论文部分内容阅读
高性能的数据通信系统中要求内部频率源拥有较高的输出频率和分辨率,较小的杂散噪声干扰。本文基于AD9858芯片提出了一种新颖的小型化本振信号源设计方法。该设计以DDS+PLL的工作方式,将DDS置于锁相环反馈分频回路中,集成了DDS和PLL的双重优点,满足了高分辨率输出,低噪声的设计要求。论文给出了系统设计的具体流程和工作模型,经过工程验证,结果表明该设计方法正确,满足系统工作要求,具有很强的工程实用价值。
High-performance data communications systems require internal frequency sources with higher output frequency and resolution, less spurious noise. This paper presents a novel design method of miniaturized local oscillator signal source based on AD9858 chip. The design to DDS + PLL mode of operation, the DDS placed PLL feedback divider loop, integrating the dual advantages of DDS and PLL, to meet the high-resolution output, low noise design requirements. The paper gives the specific process and working model of the system design. After engineering verification, the results show that the design method is correct and meets the requirements of the system work, and has strong engineering practical value.