Thanks for the tips, guys.
My main problem is that for such low input signals, hysterisis reduces sensitivity (of an LM393) quite significantly (see figure below--blue).
While with no hysterisis there is the well known noise problem (red)
My goal is to have the gray-coloured pulse line, for a variety of signal levels (from 200mv to 5 volts).
Note that both input signals occur exactly the same time..so no such problem there.
Now, my question is if there is any comparator out there (and maybe with some extra elements connected to it) that can solve such problem.
It is really necessary not to "trim out"/reduce sensitivity over the entire dynamic area (200mV-5Volts) of the system;while maintaining its information as "reliable"/realistic as possible..
Hope that gave u an extra insight,
regards,
xmat.