modeling a sin varying resistor with spice

[tannayroli]

I need to simulate a sinusoidal varying resistor with spice. (physical model of stm spin noise)

something like
RR1 1 0 50*sin(FREQ)

I know how to do it it with Eldo:
-----
vv1 N1 0 sin(0 1 300meg 0 0)
rr1 N1 0 50
Rvarysin Nx Ny value={100*v(N1)}
-----

But I need to use it with a regular spice simulation. I use ngspice.

Does anyone know wich netlis I may use?

Thanks

 

[ThomasN]

You can do

.step param R list 0.1 0.2 0.25 ...

and list all of sinus values with the precision you like. It's only way I know how to do it.