[casper] SNAP2 with ADC16 board

[Nitish Ragoomundun]

Hello everyone,

We have a tile of 24 antennas from which we need to acquire data. The
central frequency is
327.4 MHz and our working bandwidth is 250 kHz. We need to convert the 24
analogue
channels to digital. For this we were thinking about 2x SNAP2 boards
operating 12 channels
each at 250 MSps. The SNAP FPGA will then filter, decimate and convert the
samples to a
stream of quadrature samples at a rate of 250 kHz (IQ). Finally the FPGA
will need to put the
samples in time-stamped packets and ship them out towards a processing
server.

We already have one SNAP2 board. Once, Dan Werthimer suggested using the
ADC16 board
to obtain 16 additional channels. We have a few questions about this
implementation:

- Does the ADC16 have yellow blocks in the CASPER toolflow to work with?
- Can we please have a link to more information about the ADC16 boards in
order to learn about
  the detailed specs, power inputs, clocking inputs, cost, etc.
- For a single SNAP2 acquiring 24 channels, will the FPGA be able to cope
with the workload for
  the filtering and packetization part?

Thanks.

Cheers,
Nitish

-- 
You received this message because you are subscribed to the Google Groups 
"casper@lists.berkeley.edu" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to casper+unsubscr...@lists.berkeley.edu.
To post to this group, send email to casper@lists.berkeley.edu.

Re: [casper] CASPER design question

[Dan Werthimer]

hi dale and neal,

do you know how many frequency channels are needed?
or is this a continuum correlator ?

i think the lowest cost  system would be a conventional casper packetized
FX correlator architecture
using snap1 boards, a 40Gbit ethernet switch (for the corner turn),
possibly adding an ADC16 board to each snap1 (to get more analog inputs per
snap1),
and optionally using GPU's to correlate instead of FPGA's.

snap1 fpga boards can sample
12 inputs at 250 Msps
  6 inputs at 500 Msps
  3 inputs at 1000 Msps

if one plugs an ADC16 board into the snap1 board, then you get an additional
16 inputs at 250 Msps
  8 inputs at 500 Msps
  4 inputs at 900 Msps
but depending on how many bits are needed to transmit to the X engine
(most people use 4 bit real, 4 bit imaginary), you might run out of snap1
ethernet bandwidth
(20Gbit/sec input, and 20 Gbit/sec output max) before you can use all the
analog inputs
from the additional ADC16 board.

best wishes,

dan





On Mon, Dec 24, 2018 at 8:48 AM Gary, Dale E.  wrote:

> Hi Casperites,
>
> I received an inquiry from Neal Hurlburt, from Lockheed Martin (Palo
> Alto), who wants to look into the possibility of using CASPER hardware and
> tools to design a prototype system for interferometry of optical signals.
> So far the specifications are quite fluid (see message below)--they would
> like a 500 MHz bandwidth, but would accept as low as 50 MHz.  However, he
> is looking for 60-100 inputs, so I guess he is driven to the lower end of
> this bandwidth range.  Neal is not an engineer, but he can relay some
> suggestions from this list to engineering support at Lockheed.  If anyone
> has some suggestions for Neal, especially any projects of a similar nature,
> he would be delighted to hear from you.  I added his name to the cc list.
>
> Many thanks,
> Dale
>
> Hi Dale,
>
> Thanks for the info on your experience with CASPER. At a minimum, we are
> looking for a system that can digitize and correlate about 60 elements at
> 50 to 500Mhz each. It sounds like CASPER is a good starting point. Who do
> you suggest we talk to at Berkeley?
>
> Thanks,
> Neal
>
> 
> Neal Hurlburt
> Manager, Space Science & Software
> Space Science & Instrumentation
> Lockheed Martin ATC
> 650-354-5504
> hurlb...@lmsal.com
>
> --
> You received this message because you are subscribed to the Google Groups "
> casper@lists.berkeley.edu" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to casper+unsubscr...@lists.berkeley.edu.
> To post to this group, send email to casper@lists.berkeley.edu.
>

-- 
You received this message because you are subscribed to the Google Groups 
"casper@lists.berkeley.edu" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to casper+unsubscr...@lists.berkeley.edu.
To post to this group, send email to casper@lists.berkeley.edu.

RE: [casper] CASPER design question

[Neil Salmon]

Dear Gary and Neal,

I have similar requirements for non-radioastronomy passive mm-wave imaging 
applications, which may lie close to those of Lockheed Martin. I did find it 
difficult to adapt CASPER hardware as it has requirements not entirely aligned 
with these non-classic radioastronomy applications, ie it requires ~1 GHz 
bandwidth on hundreds of receiver channels. However, I watch this space in case 
capabilities start to emerge here where I could collaborate with community for 
spin out applications in pmmw imaging where powerful cross-correlators are 
required.

Many thanks,
Neil

From: Gary, Dale E. [mailto:dale.e.g...@njit.edu]
Sent: 24 December 2018 16:48
To: casper list
Cc: Neal Hurlburt
Subject: [casper] CASPER design question

Hi Casperites,

I received an inquiry from Neal Hurlburt, from Lockheed Martin (Palo Alto), who 
wants to look into the possibility of using CASPER hardware and tools to design 
a prototype system for interferometry of optical signals.  So far the 
specifications are quite fluid (see message below)--they would like a 500 MHz 
bandwidth, but would accept as low as 50 MHz.  However, he is looking for 
60-100 inputs, so I guess he is driven to the lower end of this bandwidth 
range.  Neal is not an engineer, but he can relay some suggestions from this 
list to engineering support at Lockheed.  If anyone has some suggestions for 
Neal, especially any projects of a similar nature, he would be delighted to 
hear from you.  I added his name to the cc list.

Many thanks,
Dale

Hi Dale,
Thanks for the info on your experience with CASPER. At a minimum, we are 
looking for a system that can digitize and correlate about 60 elements at 50 to 
500Mhz each. It sounds like CASPER is a good starting point. Who do you suggest 
we talk to at Berkeley?

Thanks,
Neal


Neal Hurlburt
Manager, Space Science & Software
Space Science & Instrumentation
Lockheed Martin ATC
650-354-5504
hurlb...@lmsal.com
--
You received this message because you are subscribed to the Google Groups 
"casper@lists.berkeley.edu" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to 
casper+unsubscr...@lists.berkeley.edu.
To post to this group, send email to 
casper@lists.berkeley.edu.
"Before acting on this email or opening any attachments you should read the 
Manchester Metropolitan University email disclaimer available on its website 
http://www.mmu.ac.uk/emaildisclaimer "

-- 
You received this message because you are subscribed to the Google Groups 
"casper@lists.berkeley.edu" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to casper+unsubscr...@lists.berkeley.edu.
To post to this group, send email to casper@lists.berkeley.edu.