Created by
Created April 02, 2017
Last modified April 10, 2018
Tags amplifier   feedback   instrumentation-amplifier  


Instrumentation amplifier and driven-right-leg feedback circuit for biosignal recording.


Simulation of an instrumentation amplifier measuring a biosignal (simulated as a 200 Hz differential voltage) with an underlying common-mode signal due to capacitive coupling from the mains (at 50 Hz). Voltage divider effect is simulated by mismatching the electrode lead resistances, albeit with exaggerated large lead capacitances (at 5 nF). The instrumentation amplifier is balanced and so CMRR is ideal (infinite). A switch is put in to disconnect the driven-right-leg (DRL) feedback circuit if desired.


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