摘要电荷弱信号检测是一门新兴的技术学科，它利用电子学、信息论和物理学的方法，分析噪声产生的原因和规律，研究被测信号的特征，检测出并恢复被背景噪声掩盖的微弱信号。微弱信号检测的宗旨是研究如何从强噪声中提取有用信号，任务是研究微弱信号检测的理论、探索新方法和新技术，从而将其应用于各个学科领域当中。在这次毕业设计的过程中，我查阅了电荷变换器设计及OrCAD技术相关的文献资料，完成了电荷弱信号检测电路的设计并进行PSpice参数、噪声仿真分析，给出分析结果。通过目前对微弱信号检测的理论的学习及主要器件进行了详细的认识,对微弱信号的检测技术有了一定的了解，为以后的工作学习奠定了基础。65168

毕业论文关键词  微弱信号  信号检测  检测原理  仿真分析 

毕业设计说明书（论文）外文摘要

Title    Design of detecting weak signal of  electric charge and the simulation and analysis of parameters and noise of Pspice                

Abstract

Detection of electric charges` weak signal is a Emerging discipline,it uses the way of Electronics Informatics and Physics to analyze the reasons and laws of  the generation of noise.,to study the feature of measured signal,thus detecting and recovering the weak signal that be covered by background noise.Purposes of weak signal detecting is to study how can we collect the useful information from strong noise.It`s task is to study the theory of weak signal detecting,to explore new ways and technologies,in case that can we ultilize it in every situations.During this times research,I have searched many realated references about Charge converter and  technology of OrCAD.,designed the circurt of detecting weak signal of  electric charge.finisched the Simulation Analysis by PSpice..From learing the weak signal detecting theory and recogzing the most of devices,I have a certain understanding of weak signal setecting,it will obviously helps me a lot during my feature study and work.

Keywords   weak signal     signal detection   detection principle Simulation Analysis

目  次

1 引言 1

1.1 电荷弱信号检测的发展背景 1

1.2电荷弱信号检测概述 1

1.3 本文所做的主要工作： 2

2 基于运算放大器和模拟集成电路的电路设计 2

2.1 EDA概述及其在电子工程设计中的应用 3

3 Orcad电路设计 4

3.1 电子线路CAD技术 4

3.2 Orcad软件系统 5

3.3 电路原理图的基本组成要素和设计的基本过程 7

3.4 完整电路原理图及说明 8

4 PSpice参数、噪声仿真分析 12

4.1 Pspice电路仿真程序 12

4.2时域（time domain）仿真 16

4.3 偏置点（Bias Point）仿真 19

4.4 交流扫描（AC Sweep）仿真 21

结  论 25

致  谢 27

参考文献 28