Integration methods when simulating

Hi all,
I have simulated a comparator. Before the comparator trips where it should it trips a bit earlier with no apparent reason. I am using gear2only and tried traponly and when using the trapownly I don't see this strange behaviour. Basically I am sweeping the input of the comparator very slowly against a reference to assess the offset.

Is this normal? Has anyone seen something like this? Thank you

Maybe not "normal" but not unheard of. You can run into
numerical issues in high gain circuits, varying by integration
method.

TRAP has the problem of being underdamped / undamped.
If you look close enough there's always a tiny bit of
"sawtoothing" timepoint-to-timepoint. A minuscule error
that keeps repeating and reversing, can be gained up
by the circuit behavior to make significant error behaviors.

GEAR (variable-order) can be better or worse. I don't know
too much about GEAR. I used to use the default TRAPGEAR2
back in Cadence days, unless I saw kooky stuff like you
describe.

When stuff gets weird I like to fall back to Euler, which
is inherently damped (don't ask me why - math, mumble
mumble). The downside of Euler is that it can also damp
out real problem behaviors (like local oscillation / ringing).