毕 业 设 计 说 明 书
毕业设计题目 信号波形合成实验电路
系 电子信息工程系 专业班级 姓 名
学 号 指导教师
2011年5月29日
信号波形合成实验电路
摘 要
近年来，以信息技术为代表的新技术促进了电子行业的飞速增长，随着科学技术的不断进步，人们利用各种方法增加对世界的感知，这些外界信息往往都是连续变化的模拟量，如热电偶、压力应变片等，所以要对模拟量系统进行数字控制，就必须对模拟量采集、处理和显示，因此信号波形合成的应用比较广泛。
系统主要分四大部分，即方波振荡电路，分频与滤波，移相处理，加法器。 系统模拟部分分别使用了TI公司的电源芯片MC34063，滤波芯片TLC04，运放芯片OPA820、OPA842、OP07，计数器74LS194，并在设计中利用TI公司的MSP430F149完成了对各正弦波的测量以及数显功能。
本文通过模拟电路来完成方波信号的产生、分频、滤波、放大、衰减、移相以及合成等功能。在信号处理中，根据设计要求和方波、三角波傅里叶变换后的特性来决定各产生波形的幅度和相位。利用MSP430F149完成了对各正弦波的测量以及数显功能。本系统电路结构简单、各波形良好，测量结果精确。 关键词：振荡电路，分频滤波，傅里叶变换
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信号波形合成实验电路
Abstract
In recent years, Information Technology which is the representative of new technologies promote the electronics industry's development, With the continuous progress of science and technology, People use various methods to increase the perception of the world, These external information are often analog which is continuous change, such as thermocouples, strain gauges and so on, So if we want control the analog with the digital. We should acquisition, processing and display the analog. Therefore the waveform synthesis are widely used.
The System is divided into four parts, namely square-wave oscillator circuit, frequency division and filtering, phase processing and the adder.
Simulation part uses the chips of TI company powerchip MC34063, filter chip TLC04, op-amp chip OPA820, OPA842, OP07, counter 74LS194, and in the design using TI's MSP430F149 to completed a measurement of the sine wave and digital display features .
In this paper, we take use of analog circuit to complete the square wave signal generation, frequency, filtering, amplification, attenuation, phase shift and synthetic functions. In signal processing, according to the design requirements and the square wave, triangle wave Fourier transform to determine the characteristics of the waveform of the generated amplitude and phase. We use the MSP430F149 to complete the measurement of the sine wave and digital display features. The system is simple circuit structure, the waves are perfect and the measurements are precision.
Key words: oscillation circuit, frequency filtering, Fourier transform
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信号波形合成实验电路
目 录
第1章 绪论 .................................................................................................................... - 1 - 第2章 系统方案介绍 .................................................................................................... - 2 -
2.1方案论证 ........................................................................................................... - 2 -
2.1.1方波振荡电路的选择 ........................................................................... - 2 - 2.1.2低通滤波电路的选择 ........................................................................... - 2 - 2.2整体系统方案 ................................................................................................... - 2 - 第3章 模块介绍 ............................................................................................................ - 4 -
3.1电源模块 ........................................................................................................... - 4 -
3.1.1主要元件介绍 ....................................................................................... - 4 - 3.1.2电源模块电路 ....................................................................................... - 6 - 3.2方波振荡模块 ................................................................................................... - 7 -
3.2.1主要元件介绍 ....................................................................................... - 7 - 3.2.2方波振荡模块电路 ............................................................................... - 8 - 3.3分频模块 ........................................................................................................... - 9 -
3.3.1主要元件介绍 ....................................................................................... - 9 - 3.3.2分频模块电路 ..................................................................................... - 11 - 3.4滤波模块 ......................................................................................................... - 12 -
3.4.1主要元件介绍 ..................................................................................... - 12 - 3.4.2滤波模块电路 ..................................................................................... - 13 - 3.5基本运算模块 ................................................................................................. - 14 -
3.5.1主要元件介绍 ..................................................................................... - 15 - 3.5.2放大增益模块电路 ............................................................................. - 16 - 3.5.3衰减移相模块电路 ............................................................................. - 17 - 3.5.4加法器模块电路 ................................................................................. - 17 - 3.6测试与数字显示模块 ..................................................................................... - 18 -
3.6.1主要元件介绍 ..................................................................................... - 18 - 3.6.2测试与数字显示模块电路 ................................................................. - 20 -
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信号波形合成实验电路
第4章 性能测试与分析 .............................................................................................. - 21 -
4.1方波振荡器测试 ............................................................................................. - 21 - 4.2分频滤波电路测试 ......................................................................................... - 21 - 4.3放大、衰减、移相电路测试 ......................................................................... - 21 - 4.4加法器测试 ..................................................................................................... - 22 - 4.5三角波谐波组成测试 ..................................................................................... - 23 - 4.6测量数字显示电路 ......................................................................................... - 23 - 结 论 .............................................................................................................................. - 25 - 参 考 文 献 .................................................................................................................. - 26 - 附录 ................................................................................................................................ - 27 - 致 谢 .............................................................................................................................. - 33 -
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