I am using an AD8421 with a Gain=100 to amplify square wave signals from 5uV to 500uV. Input low pass filter R=470, Cc=10nF, Cd=470nF. Total gain = 10000. Connection between instrumentation amplifier input and probe head is shielded twisted pair.
I notice the difference in pulse response between small and large signals.
What is the reason for overshoot – settling time?