[time-nuts] Shera revisted

David davidwhess at gmail.com
Fri Aug 12 13:21:55 EDT 2016


On Fri, 12 Aug 2016 13:56:40 +0200, you wrote:

>Hi everyone,
>
>On 2016-08-11 21:06:12, Attila Kinali wrote:
>> Hoi Bert,
>
>> I'm asking, because if you go the way of using a CPLD anyways, you could
>> throw in another $2 for an opamp to build a time-to-amplitude converter
>> (à la PICTIC II) and boost the resolutiong from 40ns to <100ps.
>> As you would be measuring the PPS relative to the local clock, you
>> would need only one "leg" of the PICTIC II (ie just one TAC plus a single ADC).
>
>I'd want to use the programmable logic to build a (mostly) digital 
>interpolation, either something along the lines of the 5370, or digital 
>interpolation of the clock using DCM's like I did on a Spartan-3 years 
>ago. On that device, I could achieve a 16-fold resolution increase by 
>use of the clock management devices.
>
>I'm currently trying to replicate my old digital clock interpolation 
>setup on the Xilinx/Digilent Arty board, with the aim of locking a Rb to 
>GPS.
>Another goal is to get a DDMTD going on the Arty board for clock 
>comparisons.
>
>Regards, Paul Boven.

The HP5370 design seems awfully complicated unless it is significantly
faster than a time to amplitude interpolator.  Integrating time
stretching interpolators which were contemporary to the HP5370 were
only 20 times slower and a time to amplitude interpolator is much
faster.

Are there any modern implementations of the interpolator used in the
HP5370?


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