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Monte Carlo simulation results have difference even in ideal circuits

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Hi everyone,

I'm now running an analog-to-digital converter project, all the circuits are ideal (vcvs built op-amp, switch, quantizers...) to verify the function.

So if I run MC mismatch using ADE-XL for this ideal circuits, every time I got the same waveforms and final Quantizer output code, this is what I expected.

The problem occurs when I started to put some real circuits in the schematic, for example  just an inverter in standard library (the inverter is not connected to anything, just put in the schematic), and now for MC 

situation the results are different,  some nodes' waveforms now start to have slightly difference, but I don't know where those mismatches come from.


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