How to get a graph for DG MOSFET (Ids vs Vds characteristics)????

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ARTI
ARTI 2013-12-20
评论： Walter Roberson 2022-8-28
if true
W=324;
un=1;
Cox=3;
Leff=6;
ld=3;
Ec=1;
lambda=25*10^(-5);
Vgs=0.5;
vth=2.04;
DIBL=0.5;
Vth=vth-DIBL
Vds=0:0.1:7%Vds Voltage value in Volts
Id=(2*W*un*Cox/Leff-ld+(Vds/Ec)) +(lambda* 2*W*Cox/(Leff-ld)^2)*((Vgs-Vth)*Vds-0.5*Vds^2)
plot(Vds,Id)
end

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回答（1 个）

Walter Roberson
Walter Roberson 2013-12-20
Id=(2*W*un*Cox/Leff-ld+(Vds/Ec)) +(lambda* 2*W*Cox/(Leff-ld).^2)*((Vgs-Vth)*Vds-0.5*Vds.^2)
  2 个评论
Walter Roberson
Walter Roberson 2022-8-28
Vds=0:0.1:7
That is a 1 x 71 vector
Vds^2
That is the matrix power operator, equivalent in this case to
Vds * Vds
where * is the algebraic matrix product operation, also known as "inner product". When you have A * B for two matrices, then size(A,2) must equal size(B,1) -- the number of columns of the first matrix must match the number of rows of the second matrix. However when you take a (1 x 71) * (1 x 71) then the number of columns in the first operand is 71, but the number of rows in the second operand is 1. Using * (matrix power) between a 1 x 71 and a 1 x 71 is not a valid calculation.
If you consider for a second you will see that for A^2 to be valid, A must be a square matrix (possibly a scalar)
If you want each element of Vds to be independently squared then you need the element-by-element power, which is the .^ operator.

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