Jack,
Should anyone in the group need any Xilinx FPGA, we can supply at a steep
discount off of Digikey pricing, if Xilinx will not provide them for free.
We have supplied Xilinx for both the Cameras on the Orion space mission, and
for Harvard Smithsonian on the EHT (Digicom), and also for the front-end
calorimeter replacement on Cern. We can support proto quantities. Email is
[email protected]
John Pallazola
CMO
iBuyXS, iBuyPPE
Adapt. Evolve. Excel.
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From: Jack Hickish <[email protected]>
Sent: Monday, October 26, 2020 10:38 AM
To: casper <[email protected]>
Subject: Re: [casper] ADCs in CASPER
Hi Gareth,
On Mon, 26 Oct 2020 at 12:49, Gareth Callanan <[email protected]
<mailto:[email protected]> > wrote:
Hi Casper Community
Now that roach2 has been deprecated, I have been wondering where the CASPER
community is heading in terms of future ADC work.
As far as I can tell there are three options available:
1. SNAP boards - The SNAP boards seem to support the largest number of
options 12 x 250 Msps/ 6 x 500 MSps or 3 x 1000 Msps. SNAP is used by HERA,
but I don't think it is used anywhere else.
These are also used by a few other Berkeley and Berkeley-adjacent projects
-- Breakthrough @ Parkes, the ATA. There also used by Caltech in the DSA.
Possibly some other folk have them
1. SKARAB and the SKARAB ADC - The SKARAB ADC can sample at up to 3
GSps. From what I can tell, it does not seem to be widely used. I imagine it
would be quite an expensive configuration.
2. ZCU111 RFSoC - The ZCU111 RFSoC seems to be a good board for
experimentation, but if we wanted to build a many antenna array (N > 100),
XIlinx may not be quite able/willing to provide us with that many dev
boards.
At the ATA we're pursuing a system using the HTG ZRF16 RFSoC platform. There
are a bunch of Commercial RFSoC platforms, at various price points.
The SKA-Low project was once looking at building a custom RFSoC platform.
They also already have the Kintex Ultrascale iTPM which has 32 onboard ADC
channels.
Alternatively, maybe there is some cheap FMC ADC out there that could make
everyone happy? (Although then we would need to find an FMC carrier card)
For the Caltech LWA352 system we're using a SNAP2 (dual FMC) with a custom
ADC card. I believe a few people are experimenting with fast ADCs on FMC
carriers with the VCU118/128. There are _lots_ of commercial platforms which
would support FMC ADCs. The Institute of Automation (designers of the SNAP2)
have a variety of FMC ADCs they use on their projects with various
combinations of number-of-inputs and bandwidth / sample rate.
Personally I think most deployments in the future will be on platforms which
support 100G, so I can't imagine there will be a huge number of SNAPs used
in the coming years.
Just my random musings,
Jack
>From the options available, it seems to me that SNAP is the board that is
most likely to be deployed in a large array, and the ZCU111 board is what is
most likely to be used in labs/small arrays.
Is that a correct read of what is available? Or are there other projects in
the works?
We have cheap COTS options for building X/F-Engines. As far as I can tell,
an easily accessible ADC board is the main bottleneck to quickly
prototyping/building a correlator.
Gareth Callanan
Digital Signal Processing Engineer
South African Radio Astronomy Observatory(SARAO)
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