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

[Bob Stewart]

Hi Bruce,
Thanks a LOT for your response to Poul's query!  I've been searching for DMTD info for a few some time now, and I haven't come up with a lot.  Searching for "CERN White Rabbit" got me more in a few minutes than I've found in months.  Like Poul, I've become interested in building a DMTD to overcome the limitations of my 5370A, but I haven't had time to actually do anything about it yet.

Bob




      From: Bruce Griffiths <bruce.griffiths at xtra.co.nz>
 To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
 Sent: Tuesday, January 5, 2016 2:19 PM
 Subject: Re: [time-nuts] DMTD - analog multiplier vs. diode mixer ?
   
You could also consider a DDMTD as useed in CERN's White rabbit project.Apart from the sine to logic level conversion its all digital. With care in the design the jitter should be sub picosecond.
Bruce
 

    On Wednesday, 6 January 2016 9:01 AM, Poul-Henning Kamp <phk at phk.freebsd.dk> 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 ?

-- 
Poul-Henning Kamp      | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG        | TCP/IP since RFC 956
FreeBSD committer      | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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