Encai Zhong, Yan Zheng, Jinxu Hong, Mingming Liu, Yijun Luo, Hongli Liu, Ke Deng, Jie Zhang, Zehuang Lu
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引用次数: 0
Abstract
Precision measurement experiments require high-performance frequency references that have ultra-low phase noise and excellent frequency stability. In conjunction with phase noise cancellation and frequency synthesis technologies, we expect cryogenic sapphire oscillators to serve as microwave frequency references. To this end, we employed a cryogenic sapphire filter to reduce the phase noise of the cryogenic sapphire oscillator, thereby achieving the generation of a 10.798 GHz microwave signal with ultra-low phase noise of up to -165 dBc/Hz at an offset frequency of 1 MHz. Furthermore, to take full advantage of the excellent frequency stability, we designed a frequency conversion chain generating reference frequencies at 9 GHz, 100 MHz, and 10 MHz, achieving fractional frequency stability in the low 10-15 range for integration times between 100 and 1000 s. Such a signal source can become the frequency reference of choice for many scientific applications.
期刊介绍:
Review of Scientific Instruments, is committed to the publication of advances in scientific instruments, apparatuses, and techniques. RSI seeks to meet the needs of engineers and scientists in physics, chemistry, and the life sciences.