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A wideband multirate FFT spectrometer with highly uniform response |
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| Authors: | Giovanni Comoretto Andrea Melis Gino Tuccari |
| Institution: | 1. INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, Firenze, Italy 2. INAF-Osservatorio Astronomico di Cagliari, Loc. Poggio dei Pini, Strada 54, Capoterra (CA), Italy 3. INAF-Istituto di Radioastronomia, Noto VLBI Station, Contrada Renna Bassa, 96017, Noto (SR), Italy |
| Abstract: | 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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