[time-nuts] DMTD - analog multiplier vs. diode mixer ?

Bruce Griffiths bruce.griffiths at xtra.co.nz
Wed Jan 6 06:36:16 EST 2016


Sorry I was under the impression I was replying to Don's post.
Sometimes my Windows machine seems to mess up the part of the thread to which 
I thought I was replying.
My Linux box doesn't seem to have this problem.

Bruce

On Tuesday, January 05, 2016 09:26:14 PM Charles Steinmetz wrote:
> Bruce wrote:
> >You mean DMTD =  dual mixer time differencenotDDMTD = Digital dual
> >mixer timer difference.The latter uses a pair of synchronisers /
> >shift registers instead of a pair of mixers.
> 
> I don't see how your comment is relevant to my post -- I did not
> mention either DMTDs or DDMTDs.  I only noted that the AD835 is
> noisier than a diode mixer, although not as noisy as many analog
> multipliers -- and that some noise improvement has been demonstrated
> by using parallel multipliers.
> 
> Charles
> 
> >On Wednesday, 6 January 2016 12:03 PM, Charles Steinmetz
> >
> ><csteinmetz at yandex.com> wrote:
> >  Poul-Henning wrote:
> > >My little HP5065 project is continually running into the jitter of
> > >my HP5370B counter which is annoying me, so I'm looking int DMTD.
> > >
> > >Everybody seems to be using traditional diode-mixers for DMTD,
> > >and to be honest I fail to see the attraction.
> > >
> > >Why wouldn't a analog multiplier like AD835 be better idea ?
> > >
> > >What am I overlooking ?
> >
> >You could have mentioned any of dozens of popular analog multipliers,
> >and the answer would have been, "because they are way too
> >noisy."  The AD835 is also substantially noisier than diode mixers,
> >but it at least begins to bridge the gap.  The folks at CERN have
> >been improving phase detector S/N by averaging the output of several
> >AD835s for the TPMON project, with promising results.  There is a
> >preliminary report in "EUROTeV Report 2006-005-1."
> >
> >See also:
> >
> >RF-based electron beam timing measurement with sub-10fs resolution,
> >A. Andersson and J. P. H. Sladen, CERN (EUROTeV Report 2008-015)
> >[phase detector with 8x AD835 analog multipliers].
> >
> >ANDERSSON, A. and SLADEN, J. P. H.: "First tests of a precision beam
> >phase measurement system in CTF3" (Proc. PAC07).
> >
> >"PRECISION BEAM TIMING MEASUREMENT SYSTEM FOR CLIC SYNCHRONIZATION,"
> >A. Andersson, J. P. H. Sladen, CERN (Proceedings of EPAC 2006).
> >
> >Best regards,
> >
> >Charles
> 
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