How to sim negative Gm ??

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super

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Could someone tell me how to sim colippts active negative R ?
I use colippts circuit , one MOS and 2 extrnal cap .
I try put current source between Gate and Drain , but sim result
real part is -3k , it's seems not correct.
so if you have this paper or sim method ,please help me ...

3Q3Q
8O 8O 8O 8O
 

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