|Created||April 02, 2017|
|Last modified||April 03, 2017|
|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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