Re: [casper] New Wideband Spectrometer Designs

[Jonathan Weintroub]

Hi John, Homin and CASPER lists, I think most of the useful content has been expressed already, I’ll only state that my interest in ultra-fast ADC work continues, and I look forward to discussions at the workshop.  I’ll trot out my venerable table of high speed ADCs again, many of you have seen prior versions, there are a few new entrants.  Contributions always welcome. The most interesting device on the table based on paper specs is the A6B25G from Alphacore, 6-bits, single core, 25 GS/s, just perfect for the kind of work I do, interfaced on SERDES etc.   My most recent contact with Andrew Levy of Alphacore was on July 18. He said that they didn’t have test results on prototype chips yet to validate performance.  I will keep in ongoing contact, might ping him now, in fact. Of the parts we know to work and be available as commercial products, the ASNT7123 4-bit 16 GS/s is the most interesting, and is on the FMC+ board Homin is designing. Very interested in collaborating with CASPER colleagues in this ultra-wideband space. Regards, Jonathan On Aug 10, 2018, at 11:53 AM, John Ford <jmfor...@gmail.com> wrote: Hi all.  Thanks for the information.  I'll try and digest it!  John On Mon, Aug 6, 2018 at 6:48 PM, Homin Jiang <ho...@asiaa.sinica.edu.tw> wrote: Dear John: For the ADCs faster than 10Gsps, i think a bigger FPGA than ROACH2 is necessary. The speed of utrascale + FPGA is about 800/900MHz, that lead to 32 (10Gsps) or 64(16Gsps) parallel inputs to PFB/FFT. According to Rurik's equation, it  needs 4 or 16 times resource of FPGA in comparison to 5G adc. There are many FMC interface ADCs available in the market. Hitech Global is making the 10Gsps board using Analog Device 9213 (http://www.hitechglobal.com/FMCModules/12-bitADC_10Gsps.htm). Unfortunately, there is no FMC platform ported to JASPER so far. There are couple of groups working independently, Jack/Brian, Arashi and myself. So, i am thinking we should form a VCU118 working group to expedite the porting work. We can talk about this during the meeting. best homin On Tue, Aug 7, 2018 at 2:45 AM, David MacMahon <dav...@berkeley.edu> wrote: > Hi, John, > > I was speaking with Homin last week at the CASPER Hardware Porting Workshop > hosted in Cape Town.  He mentioned the Analog Devices 10 Gsps 12-bit ADC > that I think is the same one Dan referenced. My recollection of our > conversation was that the pricing was not so bad, but I could be conflating > that assessment with a different ADC. In any event, I think future ADC > boards will move to FMC (or FMC+) connectors.  This will necessitate new > host FPGA boards which is why the next gen CASPER toolflow emphasizes ease > of porting new boards to the CASPER toolflow. It’s an exciting upgrade in > processing capacity, but it’s still early days. Definitely fodder CASPER > Workshop discussions! :) > > Dave > > On Aug 6, 2018, at 20:25, Dan Werthimer <d...@ssl.berkeley.edu> wrote: > > > > hi john, > > how many bits do you need? > > here are some possibilities: > > a) > if 4 bits, then homin's 15 Gsps adc board might be a good choice. > > b) > if 12 bits, and you don't mind breaking the band up into 2 GHz chunks, > then this $9K RFsoc eval board has eight 12 bit 4Gsps ADC's and a big FPGA > to channelize and packetize: > https://www.xilinx.com/products/boards-and-kits/zcu111.html > > c) > if 12 bits, and you want to digitize the whole band at once, > you might consider AD's new 10.25GSps 12-bits ADC with a 6.5GHz bandwidth: > http://www.analog.com/en/products/analog-to-digital-converters/standard-adc/high-speed-ad-10msps/ad9213.html > but it's pricy, data sheet is preliminary, and i don't know if anybody has > an FMC board with this chip yet. > http://www.analog.com/en/about-adi/news-room/press-releases/2018/5-21-2018-12-bit-10-point-25-gsps-radio-frequency-adc-sets-new-performance.html >  shows the pricing as $3,652.49 in 1000 piece quantities. > > > best wishes, > > dan > > > > > > > > > > On Mon, Aug 6, 2018 at 11:13 AM, John Ford <jmfor...@gmail.com> wrote: >> >> Hi all.  We're interested in wideband moderate performance spectrometers. >> Something that can digitize 2 (or 4) polarizations at at ~ 8 to 10 GS/s, and >> provide ~4K channels, full stokes, with a moderate dump rate (1 GB/sec or >> less). >> >> We could use 8 ROACH-2/ADC-5GS VEGAS-style spectrometer blades, 2 for each >> 4 GHz polarization and sideband. (simultaneous upper and lower sidebands are >> required) >> >> Or we could move on to newer ADCs and processing boards, and get the full >> 4 GHz from each polarization in one go.  I think this is preferable, for >> many reasons. >> >> The key here, I think, is the ADCs that may have come to market (or to the >> casper community) since VEGAS was built.  I know Homin Jiang and Jonathan >> Weintroub's groups are working on wideband ADCs and integration with FPGA >> boards. >> >> So the questions that I am posing are:  What ADCs and hardware >> configuration would you choose for a minimum-effort maximum-effect project >> to be built and deployed in the near future?  What projects could we assist >> with in getting the next fast ADCs developed and tested? >> >> Is this all fodder for the CASPER workshop discussions? >> >> John >> >> -- -- You received this message because you are subscribed to the Google Groups "casper@lists.berkeley.edu" group. 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