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Noise margin analysis of a differential circuit

Hello,

Is there any option in Cadence Virtuoso to find the noise margin (NM)? I am trying to find the noise margin of a differential circuit (differential amplifier). As of now, I am trying to find it through the VTC curve using the similar method of finding NM of CMOS inverter. But I am not sure what is the correct way of doing this.

FYI I am using Virtuoso 6.1.6-64b.

Thank you for your time and help!

-Sazjad

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