Computer Science
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986rasc...21..437p&link_type=abstract
Radio Science (ISSN 0048-6604), vol. 21, May-June 1986, p. 437-446.
Computer Science
2
Analog To Digital Converters, Bits, Broadband, Correlators, Multipliers, Radio Interferometers, Memory (Computers), Systems Engineering, Tolerances (Mechanics)
Scientific paper
The design details for a 768-Mbit/s single bit digital by analog correlator for a wideband interferometer system are given. Design tolerances for a high-speed 1-bit digitizer realized using several lower speed converters are presented, and it is shown that the arrangement may be extended to 1200 Mbits/s if a 5 percent loss in sensitivity can be tolerated. A variable path compensating delay using a high-speed cyclic memory is described. The operation of a 1-bit by analog multiplier is considered in detail and design tolerance for this device are also presented. The measured sensitivity of the correlator, relative to that of a perfect analog system, is 0.77 + or - 0.02, which compares well with the predicted value of 0.78. The correlator has been used with the 76-m Mk 1A and 26-m MK II radio telescopes at Jodrell Bank to provide a high-sensitivity, single-baseline interferometer.
Davis Raymond Jr.
Padin Stephen
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