What is charging my output capacitor?

[erma]

Hello QSpice community,
I was testing a class AB amplifier, but then I noticed some weird charging when the PMOS transistor was missing, as you can see in the picture below (output O1):

What is charging O1? M1 Vgs (in light blue) is negative, I tried forcing IS=0 on the NMOS model (reverse body diode current) but the charge is still there. Is there some Roff I am missing in the documentation of the MOS?
I put the AB just below, where the PMOS would prevent this behavior.

Best,
Erma

CD.qsch (7.8 KB)

[KSKelvin]

In SPICE, there is simulator option (.option) gmin (Minimum conductance) and in default is 1e-12Ʊ. It is equivalent to add 1/gmin resistor in parallel to every PN junction.

Here to set gmin to 1e-15 which further reduce the charging time.

[erma]

Nice to know, thanks !