中圖分類號： TB939
文獻標識碼： A
DOI：10.16157/j.issn.0258-7998.200805
中文引用格式： 王淼兒，姚燕. 一種CPT銫原子鐘控制系統的設計[J].電子技術應用，2020，46(12)：57-60，66.
英文引用格式： Wang Miaoer，Yao Yan. Design of control system for a CPT Cesium atomic clock[J]. Application of Electronic Technique，2020，46(12)：57-60，66.

Design of control system for a CPT Cesium atomic clock

Abstract： The realization of coherent population trapping(CPT) atomic clock with miniaturized, low-power is of great significance for its applications in the fields of precision measurement such as communication and position. The peripheral circuit controlling accurate frequency and laser output is the key technology to achieve coherent population trapping atomic clock. A peripheral control system of CPT Cesium atomic clock is developed in this paper. The system uses two levels for fine-tuning and coarse-tuning to drive the VCSEL laser to work, which is more accurate than single current adjustment and uses phase-locked loop circuit to generate modulated microwave signal. PIN diodes are used to adjust the microwave power attenuation in order to realize the adjustment of microwave power. In the meanwhile, software modulation and demodulation methods is applied to replace traditional hardware modulation and demodulation circuits, which saves circuit logic resources.The testing results show that the output of the microwave power reaches -3.33 dBm when the microwave frequency is 4.596 267 GHz. The phase noise of the radio frequency circuit is better than -80 dBc/Hz under the frequency offset of 1 kHz which has better capability.

Key words : coherent population trapping；atomic clock；control system；modulation and demodulation；phase noise