Volume 442, Number 2, November I 2005
|Page(s)||767 - 773|
|Published online||07 October 2005|
A broadband FFT spectrometer for radio and millimeter astronomy
Institute of Astronomy, ETH, 8092 Zurich, Switzerland e-mail: email@example.com
2 Acqiris SA, 1228 Plan-les-Ouates, Switzerland
3 University of Applied Sciences Solothurn, Nordwestschweiz, Switzerland
4 ZMA, Center for Microelectronics, University of Applied Sciences Aargau, Nordwestschweiz, Switzerland
Accepted: 4 July 2005
The core architecture, tests in the lab and first results of a Fast Fourier Transform (FFT) spectrometer are described. It is based on a commercially available fast digital sampler (AC240) with an on-board Field Programmable Gate Array (FPGA). The spectrometer works continuously and has a remarkable total bandwidth of 1 GHz, resolved into 16 384 channels. The data is sampled with 8 bits, yielding a dynamic range of 48 dB. An Allan time of more than 2000 s and an SFDR of 37 dB were measured. First light observations with the KOSMA telescope show a perfect spectrum without internal or external spurious signals.
Key words: instrumentation: spectrographs / methods: observational / techniques: spectroscopic / submillimeter / radio lines: stars / radio lines: general
© ESO, 2005
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