Hi Sharat, Are you running the adc mmcm calibration routine after programming your roach?
Cheers, Jack On 31 August 2015 at 22:41, sharat varma <va...@hku.hk> wrote: > > Hi Casper, > > I am working as a post-doc working under guidance of Dr. Hayden So at The > University of Hong Kong. > > We are using ROACH2 to capture data from optical cytometry. We are using > ASIAA ADC5G ADC to capture data at 4 to 5 Gsps. > > We basically use the following parameters. > > Block parameter: two-channel, ZDOK0, demux 1:1 . > System: roach2, clock source:adc0_clk, clock rate: 300 MHz. > > We are connecting the output of a photo-detector 1544-B from Newport Corp > (the spec is attached) to the ADC input using SMA. > We find that noisy spikes are introduced when we capture the data through > the ADC (see attached fig). We double checked if the source had problems > using a oscilloscope, but on the oscilloscope we do not see any of these > spikes. > > We would be grateful if you could let us know if we are doing anything > wrong. > > Rgards, > Sharat > > >
