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Understanding two Multivibrator models

imrankhanPNU

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Hello,
I simulated the two multivibrator models in CMOS technology using the cadence tool. I was expecting the model 2 with Schmitt trigger(ST) will show robustness in PVT (Process Voltage temperature) analysis as compared to model 1 due to ST. But this was not the case both the Models shows the same response to PVT variation analysis means their outputs were stable under varying PVT conditions. Could anyone address my queries:

  1. Is Schmitt trigger in Model 2 having an edge over model 1?
Thanks.
 

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FvM

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Similar PVT sensitivity can be expected because ST gate threshold depends on same CMOS parameters as non-ST NAND gate threshold.
 

danadakk

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Specs in datasheet show large variations in trip levels vs T and V

1614950381851.png


Regards, Dana.
 

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