how to get this plot in OPAMP simulation

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eegchen

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This is result from a OTA simulation. The OTA is a basic folded cascod OTA with differential PMOS input stage,connecting a folded cascode output stage.

The x is Vod( differetial output voltage), the y is Rout.

Any one can tell me how to get this result, How to set up the simulation.
 

I guess u can sweep Vod from a value to another one, than u can calculate the corresponding differential gain...
 

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