Affiliation:
1. School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
2. National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China
Abstract
The frequency synthesizer plays a crucial role in atomic clock technology. In this study, we demonstrate a direct microwave frequency synthesizer for a cesium atomic clock, employing frequency multiplication and a dual-phase-locked loop mode. A mathematical model of the frequency synthesis chain is established to estimate its performance. The phase-settling time and system stability are analyzed and studied in detail, and the obtained results are verified by experiments. An optimized realization of the frequency synthesizer shows that the phase-settling time can be adjusted within the range of 644.5 µs to 1.5 ms. Additionally, we measure the absolute phase noise values to be −63.7 dBc/Hz, −75.7 dBc/Hz, −107.1 dBc/Hz, and −122.5 dBc/Hz at 1 Hz, 10 Hz, 1 kHz, and 10 kHz offset frequencies, respectively.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Sichuan Province
Equipment Advance Research Field Foundation
Fundamental Research Funds for the Central Universities of China
State Key Laboratory of Advanced Optical Communication Systems Networks, China
Subject
Fluid Flow and Transfer Processes,Computer Science Applications,Process Chemistry and Technology,General Engineering,Instrumentation,General Materials Science