NDLI: Low phase noise microwave oscillators based on HTS shielded dielectric resonators

Content Provider	IEEE Xplore Digital Library
Author	Ghosh, I.S. Tellmann, N. Schemion, D. Scholen, A. Klein, N.
Copyright Year	2002
Abstract	To meet the specifications of future radar and communication systems we developed a low phase noise microwave oscillator. This feedback oscillator consists of a commercial MESFET-amplifier at room temperature and a LaAlO/sub 3/ dielectric resonator with high temperature superconducting (HTS) shielding at 63 K. The resonator operating at a resonance frequency of 5.6 GHz showed unloaded quality factors in the 10/sup 5/ to 10/sup 6/ range. By means of a strong resonator coupling (\|S/sub 21/\|=6 dB) and an amplifier gain of 20 dB we obtained an output power of +15 dBm. The phase noise L(f/sub m/) of the oscillator was below the detection limit for offset frequencies beyond 10 kHz. For offset frequencies below 5 kHz measurements revealed perfect L(f/sub m/)/spl prop/f/sub m//sup .3/-behaviour according to the Leeson model. The phase noise was -110 dBc/Hz at 1 kHz offset and -130 dBc/Hz at 10 kHz. This phase noise performance is superior to state of the art SAW- or quartz oscillators for f/sub m/>10 kHz. To further reduce the phase noise performance close to the carrier we investigated the implementation of a phase locked loop (PLL). The long term temperature stability of the oscillator frequency can be enhanced by introducing a central cylinder made from rutile (TiO/sub 2/). We present numerical and experimental results on this compensation.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	3071
Ending Page	3074
Page Count	4
File Size	501991
File Format	PDF
ISSN	10518223
Volume Number	7
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phase noise Microwave oscillators High temperature superconductors Frequency Temperature distribution Power amplifiers Phase locked loops Radar Feedback MESFETs
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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