[time-nuts] High rate, high precision/accuracy time interval counter methods

Attila Kinali attila at kinali.ch
Sun May 8 15:53:56 EDT 2016


On Wed, 4 May 2016 15:26:37 +0200
Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

> Indeed. ADC conversion speed is not a big issue these days, so the Nutt 
> style of interpolator is just expensive to parallelize for speed, the 
> time-to-voltage system is better and should have a much better 
> recycle-time and thus result in less hardware needs.

True and not true. Yes, there are many ADCs that do high conversion
rates, but these are optimized for piplined applications where conversion
happens at a constant rate. Ie they expect a constant conversion clock
with a constant rate. If you want to trigger conversion at an arbitrary time,
you either have to build your own sampler or need to  use one of the
non-pipelined ADCs whic are much slower (IIRC they stop around 5-10Msps
aka >100ns conversion time). Flash ADCs with direct access to the sampling
circuitry are basically extinct.

			Attila Kinali

-- 
Reading can seriously damage your ignorance.
		-- unknown


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