AnalogDE
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You're going to get discrepancies because in the gm/id method the plots are done assuming the transistor is in a diode-connected configuration (Vgs=Vds). But in your CS amp this is not the case with either transistor. Also, the gain will be sensitive to the input voltage and output voltage (it's not a static number). You can't really set the gain precisely in an open loop configuration -- you need to have some sort of feedback.
Usually when you're designing an amp you design it so that it has a "high enough" gain (i.e. a minimum gain). If you want precise gain then you need negative feedback.
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