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I've created a MOSFET Differential Amplifier in PSpice, the schematic of which I've attached. However, when doing an AC sweep and adding a trace to do a Bode plot, the graph is a flat line, and I don't quite understand why. Shouldn't there be a negative response as frequency increases?

schematic

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  • \$\begingroup\$ What model have you used for the MOS? What frequency settings? If the MOS has the default settings, chances are most of them are idealistic zero. Try using a model from the library. \$\endgroup\$ Apr 19, 2020 at 6:42

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Mae your R1 5,000 ohms.

Your tail current is way too big.

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