Hi All,
I am using verilog A model of TFET from Penn State University which is given below.
`include "constants.vams"
`include "disciplines.vams"
module NTFET(d,g,s);
inout d,g,s;
electrical g,d,s;
real Ids, Cgs, Cgd, Qs, Qd,Qg;
parameter real W=1; //Device width
analog begin
Ids=$table_model(V(d,s), (V(g,s)), "IdVg-NTFET_Lg20nm.tbl","1LL,1LL");
Cgd=$table_model(V(d,s), (V(g,s)), "CGD-NTFET_Lg20nm.tbl","1LL,1LL");
Cgs=$table_model(V(d,s), (V(g,s)), "CGS-NTFET_Lg20nm.tbl","1LL,1LL");
if(analysis("dc")) begin
I(d,s) <+ 1*Ids*W;
end
else begin

if(analysis("tran")) begin
Qd = (-1*W*Cgd)*(V(g,d));
Qs = (-1*W*Cgs)*(V(g,s));
Qg=-1*(Qd+Qs);
I(d,s) <+ 1*Ids*W ;
I(d) <+ ddt(Qd);
I(s) <+ ddt(Qs);
I(g)<+ ddt(Qg);
end
end
end
endmodule

This is basically a table driven model . DC and transient analysis has been done . I want to do ac analysis with this model . If anyone could help me regarding this , I will be thankful.

Thankls

I will be thankful to you if you could help me clearing one more doubt.
As it is a table driven model , so length is fixed to Lmin. Width is also initiated as W=1.
If I want to use this model for different values of W/L , then what are the expressions which I need to change in the code.
Secondly is there any possibility to use fractional aspect ratios?
Thanking you in anticipation.