期刊
JAPANESE JOURNAL OF APPLIED PHYSICS
卷 47, 期 9, 页码 7390-7392出版社
IOP PUBLISHING LTD
DOI: 10.1143/JJAP.47.7390
关键词
cryogenic sapphire resonator; frequency stability; frequency synthesizer; microwave oscillator; reference signal; hydrogen maser
We describe a 1 GHz reference signal with 10(-15) level fractional frequency stability for averaging times longer than 1s, synthesized from a 10.8 GHz oscillation frequency of a cyrogenic-sapphire-resonator-based ultra-stable oscillator and phase locked to a hydrogen maser with a time constant of about 1000s. The degradation of the short term stability of the reference signal by phase locking to the hydrogen maser was evaluated. We also report on the implementation of the 1 GHZ signal down converted to 5 MHz as a reference oscillator for a cesium atomic fountain frequency standard.
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