Hi all. Thanks for the information. I'll try and digest it! John
On Mon, Aug 6, 2018 at 6:48 PM, Homin Jiang <[email protected]> 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 <[email protected]> > 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 <[email protected]> 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 <[email protected]> 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 > >> "[email protected]" group. > >> To unsubscribe from this group and stop receiving emails from it, send > an > >> email to [email protected]. > >> To post to this group, send email to [email protected]. > > > > > > -- > > You received this message because you are subscribed to the Google Groups > > "[email protected]" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [email protected]. > > To post to this group, send email to [email protected]. > > > > <ad9213.pdf> > > > > -- > > You received this message because you are subscribed to the Google Groups > > "[email protected]" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [email protected]. > > To post to this group, send email to [email protected]. > -- You received this message because you are subscribed to the Google Groups "[email protected]" group. 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