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Fully differential op-amp model on candence

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geo24

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Hi all,

I am trying to build a simple fully differential op-amp just use VCCS.

Here is the single-ended design I do in the cadence. single-ended op amp model.png

So I am wondering how can I build a fully differential op-amp model.
I don't need transistor level design. I need a model so I can change gain, bandwith. It's for my project. So I wanna have higher level design use ideal models before I replace them with transistor level designs.

If you have any other suggestion, please feel free to let me know. Thanks.
 

Dont connect the bottom node to ground, instead bring it out as Vout-, name Vo as Vout+. This should give you a fully differential design. Break the Ro and connect its middle point to a voltage source (VoutCM) to define the output common mode voltage.
 

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