I didn't check whether this equation made any sense, and I didn't set the parameter values to anything meaningful - I just wrote it to illustrate the syntax:

Code:

`include "disciplines.vams"

module equation(y,x);
output y;
input x;
electrical x,y;

parameter real a=1.0;
parameter real b=1.0;
parameter real c=1.0;
parameter real d=1.0;

analog begin
  V(y) <+ V(x)/(a*exp(-0.5*pow((V(x)-b)/c,2)))+d;
end

endmodule
 

Regards,

Andrew.