基于DDS的8通道同步宽带信号源设计  

Design of a DDS Based 8-Channel Synthesized Wideband Signal Generator

作　　者：李冰[1] 杨其华[1] 刘钢海[1] 

机构地区：[1]中国计量学院机电工程学院

出　　处：《电子技术（上海）》2008年第12期33-36,共4页Electronic Technology

基　　金：国家十五重大专项(2002AA2Z2011)资助项目

摘　　要：介绍了一种利用单片机控制技术的8通道同步宽带信号源设计方法,该信号源可用于产生三维空间平面内旋转磁场,以满足多相位复杂生物系统试验和新型生物芯片及传感器的开发。8通道可调相位的高精度频率信号源由DDS芯片AD9959发生。多片DDS芯片同步后,在标准50Ω负载下,经过三级放大实现100Hz～100MHz带宽输出,并通过引入幅值检测和相位同步控制负反馈,实现变负载后信号源稳频、稳幅和恒相位差输出。An 8-channel synthesized wideband signal generator,controlled by MCU is introduced. This is mainly used to generate rotating magnetic field in three dimensions,in order to satisfy multi-phase complicated biological system experiments and the exploitation of new biochips and transmitters.Eight-channel high precision frequency signals are generated by DDS chip AD9959,Since multi-DDS chips synchronized,via three-stage amplifiers these signals output within 100Hz～100MHz bandwidth at 50Ωload.Via amplitude and phase detection feedback,the output frequency,amplitude and phase discrepancies among multiple channels can be stabilized even if load is changeable.

关 键 词：DDS 宽频域范围 多片DDS芯片同步 幅度相位检测 

分 类 号：TN74[电子电信—电路与系统]