Hi Scott,
Your plan in point 1 is entirely defensible from a hardware perspective. The
data rates across each Z-DOK connector to Virtex 5 GPIOs supports 5 GSa/s 4 bit.
In point 2, I think that's a fine strategy in principal but I am personally
unsure of the exact status of the yellow block whi
Hi Jonathan,
Thank you for the detailed response (which I read after replying to
Homin - doh). We already have our ROACH-1 here and are trying to keep
costs down so I'm going to push ahead a little more with trying to
figure out if we can get this to work with a ROACH-1 and 1:2 ADCs. I
do have a
Hi Ross,
I am commenting this older thread prompted by your most recent message re
DMUX1:2 ADCs, to which Homin responded today.
Your approach, and the advice received from Dan and Glenn, is sound---in
principal. With suitable bit codes, you can run DMUX1:2 4-bit versions of the
ASIAA ADC at
Hi Dan and Glenn,
All sounds good - I think have the ROACH-1 design will help us out a lot
here to get started. We really don't need a very high spectral response as
we are just trying to measure the amplitude and phase of a PSFs wings
referenced to the central core of the PSF.
Cheers,
Ross
On
hi ross,
we never got our roach1 design working at 5 Gsps,
although we never tried. our design goal was 3 Gsps.
if you don't need a lot of spectral channels, you could
probably fit into roach1 a decimate by 16 design, and clock
the fpga at 5 GHz / 16.if you need a lot of spectral
channels,
Note that the design Dan is referring to currently has only been
tested to ~1.5 GHz BW. Getting to higher bandwidths will likely
require some work to meet timing. Also the data comes out over 10
gigabit Ethernet so requires something to catch the data.
On Tue, Feb 12, 2013 at 4:02 PM, Dan Werthime
Hi Glenn,
Thanks, I was being a tad blase regarding Nyquist/sampling rates. I think
if we can operate at 2.5GHz BW on each channel using the ROACH-I then we
should be fine - at least as a good proof of concept.
Ross
On Tue, Feb 12, 2013 at 12:58 PM, G Jones wrote:
> Hi Ross,
> One point to cla
hi ross,
how many frequency channels do you need in your two input correlator?
we have a full stokes VEGAS 1K channel spectrometer design
that uses a pair of ADC08-5000's.
(a full stokes spectrometer is the same thing as a two input correlator)
our current design is for roach2, but we had teste
Hi Ross,
One point to clarify, the 5000 refers to the samping rate, not the
total bandwidth. So a single ADC1X5000 demux 1:2 will give you 5000
Msps at 4 bits per sample, allowing you to sample signals up to 2.5
GHz bandwidth. With a single board, you'd need to put the board in the
mode that instea
Hi All,
I'm new to CASPER/ROACH boards and so apologies if this is obvious. We are
hoping to build a simple 2-channel correlator with a fairly high
bandwidth. We are in the process of ordering a ROACH-1 board and I was
thinking of also purchasing the ADC1X5000-8 ADC - A few questions:
1) Shoul
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