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基于AD9833的信号发生器的设计与实现_272

第七届高等电子设计大赛

题目：信号发生器

小组成员：

王彬宇应用物理专业201105080107

寿网络蚂蚁怎么用耘信息工程专业201113010730

徐婷婷信息工程专业201113010828

二O一四年五月

摘要

本次设计是关于直接数字频率合成技术（DDS）的信号发生器的设计与实现。设计以DDS芯片AD9833为频率合成器，以单片机STC89C52为进程控制和任务调度中心，并采用数模转换器TLC5615和模拟乘法器AD633组成幅值调节电路，实现幅值连续可调的波形发生器的设计方案。且用LCD1602液晶显示及键盘构成人机交互模块，可通过按键切换输出的波形，使之输出不同频率和幅值的正弦波三角波和方波。该信号发生器输出的信号频率范围为100HZ~100KHZ,幅值可以在0V~5V内进行步进调节。测试表明该DDS友商网在线会计信号发生器具有工作稳定，精度高，失真度小，控制灵活的优点，具有广泛的应用前景。

ABSTRACT

This design is the design and implementation on the direct digital frequency synthesis (DDS) signal generator. AD9833 DDS chip design frequency synthesizer, a microcontroller STC89C52 for process control and mission control center, and the use of

digital-analog multiplier AD633 TLC5615 and composition of the amplitude adjustment circuit, continuously adjustable amplitude waveform generator design. And a liquid crystal display and a keyboard constituting LCD1602 HCI module, through the key switch output waveform, so that the output sine wave of varying frequency and amplitude of the triangular wave and square wave. Signal frequency range of the signal generator output to 100HZ ~ 100KHZ, stepping amplitude can be adjusted within the 0V ~ 5V. Tests show that the DDS signal generator with job stability, high accuracy, low distortion, controlled flexible benefits, has broad application prospects.

1设计要求.....................................................................................................................1

1.1任务..........................................................................................................................1

1.2跨越百年的美丽主要内容要求..........................................................................................................................1

1.2.1基本要求...............................................................................................................1

1.2.2发挥部分...............................................................................................................1

2系统方案设计与论证.................................................................................................1

2.1频率合成器的方案论证与选择..............................................................................1

2.2主控芯片的方案论证与选择..................................................................................2

2.3显示模块的方案论证与选择..................................................................................2

2.4系统总体构框图......................................................................................................2

3原理分析与系统硬件设计.........................................................................................3

3.1 STC89C52单片机最小系统...................................................................................3

英语统考3.1.1键盘接口设计.......................................................................................................3

3.1.2 LCD1602接口设计..............................................................................................4

3.2基于DDS观测值的信号发生电路设计............................................................................5

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标签：信号设计频率幅值论证

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