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A question about "the negative resistance of cross-coupled pair"

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pablomarco

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Dear edaboard community,

I would like to ask you a question about the following figure.

1668958214068.png


Could you please help me derive the impedance seen through the source terminal of the pair? I wanted to derive it by myself (using the small signal model), but I could not achieve a result.

The result is --> Zin2 = -Z2 +2/gm

Thank you very much,
Best regards,
Pablo Marco
 
Last edited:

I have seen these videos, but they are not related to my issue because in my question I am trying to find the impedance seen through the source, In the videos, the impedance seen through the drain is studied.

Thank you for your response.

So I am still looking for help for deriving it.
 

Yes thank you for your reply, it was what I have been doing. I just realized that I have been missing a point. I would like to share the solution for the community's disposal.

1669011402054.jpeg



Best regards,
Pablo Marco
 

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