Help with solving an equation

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Amy Topaz 2022-3-13

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评论： Amy Topaz 2022-3-13

I am getting an error while trying to solve the below equation (Function value at interval endpoints must differ in sign)

Any idea how to solve it

upCOX = 125;
vtp = -0.15;
lambda = -0.01;
l = 1;
we = 1;
Rload = 10000;
vdd = 1;
va = 0.2;
vgs = va - vy;
        eq1 = @(vy) - 1 + vy + Rload*((upCOX*(we/l)*(1-vy*lambda)*(((vgs-vtp)*(-vy))-(0.5*(vy)^2))));
        x1 = [0 1];
        vy = fzero(eq1,x1);
        disp(vy)

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Answer 1

Sam Chak 2022-3-13

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Hi @Amy Topaz

Make a direct substitution of vgs into the equation.

upCOX = 125;
vtp = -0.15;
lambda = -0.01;
l = 1;
we = 1;
Rload = 10000;
vdd = 1;
va = 0.2;
% vgs = va - vy;
        eq1 = @(vy) - 1 + vy + Rload*((upCOX*(we/l)*(1 - vy*lambda)*((((va - vy) - vtp)*(- vy)) - (0.5*(vy)^2))));
        x1 = [0 1];
        vy = fzero(eq1, x1);
        disp(vy)