mat4.m

mos transistor, basic simulation

hold on
vgs=.8;
vbs=0.001:.001:.5;
vds=1.9;
    for i=1:500
        vt(i)=.4+.45*(sqrt(.9-vbs(i))-sqrt(.9));
        if vgs<vt(i)
        id(i)=vgs.*0;
        end
        if vds<vgs-vt(i) && vgs>=vt(i)
        id(i)=.774.*((vgs-vt(i)).*vds-vds.^2./2).*(1+.1.*vds);
        end
        if vds>=vgs-vt(i) && vgs>=vt(i)
        id(i)=.774./2.*((vgs-vt(i))^2).*(1+.1.*vds);
        end
    end
    plot(vbs,id)