摘要
以DDS芯片AD9833为核心,以NI6229数据采集卡的数字I/O口模拟SPI总线控制AD9833,实现了1Hz到10MHz频率范围内连续正弦信号输出,分辨率达到10-5,最小步进1Hz。数据采集卡与DDS芯片AD9833的结合为轻敲式原子力显微镜探针的驱动提供了稳定精确的正弦信号源。实验证明,此设计硬件电路结构简单,软件控制灵活,输出信号频率稳定,精确。
The continuous sine signal output is implemented by applying DDS chip of AD9833 and NI6229 data acquisition card.The digital I/O ports of the NI6229 data acquisition card are simulated as the SPI bus to control AD9833.The frequency of the output sine signal is from 1Hz to 10MHz,the resolution is superior to 10-5,and the minimal step is 1Hz.The combination of the data acquisition card and DDS chip of AD9833 provides a stable and accurate sine signal for driving the probe of tapping-mode atomic force microscope.The experiment proves that the structure of hardware circuit is simple,the control of software is flexible and the frequency of outputting signal is stabilize and accurate.
出处
《工具技术》
2010年第5期103-106,共4页
Tool Engineering
基金
安徽高校省级自然科学研究重点研究项目(KJ2007A067)
国家自然科学基金项目(50975075)
