I will use a dedicated FPGA design, and the data will be stored into an
SDXC card (UHS), or an IDE drive (maybe not), in RAW mode (no filesystem).
Each timestamp will be stored into a word of 48bits, the clock will be
400MHz, so the quantization will be 2.5ns, but the maximum error/clock
offset should be 1/10 of this, so 500ps , as said by Bruce.
Regards,
Ilia.
Il 27/04/2016 00:29, Attila Kinali ha scritto:
On Tue, 26 Apr 2016 22:24:08 +0200
Ilia Platone <[email protected]> wrote:
I must print each photon event captured by an APD at the focus of more
telescopes, these events must be timestamped with an accuracy of 2.5ns,
As i wrote before, 1ns should be doable with standard timing GPS receiver
and calibration at those short baselines. Going below that will be a
challenge though.
and the expected rate is lower than 10MHz.
10MHz is quite a high rate of events that need to be timestamped.
How do you intend to measure events at such a high rate? And how
do you intend to store so much data? Each measurement will need
at least 40bit resolution, at 10MHz that's 50MByte/s. Even if you
say that the average rate is only a fraction of that and you use
lots of buffers, that's still a high data rate for a measurement
instrument.
Attila Kinali
--
Ilia Platone
via Ferrara 54
47841
Cattolica (RN), Italy
Cell +39 349 1075999
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
