[time-nuts] Sub 20 ps time detection

Mohammad-Hadi Sohrabi mhsohrabi at ucdavis.edu
Sat Mar 25 12:32:02 EDT 2017

I have been following the posts here for a while and learned alot. I
thought I could get some help as well.
I need to detect less than 20 ps between two incoming pulses from a
detector. pulses are 5ns wide and the rise time and fall time is around 2ns
I am planning to use a constant fraction discriminator, simply a fast
comparator with less than 500 MHz bandwidth for zero crossing detection and
providing a very sharp edge. Then this can be fed into a TDC such as GPX2
or anything of this sort. I think these can be fairly easily implemented on
Recently I stumbled upon LTC6957-4 logic converter from another discussion.
Can anyone guide me if this can be used for producing a sharp edge from a
pulse that I mentioned? Datasheet suggests 0.5 ns rise time is possible but
I think this is for single tone sine wave and not a short pulse.


More information about the time-nuts mailing list