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Proceedings Paper

An 8 GHz digital spectrometer for millimeter-wave astronomy
Author(s): Roberto G. García; Olivier Gentaz; Maryse Baldino; Marc Torres
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Paper Abstract

We have designed and tested a digital spectrometer suitable for analyzing 8 GHz baseband signals. It is based on a 16- Gsps, 5-bit ADC from e2v and a Stratix-IV FPGA employed for later filtering and signal processing. Digitized data is received and synchronized via twenty high-speed 4-Gbps transceivers integrated in the FPGA. A 64-channel polyphase filter bank separates the input signal into 250-MHz sub-bands, allowing subsequent high-resolution analysis. To obtain continuous spectral information over the input bandwidth, we have implemented a 50% overlapping architecture solution. Subsequently these sub-bands are processed using Fast Fourier Transform modules. This system meets present-day demands on high-resolution wideband digital back-ends for millimeter-wave telescopes. This technology will be part of the next generation wideband correlator for the future upgrade of the IRAM Plateau de Bure interferometer (NOEMA project).

Paper Details

Date Published: 24 September 2012
PDF: 8 pages
Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 84522T (24 September 2012); doi: 10.1117/12.926114
Show Author Affiliations
Roberto G. García, Institut de Radioastronomie Millimétrique (France)
Olivier Gentaz, Institut de Radioastronomie Millimétrique (France)
Maryse Baldino, Institut de Radioastronomie Millimétrique (France)
Marc Torres, Institut de Radioastronomie Millimétrique (France)

Published in SPIE Proceedings Vol. 8452:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI
Wayne S. Holland, Editor(s)

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