Someone help me to plot Ids vs Vds for HEMT AlGaN/GaN
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i'm trinig to plot Ids vs Vds with matlab and i'm not having any result please check my code ;
Vth=2e-7;
Vs=1.5e-7;
Z=150e-6;
e=1.6e-19;
ep=8.85e-12;
mn=9.1e-31;
dd=30e-9;
di=7e-9;
x=1.05e-34;
u=1.257e-6;
L=150e-6;
Vgs=-4;
Vds=0;
Vdsat=Vgs-Vth+Vs-((Vgs-Vth)*(Vgs-Vth)+Vs*Vs);
if(Vdsat<Vds)
Ids=2*Z*e*e*ep*mn*Vs/(2*(dd+di)*e*e*mn+ep*pi*x*x)*(((Vgs-Vth)*(Vgs-Vth)+Vs^0.5)-Vs);
end
if(Vdsat>Vds)
Ids=2*u*Z*ep*e*e*mn/(L*(2*(dd+di)*e*e*mn+ep*pi*x*x))*((Vgs-Vth)*Vds-((Vds*Vds)/2));
end
figure;
plot(Vds,Ids);
xlabel('Vds (V)');
ylabel('Ids (mA/mm)');
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답변 (2개)
Aquatris
2024년 6월 28일
편집: Aquatris
2024년 6월 28일
I think what you are trying to do is vary Vds and see what Ids becomes. So here is a simple some modification for it using for loop. However you should try to vectorize the for loop for efficient code:
Vth=2e-7;
Vs=1.5e-7;
Z=150e-6;
e=1.6e-19;
ep=8.85e-12;
mn=9.1e-31;
dd=30e-9;
di=7e-9;
x=1.05e-34;
u=1.257e-6;
L=150e-6;
Vgs=-4;
Vds=-60:0.01:60; % generate a vector of interest
Vdsat=Vgs-Vth+Vs-((Vgs-Vth)*(Vgs-Vth)+Vs*Vs);
for i = 1:length(Vds) % loop through Vds and calculate corresponding Ids
if(Vdsat<Vds(i))
Ids(i)=2*Z*e*e*ep*mn*Vs/(2*(dd+di)*e*e*mn+ep*pi*x*x)*(((Vgs-Vth)*(Vgs-Vth)+Vs^0.5)-Vs);
end
if(Vdsat>Vds(i))
Ids(i)=2*u*Z*ep*e*e*mn/(L*(2*(dd+di)*e*e*mn+ep*pi*x*x))*((Vgs-Vth)*Vds(i)-((Vds(i).*Vds(i))/2));
end
end
figure;
plot(Vds,Ids);
xlabel('Vds (V)');
ylabel('Ids (mA/mm)');
댓글 수: 2
Stacy
2024년 11월 2일
Can you please tell me how you are getting the unit of current as A/mm? As I can see in the code you didn't mention any division by 1000.
Aquatris
2024년 11월 4일
I have no idea about the units since non of the units are written for the variables. I just copied and modified the OP's code and modified to do what I assumed OP wanted to do.
Unless the units of each variable are given, it is hard to judge if this plot labels are correct ro not
Pavl M.
2024년 11월 25일
편집: John Kelly
2024년 12월 9일
vectorized solution + units update:
clc
clear all
close all
Vth=2e-7;
Vs=1.5e-7;
Z=150e-6;
e=1.6e-19;
ep=8.85e-12;
mn=9.1e-31;
dd=30e-9;
di=7e-9;
x=1.05e-34;
u=1.257e-6;
L=150e-6;
Vgs=-4;
Vds=-90:0.01:60; % feasible span(region) of Drain-Source transistor potential, [V]
Vdsat=Vgs-Vth+Vs-((Vgs-Vth)*(Vgs-Vth)+Vs*Vs);
Ids=2*u*Z*ep*e*e*mn/(L*(2*(dd+di)*e*e*mn+ep*pi*x*x))*((Vgs-Vth)*Vds-((Vds.*Vds)/2));
Ids(Vdsat<Vds) = 2*Z*e*e*ep*mn*Vs/(2*(dd+di)*e*e*mn+ep*pi*x*x)*(((Vgs-Vth)*(Vgs-Vth)+Vs^0.5)-Vs);
figure;
plot(Vds,Ids);
xlabel('Vds (V)');
ylabel('Ids (A/mm)');
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