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The reason why you are getting an offset voltage on the output of the AD623 is that the PNP transistors on input of the instrumentation amplifier do not have a path for the input bias current to flow, which results in an offset voltage at the output.
lladnar23 is right. You could just bridge...
harmonic distortion in spice
Accurate simulation of harmonic distortion in SPICE is not a trivial task. Most op-amp models from manufacturers are not designed for accuracy in non-linear transient analysis (i.e. the simulation step preceding taking the FFT). Op-amp models are designed to, at...
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