HTS cavities for low phase noise oscillator applications

The origins of phase noise in oscillator systems are reviewed. A simple, self-excited 7.5 GHz oscillator incorporating either a conventional metal cavity resonator or a high temperature superconducting (HTS) cavity has been produced. Comparative measurements made at 77 K demonstrate significant impr...

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Veröffentlicht in:	IEEE transactions on applied superconductivity 1997-06, Vol.7 (2), p.3064-3066
Hauptverfasser:	Button, T.W., Smith, P.A., Alford, N.M., Greed, R.B., Adams, M.J., Nicholson, B.F.
Format:	Artikel
Sprache:	eng
Schlagworte:	1f noise Applied sciences Atmospheric measurements Bandwidth Cavity resonators Circuit noise Circuit properties Electric, optical and optoelectronic circuits Electronics Exact sciences and technology High temperature superconductors Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits Noise measurement Oscillators Phase noise Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Superconducting device noise Superconducting devices
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Beschreibung
Zusammenfassung:	The origins of phase noise in oscillator systems are reviewed. A simple, self-excited 7.5 GHz oscillator incorporating either a conventional metal cavity resonator or a high temperature superconducting (HTS) cavity has been produced. Comparative measurements made at 77 K demonstrate significant improvements in the close-to-carrier noise performance of the oscillator incorporating the HTS cavity; 10 dB at a 10 kHz offset rising to more than 25 dB at a 10 Hz offset. The unloaded Q of the HTS cavity doubled to >10/sup 6/ on cooling from 77 K to 64 K suggesting that further improvements in noise performance could be achieved.
ISSN:	1051-8223 1558-2515
DOI:	10.1109/77.621979