Quote:I think you really need to sweep Vx on both sides to properly apply the Gummel symmetry test.
Oh, sweep both sides, u mean simultenaously Vd-Vx and Vs+Vx ? If that is the case, i do sweep together.
Cause the way i formulate the current is basically reference to source. Therefore, the input will looks like:
vx=0..1.2
Vd=2vx;
Vg=vg-vx;
Vb=vx-vb;
where current are function of input voltages and width and length,
Id=f(Vd,Vg,Vb,W,L);
After which, i'll flip both the vx and Id(without the 1st point,which is vx=0) to plot for gummel symmetry test result.