Title :
A decimation filter for a very large band signal in radioastronomy
Author :
Camino, P. ; Dallet, D. ; Quertier, B. ; Baudry, A. ; Comoretto, G. ; Le Gal, B.
Author_Institution :
Univ. of Bordeaux, Floirac
Abstract :
This study was initiated in the frame of the 2-stage, 32-demultiplexed input digital filter of the large correlator system of the ALMA (Atacama Large Millimeter Array) interferometer project. The main goal of this work was to reduce the power consumption of the implemented architecture in large FPGAs by optimizing the amount of logic elements. A modified structure of the CIC (cascaded integrator comb) filter for a time demultiplexed architecture is investigated. Different implementations are discussed and compared in terms of performances (complexity, power consumption). We demonstrate that a multistage architecture significantly improves the power dissipation.
Keywords :
comb filters; correlation methods; demultiplexing; digital filters; field programmable gate arrays; radioastronomy; radiowave interferometers; ALMA project; Atacama large millimeter array interferometer project; FPGA; cascaded integrator comb filter; correlator system; decimation filter; power dissipation; radioastronomy; time demultiplexed architecture; very large band signal; Analog-digital conversion; Band pass filters; Correlators; Digital filters; Field programmable gate arrays; Filter bank; Filtering; Finite impulse response filter; Passband; Signal processing;
Conference_Titel :
Research in Microelectronics and Electronics Conference, 2007. PRIME 2007. Ph.D.
Conference_Location :
Bordeaux
Print_ISBN :
978-1-4244-1000-2
Electronic_ISBN :
978-1-4244-1001-9
DOI :
10.1109/RME.2007.4401863
