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Confused..why this cascade diff amp output distorts????

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DukeLeon

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confuse; distorts

Schematic

middle stage output

final output


The topology is seven stage cascade differetial amp (3rd and 4th stage are in parallel to provide offset compensation).
I have tried to bias the diff amp at different operating points but the output still distort. I haven't met this situation before, what is the problem???
thx
 

confuses distorts

looks like insufficient bandwidth. Can you try to simulate at much lower frequency and post the result?
 

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