how to find offset of an 2-stage opamp

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viran.kambakam

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i am using cadence 0.18um for design.
plz send ans ....
its urgent
 

Which offset: input, output or inout offset? Schematic or extracted layout dataBase?
Note: from a symmetrical differential input schematic, you won't find any input offset.

Output and inout offset is common mode voltage dependent.
For such dependency, use DC analysis and sweep an additional DC offset voltage between the inputs.

On an extracted layout dataBase, use Monte Carlo analysis.
 

Connect it as unit-gain feedback buffer to measure input offset.
 

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