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I am trying to simulate my circuit for one of the question problems. The question looks like this

Picture of the question

I have written a MATLAB script to see the expected graph

%Script for making a plot of the problem 5.26

vt = 0.5 ; vd = 1 ; k = 2e-3;

vgd = 0:0.1:1.8; id = zeros(size(vg)); % Initialize id as a vector i = 1; %just to assign them

for vg = 0:0.1:1.8

%cut off situation
if vg <= vt
    id(i) = 0; 
i = i+1; 

%triode situation 
elseif (vd<=(vg-vt))

    id(i) = k.*(vg-vt).*vd - (k.*vd^2/2); 
 i = i+1 ; 
%saturation situation 
elseif (vd>(vg-vt))

    id(i) = k/2.*(vg-vt)^2; 
i = i+1; 
   end

 

end

 plot(vgd, id) ; 

title("Id/Vg relationship graph")

Which pretty much give me a graph like this

Expected graph

I am trying to now simulate it on multisim and I am not getting anything. I am doing DC sweep to analyse the Id. I am changing the vgs with 0.1V increment till 1.8

this is my multisim circuit simulation

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    \$\begingroup\$ The Vd voltage source is not well wired ... And just measure Id vs Vg. \$\endgroup\$
    – Antonio51
    Commented Mar 10 at 18:20
  • \$\begingroup\$ Thank you. I am getting almost similar but still a little different graph now after counting the vd other part with the ground \$\endgroup\$
    – Pococurante Bird
    Commented Mar 10 at 20:19

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