Du Yuanbo, Li Wenbing, Ge Yapeng, Li Hui, Deng Ke, Lu Zehuang
MOE Key Laboratory of Fundamental Physical Quantities Measurement, Hubei Key Laboratory of Gravitation and Quantum Physics, School of Physics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, People's Republic of China.
Rev Sci Instrum. 2017 Sep;88(9):096103. doi: 10.1063/1.5001489.
A high-frequency signal generator based on direct digital synthesizer (DDS) and field-programmable gate array (FPGA) is presented. The FPGA provides the controlling time sequence for the DDS, which has a highest output frequency of 1.4 GHz and a frequency resolution of 190 pHz. At an output frequency of 1.2 GHz, the measured phase noise, including the contribution of the reference clock, is -65 dBc/Hz@1 Hz, while the intrinsic phase noise is -82 dBc/Hz@1 Hz. Time delay of the DDS is measured to be less than 150 ns. The signal generator is used to drive an acousto-optic modulator, and the rise time due to the whole link is 24 ns. The developed signal generator can be used in many precision measurement experiments in the fields of atomic, molecular, and optical physics.
介绍了一种基于直接数字频率合成器（DDS）和现场可编程门阵列（FPGA）的高频信号发生器。FPGA为DDS提供控制时序，DDS的最高输出频率为1.4 GHz，频率分辨率为190 pHz。在1.2 GHz的输出频率下，测得的相位噪声（包括参考时钟的贡献）为-65 dBc/Hz@1 Hz，而固有相位噪声为-82 dBc/Hz@1 Hz。测得DDS的时间延迟小于150 ns。该信号发生器用于驱动声光调制器，整个链路的上升时间为24 ns。所开发的信号发生器可用于原子、分子和光学物理领域的许多精密测量实验。
