Hi Glenn, Thanks, I was being a tad blase regarding Nyquist/sampling rates. I think if we can operate at 2.5GHz BW on each channel using the ROACH-I then we should be fine - at least as a good proof of concept.
Ross On Tue, Feb 12, 2013 at 12:58 PM, G Jones <[email protected]> wrote: > Hi Ross, > One point to clarify, the 5000 refers to the samping rate, not the > total bandwidth. So a single ADC1X5000 demux 1:2 will give you 5000 > Msps at 4 bits per sample, allowing you to sample signals up to 2.5 > GHz bandwidth. With a single board, you'd need to put the board in the > mode that instead acts as two ADCs each providing 2500 Msps at 4 bits > per sample, hence you'd be able to correlate two signals each of up to > 1.25 GHz bandwidth. With two ADC cards, you could correlate two 2.5 > GHz BW signals. > > Glenn > > On Tue, Feb 12, 2013 at 3:53 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)
