ISSTT Proceedings

ISSTT Proceedings

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Fast Fourier Transform Spectrometer

Authors:
B. Klein, I. Krämer, S. Hochgürtel, R. Güsten, A. Bell, K. Meyer, V. Chetik
Abstract:
We review the development of our digital broadband Fast Fourier Transform Spectrometers (FFTS). In just a few years, FFTS back-ends - optimized for a wide range of radio astronomical applications - have become a new standard for heterodyne receivers, particularly in the mm and sub-mm wavelength range. They offer high instantaneous bandwidths with many thousands spectral channels on a small electronic board (100 × 160 mm). Our FFT spectrometer make use of the latest versions of GHz analog-to-digital converters (ADC) and the most complex field programmable gate array (FPGA) chips commercially available today. These state-of-the-art chips have made possible to build digital spectrometers with instantaneous bandwidths up to 1.8 GHz and 8192 spectral channels. Our latest development step is a prototype compact FFTS board with a new 5 GHz 8/10-bit ADC and an outstanding instantaneous bandwidth of 2.5 GHz. An early version of the board has been successfully field-tested at the APEX telescope and we present a first spectrum observed in November 2008.
Categories:
Measurements & Calibration, Miscellaneous
Year:
2009
Session:
W4
Full-text:
Download a PDF of this paper.
Page Number(s):
199-201