【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±8 V,0.01 Hz～10 MHz正弦波等常规波形外,还能输出数码流、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,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。更多还原

【Abstract】 A MCU control high-precision portable dual-channels DDS arbitrary waveform generator has been developed.FPGA used as core,TFT for graphic and menu-interface,USB1.1 & Delphi7.0 were used for connecting with upper computer and graphical user interface(GUI).Clock piece wise-frequency division method was used in low frequency band.It can generate common waveforms,such as ±8V voltage sine wave with frequency from 0.01 Hz to 10 MHz,as well as data-VHS bit-stream output,modulation signals,random noise,sweeping signals,and user-defined time or frequency domain waveform can also be generated.Signal parameters can be adjusted step-by-step in-system.Experiments showed that the design was effect.Along with introduction of the system design ideas,this paper focuses on methods of FPGA design,signal input and improvement of time domain precisions of low frequency band.更多还原