well as why have you selected 100 Hz and 1 kHz as excitation frequency.

Which kind of nature is your DUT, e.g. tissue? Does it have caracteristic properties at 100 Hz and 1 kHz, is that the reason you have chosen this two ferquencies?

The sketch provided by you looks like an capacitively coupled sensor system to me. Is it a PCB based planar meander/interdigitate sensor? If so, it has a capacitve nature and increasing the excitation frequency will lower the impedance.

Br