An 8 GHz digital spectrometer for millimeter-wave astronomy

Roberto G. García; Olivier Gentaz; Maryse Baldino; Marc Torres

doi:10.1117/12.926114

24 September 2012 An 8 GHz digital spectrometer for millimeter-wave astronomy

Roberto G. García, Olivier Gentaz, Maryse Baldino, Marc Torres

Proceedings Volume 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI; 84522T (2012) https://doi.org/10.1117/12.926114
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

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).

Citation Download Citation

Roberto G. García, Olivier Gentaz, Maryse Baldino, and Marc Torres "An 8 GHz digital spectrometer for millimeter-wave astronomy", Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 84522T (24 September 2012); https://doi.org/10.1117/12.926114

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