Re: [casper] 1-2 GHz sampler

I've been looking at the ADC1x5000-8 board (which I assume is the same as the ASIAA board) . In the data sheet for the the EV8AQ160 they show that full-bandwidth is 2-GHz but then fail to give performance for ENOB, SNR, etc above 620-MHz. Does anyone know what ENOB/SNR is at 2-GHz?   Thanks,

Re: [casper] 1-2 GHz sampler

Hi Bill, There are measurements of the PCB with EV8AQ160 installed near DC posted on our Wiki: https://www.cfa.harvard.edu/twiki/bin/view/SMAwideband/MeasuringAndSettingParametersOfTheFourCores The plots are in terms of SINAD, linearly transformed to ENOB as follows. ENOB = (SINAD-1.76)/6.02

Re: [casper] 1-2 GHz sampler

ROACH1 to ROACH2?   Thanks, -Bill. From: Jonathan Weintroub jweintr...@cfa.harvard.edu To: Bill Petrachenko wtpe...@yahoo.ca Sent: Thursday, May 31, 2012 12:00:13 PM Subject: Re: [casper] 1-2 GHz sampler Hi Bill, Thanks, I was a bit mixed up and this does

Re: [casper] 1-2 GHz sampler

Werthimer d...@ssl.berkeley.edu; Casper Casper@lists.berkeley.edu Sent: Wednesday, May 30, 2012 9:19:48 AM Subject: Re: [casper] 1-2 GHz sampler MeerKAT's going to be using a 10-bit 1.8Gsps monolithic part. You won't quite get 1GHz bandwidth, but 900 is close. The ADC itself will do 2.2Gsps

Re: [casper] 1-2 GHz sampler

-ADC. Has this come to pass or has it become apparent that neither are required? Many thanks, -Bill. *From:* Dan Werthimer d...@ssl.berkeley.edu *To:* Bill Petrachenko wtpe...@yahoo.ca *Sent:* Monday, May 28, 2012 11:21:40 PM *Subject:* Re: [casper] 1-2 GHz sampler the kat-adc has two

Re: [casper] 1-2 GHz sampler

...@ssl.berkeley.edu To: Bill Petrachenko wtpe...@yahoo.ca Sent: Monday, May 28, 2012 11:21:40 PM Subject: Re: [casper] 1-2 GHz sampler the kat-adc has two different front end fiilter options. make sure to order the filter option for high frequency. dan On Mon, May 28, 2012 at 7:19 PM, Bill

Re: [casper] 1-2 GHz sampler

: Dan Werthimer d...@ssl.berkeley.edu To: Bill Petrachenko wtpe...@yahoo.ca Sent: Monday, May 28, 2012 11:21:40 PM Subject: Re: [casper] 1-2 GHz sampler the kat-adc has two different front end fiilter options. make sure to order the filter option for high frequency. dan On Mon, May 28, 2012

Re: [casper] 1-2 GHz sampler

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,

Re: [casper] 1-2 GHz sampler

For the ASIAA designed 8-bit ADC using e2v EV8AQ160 at 5GS/s we at CfA (chiefly Bob Wilson, Nimesh Patel and Rurik Primiani) have done a fair amount of testing using both swept sine waves and wideband noise as input. There are measurements of frequency response, SFDR, THD, noise power ratio,

Re: [casper] 1-2 GHz sampler

For the ASIAA designed 8-bit ADC using e2v EV8AQ160 at 5GS/s we at CfA (chiefly Bob Wilson, Nimesh Patel and Rurik Primiani) have done a fair amount of testing using both swept sine waves and wideband noise as input. There are measurements of frequency response, SFDR, THD, noise power ratio,

Re: [casper] 1-2 GHz sampler

Ryan, As Jonathan said, we have been testing the adc1x5000-8. I would also like to hear about your approach. We don't see such large core-to-core differences as you suggest and the improvements I have been able to achieve have been minimal from the point of view of a radio astronomy correlator.

Re: [casper] 1-2 GHz sampler

I wouldn't be surprised if Ryan has a more clever way to do it, but one option is to use an extension of the method that Matt Morgan and Rick Fisher (i.e. http://www.gb.nrao.edu/electronics/edir/edir320.pdf) developed for I/Q imbalance compensation. Basically you make a filterbank with each of the

Re: [casper] 1-2 GHz sampler

Thanks for the references. I have been planning to implement a compass search when we have more ADCs and I get back to evaluating them. Since our 4 cores are all on the same chip, the cores were more matched and I had a much smaller improvement in SFDR. Bob On Tue, May 29, 2012 at 1:50 PM,

Re: [casper] 1-2 GHz sampler

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

Re: [casper] 1-2 GHz sampler

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

[casper] 1-2 GHz sampler

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