多用信号发生器系统设计(论文+答辩）

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摘要 [资料来源：THINK58.com]

信号发生器在动态测试领域有重要的作用。各种波形曲线均可以用三角函数方程式来表示。能够产生多种波形,如三角波、锯齿波、矩形波（含方波）、正弦波的电路被称为函数信号发生器。函数信号发生器在电路实验和设备检测中具有十分广泛的用途。函数信号发生器是是由基础的非正弦信号发生电路和正弦波形发生电路组合而成。本设计应用晶体管、运放IC等通用器件制作了简单易行的一套信号发生器电路，可以正确输出三角波、方波和正弦波等波形。设计中在原有方波，三角波和正弦波的电路基础上增加一级放大器，以实现输出电压的可调和，输出阻抗为50Ω。试验结果显示，通过调试可以正确显示所需要的波形，并利用仿真软件Maltose画出电路图，做出PCB布线图。结果显示，它们的功能较少，精度不高，频率上限只有300kHz，无法产生更高频率的信号，调节方式也不够灵活，频率和占空比不能独立调节，二者又互相影响。 
最后简单介绍了以ICMAX038集成芯片为核心采用MCU微处理器控制程控继电器和数字电位器设计的多功能信号发生器。该发生器能够输出方波、正弦波和三角波并能实现频段选择和频段内频率微调，同时还可以作为频率计测频率。函数信号的产生由MAX038和外围电路完成，能产生1Hz-20MHz的波形。波形选择由单片机完成，输出或输入频率经74HC390分频后，由单片机完成自动频率检测显示。该信号发生器克服了上述信号发生器的不足。

关键词 信号发生器；运算放大器；ICMAX038 
Multi-functional Signal Generator
Abstract

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Signal generator in the field of dynamic testing has an important role. Various wave curves can be used to express trigonometric equation. Can produce a variety of waveform, such as triangular wave, saw tooth, rectangle wave (including square), and the sine wave function of the circuit known as the signal generator. Function signal generator circuit in the experiments and test equipment in a very wide range of uses. Yes function signal generator from the basis of non-sinusoidal signal circuits and sine-a combination of a circuit. The design of transistors, Wan Fang IC devices such as GM produced a simple set of signal generator circuit; the output can be right triangle, square and sine wave, and so on. The design of the Original Square, triangular and sine-wave circuit on the basis of an increase in amplifiers to achieve the adjustable output voltage and output impedance of 50 Ω. The results showed that, through commissioning can correct the necessary waveforms and use simulation software Maltose draw schematics, PCB wiring pattern made. The results showed that less of their functions, accuracy is not high, only limit the frequency 300 kHz, unable to generate a higher frequency signal, the lack of regulation means a flexible, frequency and duty cycle can not be independent regulation, they also affect one another.

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The integrated chip design to ICMAX038 MCU used as the core microprocessor-controlled digital program-controlled relays and potential design of the multi-purpose signal generator can output square-wave, sine wave and triangular wave band and can achieve within the frequency band options and fine-tuning. The signal generator can produce sine, square, triangular wave. At the same time can be measured as the frequency of frequency. Function of the signal generated by the MAX038 and the completion of the external circuit, can produce 1 Hz-20MHz waveforms. Waveform choose from SCM completed, the output or input frequency by 74 HC390-frequency, SCM completed by frequency automatically detected.

Keywords signal generator；operational amplifiers；ICMAX038

目录 
摘要 I
Abstract II

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第1章 绪论 1
1.1课题背景 1
1.1.1 多用信号发生器在现代科技中的运用 1
1.1.2信号发生器的发展前景 4
1.2信号发生器的国内外现状 5
1.3设计要求指标 6
第2章 理论概述 7
2.1 2.1信号发生器的设计方案 7
2.2电路设计 7
2.2.1方波发生器 7
2.2.2三角波发生器 9
2.2.3正弦波发生器 11
2.3本章小结 14
第3章 电路设计和元件器选择 15
3.1电路图设计 15
3.2元器件及参数选择 16
3.2.1方波信号发生器电路元器件及参数选择 16
3.2.2三角波和正弦波信号发生器电路元器件及参数选择 17
3.3电路的仿真调试 17
3.4本章小结 19
第4章 信号发生器的制作 20
4.1一种新型的信号发生器 20
4.1.1芯片管脚功能 20
4.1.2芯片内部电路的特点 21
4.1.3芯片内部结构图 21
4.2主要参数的确定 22
4.3制作过程 24

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4.3.1电子电路的组装 24
4.3.2电子电路的调试 25
4.3.3单元电路调试 25
4.3.4整机联调 25
4.4本章小结 26
结论 28
致谢 29
参考文献 30
附录A 31
附录B 36
第1章 绪论 
1.1课题背景 
信号发生器又称信号源或振荡器，在生产实践和科技领域中有着广泛的应用。各种波形曲线均可以用三角函数方程式来表示。能够产生多种波形,如三角波、锯齿波、矩形波（含方波）、正弦波的电路被称为函数信号发生器。函数信号发生器在电路实验和设备检测中具有十分广泛的用途。例如在通信、广播、电视系统中，都需要射频（高频）发射，这里的射频波就是载波，把音频（低频）、视频信号或脉冲信号运载出去，就需要能够产生高

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