Hi,
I have a circuit for measuring ECG and it is working perfect for one channel. I have one passive high pass filter (R1,C1) and one passive low pass filter (R2,C2) before the instrumentation amplifier. I am using only two electrodes, without RLD.
Now I want to have two channels with three electrodes, one as reference which is shared between two instrumentation amplifiers. What should I consider for sharing this reference electrode for two instrumentation amplifiers to keep the matching as good as before. Assuming that I have the same filter circuit as before with R1,C1,R2,C2 for reference electrode what changes should I make in the values of these components?
Regards