Please help me with this program as I am not getting the output?

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ARTI
ARTI on 12 Dec 2013
Edited: Walter Roberson on 14 Dec 2013
Z=100*10^-6;% gate width
q=1.6*10^-19;% electron charge
tn=1; %electron life time (value not known)
Popt=10; %incident optical power density
alpha1=0.5; %GaAs optical absorption coefficient(value not known)
d1=0.1 %thickness of GaAs layer(value not known)
h=6.6*10^-34; % plancks constant
c=3*10^8;
lambda=3.5;
Eph=h*c/lambda
Vs=2*10^7; %saturated drift velocity of the photo electrons
nsph=tn*Popt*(1-exp(-alpha1*d1)/d1*Eph)%electron concentration
Idsph=Z*q*nsph*Vs*(1-exp(Vd*u-Vd^2)/Vs*L)% drain to source photo current
plot(I,Vd)
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Image Analyst
Image Analyst on 14 Dec 2013
I don't see it. Maybe you attached it in your other thread. Are both threads discussing the same chunk of code? If so, why do you want to maintain two separate discussions on it?

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Answers (2)

Walter Roberson
Walter Roberson on 12 Dec 2013
Undefined variable Vd.
Paul
Paul on 13 Dec 2013
Edited: Walter Roberson on 14 Dec 2013
You have completely undefined your variables, lots are missing such as "Vd","u" and "I"
I have updated your code to give final value as an example.
clc
clear all
% Added variables
Ids=0;
u=6800; % Needs to be put into units
L=1*10^-6;% gate width
Vd=5;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Z=100*10^-6;% gate width
q=1.6*10^-19;% electron charge
tn=1; %electron life time (value not known)
Popt=10; %incident optical power density
alpha1=0.5; %GaAs optical absorption coefficient(value not known)
d1=0.1; %thickness of GaAs layer(value not known)
h=6.6*10^-34; % plancks constant
c=3*10^8;
lambda=3.5;
Eph=h*c/lambda;
Vs=2*10^7; %saturated drift velocity of the photo electrons
nsph=tn*Popt*(1-exp(-alpha1*d1)/d1*Eph)%electron concentration;
Idsph=Z*q*nsph*Vs*(1-exp(Vd*u-Vd^2)/Vs*L)% drain to source photo current;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
I=Idsph+Ids;
plot(I,Vd)
But not only that your equations are wrong I believe, or at least not complete as you seem to be arriving at Infinity answers which usually suggest improper maths.
Finally the Plot function should not be used for singular values and are used for sets of vectors or matrices.

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