摘要
以FPGA为核心,TFT实现图形与菜单界面,USB1.1与Delphi7.0完成与上位机接口及图形操作界面,对低频段采用时钟分段分频法,在MCU的控制下实现DDS低频高精度双通道±8V,0.02Hz～10MHz的正弦波等常规波形外,还能榆出数码流、调制信号、随机噪声、扫频信号及时域/频域自定义波形,信号参数均可步进在线可调．实验表明该设计是行之有效的,文中在介绍系统设计思想的同时,重点讲述FPGA设计、信号输入方法及提高低频段时域精度的措施等．
With FPGA used as core, TFT for figures and menu-interface, USB1.1 ＆ Delphi 7.0 for connecting with upper computer and figure work＇s interface, clock piecewise-frequency division method adopted in low-band frequency, MCU for control, a dral-channels portable type arbitrary waveform generator with high-precision was developed in DDS. Thus common waveforms such as sine wave with ± 8V voltage, frequency from 0.01Hz to 10MHz were generated, data-V HS bit-stream, modulation signals, random noise, sweeping signals, user-defined time domain or frequency domain waveform were also generated, in that signal parameters can be adjusted online step-by-step. The ideas of the system design were explained. Besides, FPGA design methods, signal input method and improvement of precision domain were discussed.
出处
《东莞理工学院学报》
2007年第1期112-115,共4页
Journal of Dongguan University of Technology
基金
湖南省自然科学基金项目(02JJY5011)
东莞市科研发展专项资金项目(2005D040)
广东省科技计划项目
关键词
信号输入法
DDS信号源
FPGA
分段分频
可视化
signal input method
DDS signal source
FPGA
piecewise-frequency division
visualization
