Very large FX correlator system for enhanced ALMA

Details Very large FX correlator system for enhanced ALMA Very large FX correlator system for enhanced ALMA

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spie.4015...64o&link_type=abstract

Proc. SPIE Vol. 4015, p. 64-72, Radio Telescopes, Harvey R. Butcher; Ed.

Computer Science

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Scientific paper

We are proposing a very large FX correlator system as an enhanced ALMA correlator. Maximum bandwidth per IF is 4096 MHz. Spectral channels per baseline per IF is 128 X 1024. The possible number of correlation is a few thousands per IF. This correlator system realizes both high spectral resolution (< 0.1 km/s at 100 GHz) and wideband (> 1000 km/s at 850 GHz) observations up to 850 GHz. We have started the design and development of a minimum test system of the very large FX correlator in order to overcome several technical issues. This test system consists of two 2-bit A/D converters and one FX spectro-correlator. This correlator system has the bandwidth of 2048 MHz, 'half' bandwidth of the final specifications. But the spectral resolving point is the same as the final one. For the A/D converter, we are now measuring the sampling performance of high-speed sample-hold circuit at the clock of 8 GHz. For the FX correlator, we have finished the coefficient error estimation for the finite word length of FFT. More than 9-bit FFT calculation will make the coefficient error less than 3%. We also apply a new function, re-quantization. It reduces the number of connection between F and X parts with almost keeping the sensitivity.

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