Differential Amplifer with Active Load, dc gain question

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sinisterx

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When I created and simulated a differential amplifier with an active load, for some reason I'm getting an incorrect DC graph.

All the mosfets are biased in saturation, does anyone know what the problem could be?

I have attached the schematic as well as the dc graph.

 

It is not clear what you are sweeping but if it is V18 then you are looking at the common mode response which would explain why the output is fairly flat once you reach enough voltage to turn on the input stage.

Keith
 

Should I be sweeping that or the current source voltage source?
 

I would have thought V4 or V2 although ideally you want a linked source (using a VCVS) so as V4 increases, V2 decreases.

Keith
 

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