Arcetri Astrophysical Observatory

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logosmallarcetri Arcetri Technical Reports 1/2011


A 512 Mhz Polyphase Filterbank with overlapping bands 

A. Melis(1), G.Comoretto(2)

(1) INAF Osservatorio Astronomico di Cagliari
(2) INAF Osservatorio Astrofisico di Arcetri

Sommario

The polyphase filterbank(PFB) algorithm is an efficient way to implement a uniformly distributed multi-channel filterbank  using a Fast Fourier Transform, in order to reduce the necessary clock frequency to process the acquired samples into an FPGA. The simplest implementation of a PFB produces adjacent bands with small holes between the sub-bands; to overcome this problem,  a PFB with overlapping bands  is one of the best solutions.

In this report a PFB with a particular overlapping channel algorithm is described. The system has been implemented into the dBBC system, based on a Xilinx FPGA Virtex 5 LX220.

Pdf version of this report