A wideband multirate FFT spectrometer with highly uniform response

Details A wideband multirate FFT spectrometer with highly uniform response A wideband multirate FFT spectrometer with highly uniform response

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011exa....31...59c&link_type=abstract

Experimental Astronomy, Volume 31, Issue 1, pp.59-68

Astronomy and Astrophysics

Astronomy

Radioastronomy, Spectroscopy, Polyphase Fft

Scientific paper

An integrating spectrometer based on a two-stage polyphase digital filter bank (PDFB) algorithm is described. The first PDFB operates on a time multiplexed wideband signal, with a bandwidth up to 1 GHz. The second PDFB is performed in parallel over couples of overlapping channels from the first filterbank. The design automatically deletes the unused portions of the first filterbank channels, providing a seamless, uniform channelization of the input band. The design has been implemented and tested on the VLBI DBBC platform, using a single Xilinx XC5VLX220 FPGA.

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