Hi Dan and Glenn, All sounds good - I think have the ROACH-1 design will help us out a lot here to get started. We really don't need a very high spectral response as we are just trying to measure the amplitude and phase of a PSFs wings referenced to the central core of the PSF.
Cheers, Ross On Tue, Feb 12, 2013 at 1:05 PM, G Jones <[email protected]> wrote: > Note that the design Dan is referring to currently has only been > tested to ~1.5 GHz BW. Getting to higher bandwidths will likely > require some work to meet timing. Also the data comes out over 10 > gigabit Ethernet so requires something to catch the data. > > On Tue, Feb 12, 2013 at 4:02 PM, Dan Werthimer <[email protected]> > wrote: > > > > hi ross, > > > > how many frequency channels do you need in your two input correlator? > > > > we have a full stokes VEGAS 1K channel spectrometer design > > that uses a pair of ADC08-5000's. > > (a full stokes spectrometer is the same thing as a two input correlator) > > > > our current design is for roach2, but we had tested working designs > > for roach1 last year, and we can probably dig these up. > > > > best wishes, > > > > dan > > > > > > On Tue, Feb 12, 2013 at 12:53 PM, Ross Williamson > > <[email protected]> wrote: > >> > >> Hi All, > >> > >> I'm new to CASPER/ROACH boards and so apologies if this is obvious. We > >> are hoping to build a simple 2-channel correlator with a fairly high > >> bandwidth. We are in the process of ordering a ROACH-1 board and I was > >> thinking of also purchasing the ADC1X5000-8 ADC - A few questions: > >> > >> 1) Should I even be looking at an ADC1X5000-8 for use as a correlator? > >> 2) I believe I need the DMUX 1:2 version to work with ROACH-1 board - is > >> that correct? > >> 3) I should be able to run 2 channels at 2.5GHz 4bits with a single > board > >> - correct? > >> 4) If I wanted to could I purchase another ADC1X5000-8 and try and run > >> with 5GHz bandwidth on each channel using the ROACH-1? > >> > >> Best regards, > >> > >> Ross > >> > >> -- > >> Ross Williamson > >> Research Scientist - Sub-mm Group > >> California Institute of Technology > >> 626-395-2647 (office) > >> 312-504-3051 (Cell) > > > > > -- Ross Williamson Research Scientist - Sub-mm Group California Institute of Technology 626-395-2647 (office) 312-504-3051 (Cell)
