Hello,
I’ve modeled a simple diode circuit in QSPICE to test the VFWD
parameter in the .model
directive. However, I’ve noticed that setting VFWD=0.3
has no effect on the output voltage. The output remains around 0.831 V, regardless of whether the VFWD
parameter is specified or omitted. You can see this behavior in the attached schematic and simulation plot.
According to the documentation, the VFWD
value should define the forward voltage drop, but that doesn’t seem to be happening here. Interestingly, the VREV
parameter does appear to work as expected.
It would be really helpful if someone could confirm whether this is a tool limitation or if I’m missing something in the modeling process. Fixing this or providing a workaround would really help as I continue with modeling more complex circuits.
Thanks in advance!