The paper presents a fast agile frequency synthesizer of low spurious, low phase noise.

系统地介绍了一种低杂散、低相位噪声、快速捷变频频率合成器的实现途径。

youdao

This paper gives the design and experimental results of low noise NPLL frequency synthesizer and concludes that the passive loop filter is more suitable for low noise design than active loop filter.

介绍低相噪NPLL 频率综合器的设计及实验结果。提出用无源环路滤波器比用有源环路滤波器更好，可获得低相噪设计。

youdao

Low temperature coefficient, high precision, low noise, and good high frequency performance.

温度系数小、精度高、噪声低、高频性能好。

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Residents of Waubra, a town near Victoria's biggest wind generator, recently complained that low-frequency noise was causing headaches and earaches.

ECONOMIST: Wind energy and politics

Over the years, the government has taken steps to address the problem, including regulating low-frequency noise like water pumps, and reducing maximum decibels.

BBC: Taiwan's noise pollution dilemma

Its scientific committee said low-frequency ambient marine noise levels had increased in the northern hemisphere by two orders of magnitude over the last 60 years.

BBC: NEWS | Science/Nature | The deafening sound of the seas