Negative Resistance Element

[big_fudge98]

Hi,

I am using Cadence Virtuoso IC618 with spectre 19 simulator. I wish to experiment a bit with negative resitance. I know how to design a negative resistance circuit (cross-coupled pair, Colpitts oscillator etc), but I was wondering if there is an element in the analoglib which I can use, just so that I can experiment a bit. Does anyone know of such an element in any of the libraries?

Thanks.

 

[dick_freebird]

It might be easier to implement in veriloga,
but negative resistance may tend to challenge
solution and error trapping.

There's true negative resistance (V=-I*R) and
there's negative differential resistance (dV=-dI*R)
as seen in tunnel diodes, spark gaps etc. I'd bet
someone has made a LTSpice spark gap model.