For the sensor timestamping you can try replicate an avalanche effect
with a device which uses a pn-pn substrate configuration ... or
something similar to the avalanche photodiodes.
The avalanche photodiode has very high gain and a response time of some
ps (5ps a commercial APD).
This system may cause some effects like high noise and would need high
breakdown voltages however.
The spurious capacitances can be minimized because in APDs it depends on
the sensor area, which is not needed in your case.
Regards,
Ilia.
On 05/03/16 12:31, Attila Kinali wrote:
Hi,
We had here a discussion about measuring events (ie time stamping
them precisely) with high rates. As some of you know, Javier and
his group, Bruce and me are working on a system that should give
us something better than 10ps (my guess is that we should get close
to 1ps) at a rate of (guestimated) 1MHz per channel. (Based on the
excitation of a LC tank and measuring the ring-down/phase with an ADC).
As it is with researches, we want the moon, and prossible even more.
So we were talking about getting the measurement rate up even higher,
to 10MHz and if possible 50MHz with the same precision. The above
approche will not work above 1MHz. Using different filters it might
be possible to get it up to maybe 10MHz, but it would be an awkward
design at best.
The only methods I am aware of (and could find) that achieve such high
rates are those, based on (vernier) delay lines (and their equivalent
ring oscillator ones) in ASICs. But this means that a costly ASIC needs
to be produced.
Does someone know of other methods that could achieve high measurements
rates with better than 10ps precision/accuracy? (This question is mostly
a hypothetical question out of interest, I don't plan to build one...yet :-)
Attila Kinali
--
Ilia Platone
via Ferrara 54
47841
Cattolica (RN), Italy
Cell +39 349 1075999
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