低频小信号放大器电路设计毕业论文

低频小信号放大器电路设计毕业论文

摘要

低频小信号放大器电路设计

摘要

实用性低频小信号放大器电路设计，它主要用于使用前置放大器的低频小信号的电压经过集成块LM358的放大使其增益二十几倍，达到信号放大的作用，本文介绍了其基本原理，内容，与低频放大微弱信号放大能力的技术路线，设计电路图方案等。

本系统是基于(IC)LM358设计而成的一种低频小信号放大器，整个电路主要由稳压电源，前置放大电路，波形变换电路3部分。电源主要是为前置放大器提供稳定的直流电源。前置放大器主要是由ML358一级放大电路和ML358二级放大电路组成，第一级可以将电压放大5倍，第二级可以放大1-5倍，总增益20-25倍，接通电源后，信号发生器产生信号，示波器用于变换的波形显示。通过波形的数据变化，计算出增益效果，是否满足设计需求。

该设计的电路结构简单，实用，充分利用了集成功放的优良性能。实验结果表明，前置放大器的带宽，失真，效率等方面具有较好的指标，具有较高的实用性，为小信号放大器的设计是一个广泛的思考。

关键词：低频小信号，电压放大，前置放大级电路，集成块LM358

Abstract

Design of low frequencysmall signal amplifier

Abstract：

The utility of low frequency small signal amplifier circuit design, it is mainly used for voltage low frequency small signal using a pre amplifier after amplification integrated block LM358 has gain 20 times, achieve signal amplification effect, this paper introduces the basic principle, content, and low frequency amplification technology route of weak signal amplification

ability, circuit design scheme.

The system is based on (IC) a low frequency small signal amplifier LM358 designed, the whole circuit is mainly composed of a regulated power supply, preamplifier circuit, a waveform transform circuit 3 parts. The power supply is mainly to provide a stable DC power for the preamplifier. The preamplifier is mainly composed of ML358 amplifier and ML358 two stage amplifier circuit, the first stage of the voltage can be magnified 5 times, second can be magnified 1-5 times, 20-25 times of the total gain, power, signal generator generates a signal, oscilloscope is used to transform the waveform display. By the waveform data changes, calculated the gain effect, whether meet the design requirements.

The design of the circuit structure is simple, practical, make full use of the excellent performance of the integrated amplifier. The experimental results show that, the pre amplifier bandwidth, distortion, has better efficiency indicators, and has higher practicability, designed for small signal amplifier is a broad thinking.

Keywords:Lowfrequency smalsignal,voltage amplification,preamplifiercircuit，Integrated block LM358 常州工学院延陵学院毕业设计说明书

目录

第1章绪论 (1)

前言 (3)

1.1课题研究背景 (3)

1.2课题主要研究内容 (4)

第2章设计方案分析 (5)

2.1设计任务 (6)

2.2设计分析 (7)

2.2.1设计技术指标 (7)

2.2.2集成块LM358的介绍 (8)

2.3 LM358概述 (9)

2.3.1 LM358的原理与应用 (9)

2.3.2 LM358行情介绍 (10)

第3章前置放大器的设置原理描述 (10)

3.1总体方框图设计 (11)

3.2方案设计与论证 (12)

3.3前置放大电路设计 (13)

3.4电压跟随器电路设计 (16)

第4章软件介绍 (17)

4.1 proteus仿真软件概述 (19)

第5章系统的软硬件调试 (22)

5.1实验电路功能的测试 (23)

5.2硬件调试 (23)

5.2.1上电前的调试 (23)

5.2.2 上电调试 (24)

5.3各模块调试 (24)

5.4整机调试 (25)

第6章详细元器件清单 (25)

6.1电路图汇总 (26)

6.2实验仪器清单 (26)

6.3实验元器件清单如下表 (27)

结论 (27)

致谢 (28)

参考文献 (31)

附录 (32)

第1章绪论

前言

在科学研究和工程实践中，经常遇到的微伏级信号的检测有问题，