[time-nuts] Shera revisted

Bruce Griffiths bruce.griffiths at xtra.co.nz
Fri Aug 12 17:02:59 EDT 2016

On Friday, August 12, 2016 12:21:55 PM David wrote:
> 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 
> >> throw in another $2 for an opamp to build a time-to-amplitude 
> >> (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 
> >> 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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Not that I've seen.
However there are multichannel  damped sine TDCs with 5ps resolution 
from Keysight.


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