First of all, thank you for your reply.
Unfortunately there is no way around a pulse stretcher because this is for a project at my university. Also it's not my own project, so I can't just change parameters as I like.
You see, I have some fix parameters: For one there is the initial pulse width of some hundred ps and also the minimum pulse width my TDC can handle which is as above 2.5ns
Inbetween those two there is however a comparator to sort out multipath propagation and so on.
And this I found out shortly after my post could also be a possible solution:
The comparator which is an ADCMP572, an ADCMP573 or an ADCMP582, all made by Analog Devices (and again no links, but this time I will double post to get you the links), has the ability to latch the output, which means it will stay on the last output for as long as the latch is active.
This I can use as described in the link (which will be in the upcoming post) to stretch the pulse to a varible length.
Perhaps you or someone else could help me with this approach instead. These are the two ways I imagine how I could solve my problem.
Best,
Fiech
---------- Post added at 03:09 ---------- Previous post was at 03:01 ----------
Ok, here now the links:
This are the three Comparators by Analog Devices:
Page for ADCMP572 with datasheets for ADCMP572 and ADCMP573
and here
Page and datasheet for ADCMP582
Also here the approach over the latch:
**broken link removed**
But perhaps I should begin a new topic for this approach...
Best,
Fiech
PS: I think, I should also say what my problem with the latch thingy is:
I actually don't know if this would work with the AD comparators because of the different way to switch on/off the latch, but I will think some more over it.