HI The Collins paper that Bruce referred to is the standard work on limiters / jitter / bandwidth. It can't and doesn't address all the possible issues in a full blown design. The math for the basic approach is all there though.
Bob On Jul 21, 2012, at 6:45 PM, ehydra wrote: > Interesting discussion but I must say I had several times a > brain-problem here ;-) > > Am I right that for that this is in general not fully understood? Are there > interesting papers? > > I'm interested here for two points: > 1. What is the right threshold for a comparator and on what it depends? > Looks like bandwidth of input signal, slew-rate of the comparator, noise > in the input signal. Maybe more. > Surely most of all people here know how to set the trigger right practical. > But what is the academic answer to this problem in the view of maximum S/N > behind the comparator? > > > 2. What if this is a if-strip amp with interstage filters. Maybe in the > look of a BPSK receiver. So we can connect to time-nuts GPS interests back ;-) > > >> Recall that the jitter of a trigger point is noise divided by >> slew-rate. > > Is it possible to expand here the explanation? Any reference? > > Thanks! > > - Henry > > > Magnus Danielson schrieb: >> You can view the schmitt trigger detector as having a state, and when >> in proximity of the trigger point, you let the noise control when the >> trigger point occurs. > >> Schmitt trigger is a nice tool, but it can do you great harm if you >> do not understand what it does help you with and what it doesn't help >> you with. >> You need to gain yourself to slew-rates where a schmitt trigger would >> do no harm, and when you are there it will do essentially no good >> either, as you are looking at a high slew-rate square signal. >> So, you *can* do better than a Schmitt trigger. A schmitt trigger can >> be sufficiently good. A schmitt trigger can work well if you have >> filtering in front of it to significantly reduce unwanted systematic >> noise. > > > -- > ehydra.dyndns.info > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
