Hi Gareth,
Jack, Jonathon, Nima, and I have been discussing a low-cost board to serve the
N>1000 space, w/ digitization at the antenna (2 ch; ≤ 500 GS/s; ≥ 12 bits; SOC;
low power; 10 GbE out). Do the above parameters overlap what you'd like to see,
and do you have a price point in mind?
Best,
Lincoln
On 10/26/20 8:49 AM, Gareth Callanan 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.
2. 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.
3. 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.
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)
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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