From: "Tom Van Baak" <[EMAIL PROTECTED]> Subject: Re: [time-nuts] Some results of PRS10 and Trimble Resolution Date: Wed, 28 Jun 2006 23:01:42 -0700 Message-ID: <[EMAIL PROTECTED]>
> > would you have a schematic of an interpolator with say <5ns resolution to > > share? > > Said, > > On interpolators: > > 1) Another good example is found in the op/svc manual > for the SR620 -- which implements (in simple, non-ASIC, > 1980's TTL/ECL technology) time interpolators that are > good to 25 ps. Maybe overkill for you, but the design is > worth understanding. Do you happend to have that (and other SR) service manual online somewhere? I haven't checked their line to closely. > 2) I recall this recent paper ($) also made good reading: > Review of methods for time interval measurements with picosecond > resolution > http://www.iop.org/EJ/article/0026-1394/41/1/004/met4_1_004.pdf It gives an overview of methods and seems to be in a little deeper on various forms of gate-based methods. > 3) Google for words like time interval interpolator and you > will find quite a lot of sub-ns TIC ideas and products. Few > seem to be cheap or available, though. Indeed. It takes a bit of wading through tought. > 4) The wonderful US patent database also has design > info on time interpolators (which is good for us home > time-nuts but perhaps not so good for you if you plan to > put any of this into your commercial GPSDO product). There are several paths to finding what you want, one is to search for the manufactuers name (HP for instance). > You may in fact find your current 3.33 ns guess is fine. > Or maybe you'll find that it's not near good enough and > you are leaving good performance on the table. Let us > know what you come up with. Perhaps it will shed light > on why the classic HP GPSDO used a ~100 ps TIC. BTW, I know it (the Z3801) has interpolators. I just plain forgot for a while. Cheers, Magnus _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
