How to simulate ICMR of comparator?

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holddreams

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icmr of comparator

How to simulate ICMR of comparator?

Just like to simulate ICMR of opamp with the negative input connected to output ?
 

icmr comparator

it depond on the kind of comparator.
if the comparator is like a opa, then just like to simulate ICMR of opamp with the negative input connected to output.
 

i use a folded-cascod opamp following with a open drain Nmos ,
Is it right to use unity-gain mode to simulate the ICMR?

THANKS.
 

make sure the input stage in saturation state
 

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