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Differential OTA - Transient Output Swing Question

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stefannm

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I am simulating a fully differential OTA for a class project. I have the basic specs where I would like them (like gain,BW,PM). But, when I run my transient sims, I am seeing Vout and Voutb are not symmetric. Both are pulled up to about the common mode votlage of 1.1V and then are clipped. My differential output looks okay (Does this imply it is operating correctly), but I was expecting to see these signals to be symmetric. I have attached my schematic and output waveforms for Vout/Voutb. Is it my CMFB circuit causing this clipping? I have plenty of headroom on the high side on the internals of the opamp. Please help me resolve.

I am running the simulation in a unity gain configuration right now.

Thanks,
 

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