Hi Ryan,
We'd be interested in learning more about your interleave-fixing technique
as well. If JPL will let you tell us about it that would be great. If
you can't release detailed code/etc, even a high-level description of the
approach would be nice.
Cheers,
Paul
On Mon, 28 May 2012, Ryan Monroe wrote:
I've used the ADC083000s before and the interleave can be pretty bad-- as
much as 15% difference across their 3GHz spectrum! You should expect better
performance because you only need to tune for 1GHz of bandwidth however. I
can't speak for the other parts.
I have a technique I've developed which cancels out all cross-board ADC
interleaving issues. I've been trying to get JPL to let me release it to the
public domain: I'll see what I can do, and please tell me if you have issues.
--Ryan Monroe
On 5/28/2012 5:47 PM, Dan Werthimer wrote:
hi bill,
i think all the boards you mention have analog bandwidth out to 2 GHz,
so they should work well for your 1-2 GHz band.
the asiaa board is the least expensive, but this board does not have
programmable attenuators like the Kat-ADC. the asiaa board can be used
as a single 5 Gsps ADC, or as a dual 2.5 GHz ADC. we have used the
asiaa board as a single 5 gsps adc, and it works quite well. but we
have never tested it as a dual adc - perhaps others reading this email
can give you advice about using it in dual mode. if you are using
roach I, you can't get the 8 bit version of the asiaa board working at
the full 5 gsps. if you are using roach II, you can use it at 5 Gsps.
best wishes,
dan
On Thu, May 24, 2012 at 11:30 AM, Bill Petrachenko<[email protected]>
wrote:
I'm designing a digital data acquisition system using a ROACH1 board. I
need
to sample two Nyquist zones at 1024-2048 MHz. It appears that in the
Casper
group of products, a pair of ASIAA, ADC1x3000-8, or KatADC boards would
work
well and nicely interfaced to a single ROACH1 board (although the ASIAA
board is not mention explicitly on the web-site). Is there any reason to
choose one board over another? The gain adjustment stage is attractive on
the KatADC but the performance of the ADC1x3000-8 chip seems marginally
better at 2-GHz input frequency. The e2v chip seems less established than
the National chips. Is interleaving or calibration an issue for any of the
chips?
I'd be grateful for any opinions on this.
Thanks, -Bill.
