[casper] building 300-receiver channel cross-correlator

Anyone help? I'm working in academia and need to build a 300-receiver channel single-bit digitiser / cross-correlator with a single frequency channel having a bandwidth of 300 MHz, centre frequency ~3 GHz. The single bit digitisers sample I giving a total data rate of 180 Gbps and using XOR

Re: [casper] building 300-receiver channel cross-correlator

Hi Neil, A bit more information would be useful, but it sounds like if you could construct a ZDOK card that interfaced some (40, one per differential pair?) of your digitizers to a ROACH board you could use a handful of ROACH boards to perform all of the cross multiplication and accumulation and

Re: [casper] building 300-receiver channel cross-correlator

> Anyone help? > > I'm working in academia and need to build a 300-receiver channel > single-bit digitiser / cross-correlator with a single frequency channel > having a bandwidth of 300 MHz, centre frequency ~3 GHz. The single bit > digitisers sample I giving a total data rate of 180 Gbps and

Re: [casper] building 300-receiver channel cross-correlator

Jack, Thanks for help. Do you have any idea of the I/O capacity of a single Roach2 board – just trying to figure out how many I may need? Thank you, Neil From: Jack Hickish [mailto:jackhick...@gmail.com] Sent: 18 December 2015 15:08 To: James Smith; Neil Salmon Cc: casper@lists.berkeley.edu

Re: [casper] building 300-receiver channel cross-correlator

hi neil, as john pointed out, you can use the differential inputs of an FPGA as a 1 bit ADC if you'd like. there's a nice write up on this by paul horowitz and his students who used xilinx fpga's as adc's. if you want to use the fpga as the digiitzers, you will need 600 LVDS inputs at 300 Msps,

Re: [casper] building 300-receiver channel cross-correlator

John, yes sample rate is 300 Msps on both I & Q sections, ie total 600 Msps per channel, a massive rate when you've got 300 channels. As I understand if you put a comparator in front to the FPGA serial link it cleans up the digitisation. But no I don't yet have these. I need to get the basic

Re: [casper] building 300-receiver channel cross-correlator

Thank you for your response. The system is part of a generic microwave/mm-wave aperture synthesis imaging system, so there’s an array of front-end heterodyne receivers with an IF earmarked at a centre frequency of 3 GHz (away from Wifi mobile comms), but the bandwidth is 300 MHz. Front-end

Re: [casper] building 300-receiver channel cross-correlator

Hi Neal, Some of this may be obvious to you, but I pass it along for what it's worth. Please pardon my ASCII. I'd like this to make it through people's spam filters! As I'm sure you're aware, the general approach to correlating many antennas together tends to favor a triangular

Re: [casper] building 300-receiver channel cross-correlator

Hello Neil, CASPER tools could probably do what you're looking for, but I found your description a bit confusing. You're going to need to clarify somewhat. Regards, James On Fri, Dec 18, 2015 at 4:15 PM, Neil Salmon wrote: > Anyone help? > > > > I’m working in academia