Hi Nimish, My suggestion is to add snapshot blocks triggered on the sync pulse directly after the FFT and after the blocks that follow it. You can then look at the signal at each stage and see at which stage that strange behavior is occurring. You can also add a "test vector generator" that puts in a known sequence and see if what comes out matches what you expect.
Glenn On Fri, Mar 15, 2013 at 3:14 PM, Nimish Sane <nimish.s...@njit.edu> wrote: > Hi all: > > I am attaching a plot for Power of two inputs vs frequency channels. As can > be seen, we have this persistent problem where some channels at the end just > do not make any sense. We suspect that there is something going wrong in the > FFT block. Has anybody seen such behavior before or can think of what may be > going wrong? > > Following are some specifications that may be useful: > Hardware: ROACH2 with KATADC. > ADC Clock: 800 MHz, > FPGA clock: 200 MHz > Toolflow: XSG 11.5 with Matlab 2009b with RHEL5.8 > Libraries: SKA > FFT green block: fft_wideband_real > FFT size: 2^13 (4096 Output channels) > > Thanks, > > Nimish > -- > Nimish Sane > > Center for Solar-Terrestrial Research > New Jersey Institute of Technology > University Heights > > Newark, NJ 07102-1982 USA > > Tel: (973) 642 4958 > > Fax: (973) 596 3617 > > nimish.s...@njit.edu
