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

Don Latham djl at montana.com
Tue Jan 5 22:22:41 UTC 2016

Mini-circuits has packaged phase detectors plug-in, surface, and with
connectors for $20 TO $70. Diode bridges with transformers. They also have
cheap wideband amps. Bet a simple DDMTD could be built with these? I know...I
wish I did have the time at present.
Happy New Year!

Magnus Danielson
> With some sine-to-square conversion as signal conditioning, not too hard
> these days, this could be a relatively straight forward approach.
> CERN already have digital clocks, so the DDMTD approach fits them well.
> For normal mixers you want to signal condition the signal prior to the
> mixers, and then signal-condition the beat notes too.
> For DDMTD you do the same, but you do the post mister conditioning in
> the digital domain.
> I have always assumed that signal-to-noise have been the main difference
> between the Gilbert cell multiplies vs. diode mixers.
> Cheer1s,
> Magnus
> On 01/05/2016 09:19 PM, Bruce Griffiths wrote:
>> 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 ?
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Felix qui potuit rerum cognoscere causas.
Lucky is he who has been able to understand the causes of things.
"Noli sinere nothos te opprimere"

Dr. Don Latham, AJ7LL
Six Mile Systems LLC, 17850 Six Mile Road
Huson, MT, 59846
mailing address:  POBox 404
Frenchtown MT 59834-0404

VOX 406-626-4304
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