Ivanov Eugene N, Tobar Michael E
School of Physics, University of Western Australia, Crawley, Australia.
IEEE Trans Ultrason Ferroelectr Freq Control. 2009 Feb;56(2):263-9. doi: 10.1109/TUFFC.2009.1035.
This work demonstrates that ultra-low phase-noise oscillators with a single-sideband phase-noise spectral density approaching -160 dBc/Hz at Fourier frequency of 1 kHz can be constructed at microwave frequencies (8 to 10 GHz). Such noise performance has been achieved by frequency locking a conventional loop oscillator to a temperature-stabilized sapphire dielectric resonator operating at a relatively high level of dissipated microwave power (approximately 0.5 W). Principles of microwave circuit interferometry have been employed to generate the error signal for the oscillator frequency control system. No cryogens were used. Two almost identical oscillators were built to perform the classical 2-oscillator phase noise measurements. The phase referencing of one oscillator to another was achieved by varying microwave power dissipated in the sapphire resonator.
这项工作表明，在微波频率（8至10吉赫兹）下，可以构建出单边带相位噪声谱密度在1千赫兹傅里叶频率处接近-160分贝毫瓦每赫兹的超低频相位噪声振荡器。通过将传统环形振荡器频率锁定到一个以相对较高微波耗散功率（约0.5瓦）运行的温度稳定蓝宝石介质谐振器上，实现了这样的噪声性能。微波电路干涉测量原理已被用于生成振荡器频率控制系统的误差信号。未使用低温冷却剂。构建了两个几乎相同的振荡器来进行经典的双振荡器相位噪声测量。通过改变蓝宝石谐振器中耗散的微波功率，实现了一个振荡器相对于另一个振荡器的相位参考。
