本科毕业论文设计 基于单片机的 DDS 函数信号发生器题 目： 专业名称： 学生姓名： 学生学号： 指导老师： 毕业时间： 【内容摘要】信号发生器常被用来当作信号发生源，它可以产生多种波形,如三角波、锯齿波、矩形波（含方波）、正弦波，并且各波形的幅度和频率可调，正是因为信号发生器可以产生各种波形的信号，因此在在电路实验和设备检测生产实践和科技领域中都有着广泛的应用。本系统主要包括四个部分，电源供电，单片机最小系统，DDS，显示。本系统主要用 89C52 单片机与 DDS 器 AD9833 构成的函数信号发生器，可产生方波、三角波、正弦波，可以由程序控制改波形的周期，并可以通过按钮实现不同波形切换。DDS 输出信号的幅值为 0-2.5V，频率步进 1KHz 可调，实际信号频率通过 4 位数码管显示。对于输出信号幅值的控制，主要是用 OP07 放大器对其信号放大来实现的。通过 OP07 放大器可以把 DDS 输出信号的幅值放大 2 倍，从而达到了输出波形幅值在 0-5V 变化。【关键词】：AD9833；89C52；DDS；信号发生器ABSTRACTPlacing signage at signal generator is often used as a signal, it can produce various waveform, such as triangle wave, sawtooth wave, rectangle wave (including square wave), sine wave, and the wave amplitude and frequency adjustable, it is because the signal generator can produce various waveform signal, therefore in circuit experiment and test equipment in the field of production practice and science and technology has a wide range of applications.System mainly includes four parts, power supply, single chip microcomputer minimum system, DDS conversion, display. This system mainly USES the 89 c51 and constitute of the DDS converter AD9833 function signal generator, can produce square wave, triangle wave, sine wave, can be controlled by the program to change the cycle of the waveform, and can implement different waveform by pressing the button switch. Output signal amplitude of 0-2.5 V, step 1 KHZ frequency is adjustable, the actual signal frequency t...
