Arcetri Technical Reports 8/2000

Possible architectures for an hybrid correlator

G. Comoretto

Osservatorio Astrofisico di Arcetri

Abstract

For the ALMA advanced correlator, an hybrid architecture has been proposed. By dividing the digitized band into several smaller sub-bands, using digital filtering, downconversion and Nyquist subsampling (decimation), one can achieve a significant reduction in the size of the correlator. Various solutions have been proposed to implement this concept. In this repost these solutons are compared, interm of performances and of required hardware, both for the signal conditioning part (antenna based) and for the correlator.

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