Hi Nikitha, Are the sampling clocks given to the adc from the same source? If you're giving from a different source, please check if both are synchronised. Then the 1pps signal can be independently be used to find the delay in the electronics and can be corrected for using delay blocks on the FPGA.
Regards, Mugundhan On Tue 26 Nov, 2019 13:25 'Nikita Rathore' via [email protected], < [email protected]> wrote: > Dear Casperites, > > I am trying to make a 4-element interferometer at L-band (bandwidth 300 > MHz) on a ROACH2 Board which has 2 x 5Gsps (ASIAA) ADC boards. I > successfully compiled and tested a 2-element interferometer, through drift > scans of the sun, and it yields fringes as expected. > > However, I have not been able to replicate these fringes with a 4-element > design, so I started testing a 2-element correlator using two different > ADCs on the same ROACH2. I was earlier using a software synchronization, as > suggested in the tutorial. > > Could you please guide me on how to synchronize the two cross ADC of the > same ROACH2 Board so they can be in sync with the FPGA clock (150MHz) which > is taken from one of the ADC clocks (adc0 in my case). We have used two > ADC1x5000-8 of the board for the experiment. We noticed the two sync port > on the Board and as mentioned on the Casper site we had synchronized our > ADC by 1pps signal and also by software. I have attached the results. > > My question is how to synchronize these two ADC by a pps signal and also > do we need to synchronize the cross ADC of the same Board when working for > correlator. In my case, I had the same results for synchronized and > unsynchronized ADC. > Synchronization of two cross ADC > <https://docs.google.com/a/iiti.ac.in/document/d/1fdzVWFTYx55IftxvvgSxvJfFk9x1Q89-Gum2iukoVpo/edit?usp=drive_web> > > > -- > Nikita Rathore > Junior Research Fellow > Discipline of Astronomy, Astrophysics & Space Engineering (DAASE) > Indian Institute of Technology, Indore > > -- > 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 view this discussion on the web visit > https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/CAOvmUY5%3D9XcjrDBigY4Gz2TkxeCONcZA2dciTeRgE%3DVbeqBB0Q%40mail.gmail.com > <https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/CAOvmUY5%3D9XcjrDBigY4Gz2TkxeCONcZA2dciTeRgE%3DVbeqBB0Q%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- 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 view this discussion on the web visit https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/CAD560xn0AkOn4%2B%2BcWo9jwhw1g5332kjMKhjh%3DA6967qq5ENU%2BQ%40mail.gmail.com.
