Arcetri Technical Reports 5/2011
Uniboard Digital Receiver Design Document
G. Comoretto(1) A. Russo(1) G. Tuccari(2) A. Baudry(3) P. Camino(3) B. Quertier(3)
(1) INAF Osservatorio Astrofisico di Arcetri
(2) INAF Istituto di Radioastronomia
(3) Université de Bordeaux 1, Laboratoire d'Astrophysique de Bordeaux (LAB)
Abstract
The Uniboard is a project for a general purpose board, containing several large FPGAs, to be used as a general component for the next generation VLBI correlator. The Digital Receiver Working package deals with the implementation of a wideband frequency demultiplexer, that divides the received radio band (up to a bandwidth of 8 GHz) into enough narrow band channels (64 MHz bandwidth or lower) to completely cover it. Each channel can be independently positioned across the input band, and may have a different bandwidth and signal representation (number of bits per sample). Output is formatted as VDIF packets, encapsulated in UDP packets routed over eight 10Gb fiber links.
The document describes the general architecture and performance of the proposed design.
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