Boudot R, Li M D, Giordano V, Rolland N, Rolland P A, Vincent P
Institut FEMTO-ST, UMR 6174 CNRS, 32 av. de l'Observatoire, 25044 Besançon Cedex, France.
Rev Sci Instrum. 2011 Mar;82(3):034706. doi: 10.1063/1.3567010.
This paper describes a 4.596 GHz frequency synthesis based on a 2.1 GHz solid mounted resonator (SMR) voltage-controlled oscillator (VCO). The SMR oscillator presents a chip size lower than 2 mm(2), a power consumption of 18.2 mW, and exhibits a phase noise of -89 dBc/Hz and -131 dBc/Hz at 2 kHz and 100 kHz offset frequencies, respectively. The VCO temperature-frequency dependence is measured to be -14 ppm∕°C over a range of -20°C to 60°C. From this source, a low noise frequency synthesizer is developed to generate a 4.596 GHz signal (half of the Cs atom hyperfine transition frequency) with a phase noise of -81 dBc/Hz and -120 dBc/Hz at 2 kHz and 100 kHz from the carrier. The frequency synthesis output is used as a local oscillator in a Cs vapor microcell-based compact atomic clock. Preliminary results are reported and discussed. To the authors knowledge, this is the first development of a SMR-oscillator-based frequency synthesizer for miniature atomic clocks applications.
本文介绍了一种基于2.1 GHz固态安装谐振器（SMR）压控振荡器（VCO）的4.596 GHz频率合成器。该SMR振荡器芯片尺寸小于2平方毫米，功耗为18.2毫瓦，在2 kHz和100 kHz偏移频率下的相位噪声分别为-89 dBc/Hz和-131 dBc/Hz。在-20°C至60°C的温度范围内，测得VCO的温度-频率依赖性为-14 ppm/°C。基于此源，开发了一种低噪声频率合成器，以产生4.596 GHz信号（铯原子超精细跃迁频率的一半），在距载波2 kHz和100 kHz处的相位噪声分别为-81 dBc/Hz和-120 dBc/Hz。频率合成输出用作基于铯蒸汽微腔的紧凑型原子钟中的本地振荡器。报告并讨论了初步结果。据作者所知，这是首次开发用于微型原子钟应用的基于SMR振荡器的频率合成器。
