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we have made the changes in circuit schematic and simulated.we biased the transistor and used these values in schematic but even then the gain is negative can you suggest some 130nm transistor model.MOS 3 is totally off pA !
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you connected the gate voltage of MOSFET4 to negative voltage !
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I do not understand your biasing circuit.
We did check the DC operating point and simulated the schematic and still are getting negative gain. Have we used the bias characteristics value correctly ? If not how do we do it ?Have you ever checked the DC Operating Point of the MOS transistors ? I think they don't work because the Bulks are not connected to nowhere.