摘要
针对目前测量分析、弱信号检测的需求,以STM32F107和AD9958为核心实现了一种高分辨率幅度、频率、相位的双路信号源。首先对直接数字合成(Direct Digital Synthesis,DDS)工作原理进行介绍,重点分析了杂散的主要来源,并设计LC椭圆低通滤波器对杂散进行抑制。设计输出电路使信号源满足低频需求,并可直接用于驱动负载。最后采用STM32F107和VC6.0搭建了配置平台,对信号源波形灵活控制。
Aiming at the demands of measurement analysis and detection of weak signals,a dual-channel signal source with high-resolu-tion amplitude,frequency and phase is realized based on STM32F107 and AD9958.After introducing the working principle of Direct Digital Synthesis （DDS）,the paper analyzes main source of the stray and deals with the problem by designing LC elliptic low-pass filter. Then the output circuit is designed to satisfy the low frequency signals and the circuit can be used to drive the loads.The configurable platform is built based on STM32F107 and VC6.0 so as to realize the convenient control of the source waveforms.
出处
《单片机与嵌入式系统应用》
2014年第10期37-40,共4页
Microcontrollers & Embedded Systems
