DocumentCode :
1149484
Title :
High spectral purity microwave oscillator: design using conventional air-dielectric cavity
Author :
Gupta, Amitava Sen ; Howe, David A. ; Nelson, Craig ; Hati, Archita ; Walls, Fred L. ; Nava, Jose F.
Author_Institution :
Nat. Phys. Lab., New Delhi, India
Volume :
51
Issue :
10
fYear :
2004
Firstpage :
1225
Lastpage :
1231
Abstract :
We report exceptionally low PM noise levels from a microwave oscillator that uses a conventional air-dielectric cavity resonator as a frequency discriminator. Our approach is to increase the discriminator´s intrinsic signal-to-noise ratio by use of a high-power carrier signal to interrogate an optimally coupled cavity, while the high-level of the carrier is suppressed before the phase detector. We developed and tested an accurate model of the expected PM noise that indicates, among other things, that a conventional air-dielectric resonator of moderate Q will exhibit less discriminator noise in this approach than do more esoteric and expensive dielectric resonators tuned to a high-order, high-Q mode and driven at the dielectric´s optimum power.
Keywords :
cavity resonators; dielectric resonator oscillators; discriminators; microwave oscillators; phase detectors; phase noise; PM noise levels; carrier suppression; conventional air-dielectric cavity resonator; dielectric optimum power; discriminator noise; discriminators intrinsic signal-noise ratio; frequency discriminator; high-power carrier signal; optimally coupled cavity; phase detector; spectral purity microwave oscillator; Detectors; Dielectrics; Microwave oscillators; Noise level; Phase detection; Phase noise; Resonance; Resonant frequency; Temperature sensors; Whispering gallery modes;
fLanguage :
English
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-3010
Type :
jour
DOI :
10.1109/TUFFC.2004.1350949
Filename :
1350949
Link To Document :
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