Ultralow phase noise Crystal Oscillators and Atomic Clocks

参考振荡器和时钟是几乎所有电子系统以及消费和专业产品中必不可少的元素，因为这些振荡器的相位噪声，抖动和稳定性通常设定了最终性能极限。高性能振荡器，表现出低相位噪声，需要在通信，控制，雷达和导航系统，也作为原子钟，光学钟，加速器和超长基干涉测量（VLBI）系统的飞轮振荡器。本研究的目的是开发新的超低相位噪声紧凑型晶体振荡器，其短期和长期稳定性得到改善，相位噪声（100 MHz）在100 Hz偏移时显著低于-140dBc，低噪声底，对于5和10MHz振荡器，相位噪声在1Hz （5MHz）和1Hz （10MHz）时低于-130dBc， ADEV（5和10MHz）低于10-13，从0.1秒到数百秒。目标是开发具有低噪声系数、超低残余闪烁噪声、精确限制和控制谐振腔功率以及优异温度稳定性的新型放大器。另一个关键特点是通过开发新的高度稳定的温度控制回路，更精确地控制热流和精确设置晶体谐振器的翻转温度，从而提高长期频率稳定性。研究低相位噪声电子频率调谐。这些振荡器将用于原子钟，以提高短期和长期的频率稳定性。参与约克大学这项研究工作的公司和研究机构包括：Keysight、Teledyne-e2V、Leonardo、Daresbury研究实验室和国家物理实验室。

Reference oscillators and clocks are essential elements in almost all electronic systems and consumer and professional products as the phase noise, jitter and stability of these oscillators usually sets the ultimate performance limit. High performance oscillators, exhibiting low phase noise, are required in communications, control, RADAR & navigation systems & also as flywheel oscillators for atomic clocks, optical clocks, accelerator & Very Long Base Interferometry (VLBI) systems. The aim of this research is to develop new ultralow phase noise compact crystal oscillators with improved short and long term stability with phase noise (at 100 MHz) significantly below -140dBc at 100 Hz offset, low noise floors and for 5 and 10MHz oscillators phase noise below -130dBc at 1Hz (5MHz) and -123dBc at 1Hz (10MHz) and ADEV (5 and 10MHz) below 10-13 from 0.1 sec to many hundreds of seconds. The aim is to develop new amplifiers which offer low noise figure, ultralow residual flicker noise, accurate limiting and control of resonator power and excellent temperature stability. An additional key feature is to improve the longer-term frequency stability by developing new highly stable temperature control loops with more accurate control of heat flow and accurate setting of the turnover temperature of the crystal resonator. Low phase noise electronic frequency tuning will be investigated.These oscillators will then be used in atomic clocks to improve both the short and long term frequency stability.Companies and research organization involved with this research work at York include: Keysight, Teledyne-e2V, Leonardo, Daresbury Research Laboratories and NPL.