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gm for Difference Differential amplifier

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Vlad Cretu

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Hello,

I have the following circuit testbench which i presume it's wrong since i have problems plotting the gm.
I do in calculator deriv("current IS in the node of the gnd" ; tried also with a resistor, and still no luck). and I sweep the dc voltage of V4.

Could you please help me?

Thank you


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I'd think VPP & VNN are controlled by the same DC voltage (which is correct), but also by the same ac voltage (in phase), so there's no ac differential input at all.
 

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