NDLI: High-Precision Millimeter-Wave Spectrometer: Last Improvements

Content Provider	IEEE Xplore Digital Library
Author	Alekseev, E.A. Motiyenko, R.A.
Copyright Year	2007
Description	Author affiliation: Inst. of Radio Astron., Nat. Acad. of Sci. of Ukraine, Kharkov (Alekseev, E.A.; Motiyenko, R.A.)
Abstract	It is that the wideband output spectrum of a DDS (direct digital synthesizer) contains a lot of rather intense spurious components that is why high factor multiplication (in our case it may be up to 600) of the DDS output signal usually produces too spurious spectrum. In order to overcome this obstacle we applied narrow-band adaptive filtering by means of narrow-band phase-lock loop of the klystron (its closed loop bandwidth is about 1 - 2 kHz). In order to provide wide-range continuous spectra record the klystron is equipped with special system which provides mechanical adjustment of its resonator. As it is shown in even small distortion of modulation signal leads to additional errors in the frequency determination. That is why additional improvement deals with application of direct digital synthesizers (DDS) AD9834 in the modulation system of the spectrometer. We applied two phase-shifted DDS with controlled phase shift. Application of DDS allows us to minimize distortions of modulation signal as well as to improve resolution during phase shift adjustment.
Starting Page	797
Ending Page	799
File Size	438686
Page Count	3
File Format	PDF
ISBN	1424412374
DOI	10.1109/MSMW.2007.4294818
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-25
Publisher Place	Ukraine
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spectroscopy Synthesizers Narrowband Klystrons Distortion Wideband Adaptive filters Bandwidth Frequency Digital modulation
Content Type	Text
Resource Type	Article

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