hallo,

i have just tried to add white noise to the resistance model with Verilog-Ams, so my code

`include "constants.vams"
`include "disciplines.vams"

module restest (p,n);

inout p,n;
electrical p,n;
electrical pi;
parameter real r=1.0k;

analog begin

V(p,pi) <+ I(p,pi)*r;
V(pi,n) <+ white_noise(4*`P_K*$temperature*r,"thermal");

end

endmodule

but it does not work. If i removed the noise statements, it functions. Analog, i want to bring flicker_noise to my VCO model. I have the same problem.

Marq is correct; I suspect actually that the internal node is causing trouble in this case (though it shouldn't).  The curious thing about the contribution operator (<+) is that it accumulates; it's not an assignment.

You could also try the conductance formulation:
Code:

I(p,n) <+ V(p,n) / r;
I(p,n) <+ white_noise(4*`P_K*$temperature / r,"thermal");