Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004newa....9...43b&link_type=abstract
New Astronomy, Volume 9, Issue 1, p. 43-50.
Astronomy and Astrophysics
Astronomy
5
Instrumentation: Miscellaneous, Methods: Numerical
Scientific paper
We present a versatile digital autocorrelation spectrometer designed to suit the needs of HIFI, the sub-millimeter heterodyne instrument of the ESAs HSO satellite. This spectrometer will offer a set of four observing modes with different ``on-line resolution/total bandwidth'' combinations. An original architecture, based on mixed gallium arsenide and silicon technologies, allowed us to realize a 512 channel, low-power consumption and high speed correlation module. We give some details on the optimization of the design (quantization scheme, readout format) performed to fit the HSO-HIFI requirements. We also describe an approach to distortion correction which takes into account the non-rigorous adjustment of the comparison thresholds of the spectrometer's analog to digital converter. Up to now, the efficiency of a spectrometer has been described as depending only on the quantization scheme used. In this paper, we show that the efficiency varies within the spectrum and we introduce the ``spectral efficiency'', which is connected to the input signal band shape.
Belgacem M.
Cais Ph.
Caux Emmanuel
Cros Alain
Ravera Laurent
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