所有文章
分类
学习 阅读 生活 网站
标签 关于

目录

模拟电子技术基础学习笔记（八）

 收录于 学习 计算机
     约 668 字   预计阅读 2 分钟  次阅读    条评论
摘要
模拟电子技术基础学习笔记（八）。
崔叉叉注
如果要100%理解并掌握这门课的内容，尤其是电路的分析与计算部分，需要基本电路理论这门课作为前置知识。否则不需要。

5 放大电路的频率响应

5.1 频率响应的概述

/images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.1%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94%E7%9A%84%E6%A6%82%E8%BF%B0/%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E6%8C%87%E6%A0%87.png /images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.1%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94%E7%9A%84%E6%A6%82%E8%BF%B0/%E9%A2%91%E5%93%8D.png /images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.1%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94%E7%9A%84%E6%A6%82%E8%BF%B0/H%E5%8F%82%E6%95%B0.png

5.1.1 高通电路

/images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.1%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94%E7%9A%84%E6%A6%82%E8%BF%B0/%E9%AB%98%E9%80%9A%E7%94%B5%E8%B7%AF%E5%8F%8A%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94.png

  1. 传输特性（输出与输入之间的特性）

    /images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.1%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94%E7%9A%84%E6%A6%82%E8%BF%B0/%E9%AB%98%E9%80%9A%E7%94%B5%E8%B7%AF%E4%BC%A0%E8%BE%93%E7%89%B9%E6%80%A7.png
    高通电路传输特性

  2. 下限截止频率

    /images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.1%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94%E7%9A%84%E6%A6%82%E8%BF%B0/%E4%B8%8B%E9%99%90%E6%88%AA%E6%AD%A2%E9%A2%91%E7%8E%87.png
    下限截止频率

  3. 幅频特性：|Au|

  4. 相频特性


5.1.2 低通电路

/images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.1%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94%E7%9A%84%E6%A6%82%E8%BF%B0/%E4%BD%8E%E9%80%9A%E7%94%B5%E8%B7%AF%E5%8F%8A%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94.png

  1. 传输特性

    /images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.1%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94%E7%9A%84%E6%A6%82%E8%BF%B0/%E4%BD%8E%E9%80%9A%E7%94%B5%E8%B7%AF%E4%BC%A0%E8%BE%93%E7%89%B9%E6%80%A7.png
    低通电路传输特性

  2. 低通电路相频特性

    /images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.1%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94%E7%9A%84%E6%A6%82%E8%BF%B0/%E4%BD%8E%E9%80%9A%E7%94%B5%E8%B7%AF%E7%9B%B8%E9%A2%91%E7%89%B9%E6%80%A7.png
    低通电路相频特性

5.1.3 波特图

/images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.1%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94%E7%9A%84%E6%A6%82%E8%BF%B0/%E9%AB%98%E9%80%9A%E7%94%B5%E8%B7%AF%E4%B8%8E%E4%BD%8E%E9%80%9A%E7%94%B5%E8%B7%AF%E7%9A%84%E6%B3%A2%E7%89%B9%E5%9B%BE.png
/images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.1%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94%E7%9A%84%E6%A6%82%E8%BF%B0/%E5%BE%97%E5%87%BA%E6%B3%A2%E7%89%B9%E5%9B%BE.png
得出波特图

5.2 晶体管的高频等效模型

5.2.1 混合π模型

  1. 混合π模型

    1. 混合π模型

      /images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.2%E6%99%B6%E4%BD%93%E7%AE%A1%E7%9A%84%E9%AB%98%E9%A2%91%E7%AD%89%E6%95%88%E6%A8%A1%E5%9E%8B/%E6%99%B6%E4%BD%93%E7%AE%A1%E7%BB%93%E6%9E%84%E7%A4%BA%E6%84%8F%E5%9B%BE%E4%B8%8E%E6%B7%B7%E5%90%88%CF%80%E6%A8%A1%E5%9E%8B.png /images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.2%E6%99%B6%E4%BD%93%E7%AE%A1%E7%9A%84%E9%AB%98%E9%A2%91%E7%AD%89%E6%95%88%E6%A8%A1%E5%9E%8B/%E6%B7%B7%E5%90%88%CF%80%E6%A8%A1%E5%9E%8B%E7%AE%80%E5%8C%96.png

    2. 模型参数

      1. β0
      2. Cob ≈ Cμ
      3. 特征频率（fT）

  2. 单向化π模型

    1. 单向化π模型

      /images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.2%E6%99%B6%E4%BD%93%E7%AE%A1%E7%9A%84%E9%AB%98%E9%A2%91%E7%AD%89%E6%95%88%E6%A8%A1%E5%9E%8B/%E5%8D%95%E5%90%91%E5%8C%96%CF%80%E6%A8%A1%E5%9E%8B.png
      单向化π模型

    2. 模型参数

      /images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.2%E6%99%B6%E4%BD%93%E7%AE%A1%E7%9A%84%E9%AB%98%E9%A2%91%E7%AD%89%E6%95%88%E6%A8%A1%E5%9E%8B/%E5%8D%95%E5%90%91%E5%8C%96%CF%80%E6%A8%A1%E5%9E%8B%E5%8F%82%E6%95%B01.png
      单向化π模型参数1
      /images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.2%E6%99%B6%E4%BD%93%E7%AE%A1%E7%9A%84%E9%AB%98%E9%A2%91%E7%AD%89%E6%95%88%E6%A8%A1%E5%9E%8B/%E5%8D%95%E5%90%91%E5%8C%96%CF%80%E6%A8%A1%E5%9E%8B%E5%8F%82%E6%95%B02.png
      单向化π模型参数2

5.2.2 β的频率响应

  1. 分析条件

    /images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.2%E6%99%B6%E4%BD%93%E7%AE%A1%E7%9A%84%E9%AB%98%E9%A2%91%E7%AD%89%E6%95%88%E6%A8%A1%E5%9E%8B/%E5%88%86%E6%9E%90%E6%9D%A1%E4%BB%B6.png
    分析条件

  2. β的分析

    /images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.2%E6%99%B6%E4%BD%93%E7%AE%A1%E7%9A%84%E9%AB%98%E9%A2%91%E7%AD%89%E6%95%88%E6%A8%A1%E5%9E%8B/%CE%B2%E7%9A%84%E5%88%86%E6%9E%90.png
    β的分析
    /images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.2%E6%99%B6%E4%BD%93%E7%AE%A1%E7%9A%84%E9%AB%98%E9%A2%91%E7%AD%89%E6%95%88%E6%A8%A1%E5%9E%8B/%CE%B2%E7%9A%84%E5%80%BC.png
    β的值

  3. 共射截止频率

    /images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.2%E6%99%B6%E4%BD%93%E7%AE%A1%E7%9A%84%E9%AB%98%E9%A2%91%E7%AD%89%E6%95%88%E6%A8%A1%E5%9E%8B/%E5%85%B1%E5%B0%84%E6%88%AA%E6%AD%A2%E9%A2%91%E7%8E%87.png
    共射截止频率

  4. β波特图

    /images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.2%E6%99%B6%E4%BD%93%E7%AE%A1%E7%9A%84%E9%AB%98%E9%A2%91%E7%AD%89%E6%95%88%E6%A8%A1%E5%9E%8B/%CE%B2%E6%B3%A2%E7%89%B9%E5%9B%BE.png
    β波特图

5.3 场效应管的高频等效模型

/images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.3%E5%9C%BA%E6%95%88%E5%BA%94%E7%AE%A1%E7%9A%84%E9%AB%98%E9%A2%91%E7%AD%89%E6%95%88%E6%A8%A1%E5%9E%8B/%E5%9C%BA%E6%95%88%E5%BA%94%E7%AE%A1%E7%9A%84%E9%AB%98%E9%A2%91%E7%AD%89%E6%95%88%E6%A8%A1%E5%9E%8B.png
场效应管的高频等效模型

5.4 单管放大电路的频响

5.4.1 单管共射放大电路

/images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.4%E5%8D%95%E7%AE%A1%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E5%93%8D/%E5%8D%95%E7%AE%A1%E5%85%B1%E5%B0%84%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E5%8F%8A%E5%85%B6%E7%AD%89%E6%95%88%E7%94%B5%E8%B7%AF.png
单管共射放大电路及其等效电路

5.4.2 单管放大电路频响分析

/images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.4%E5%8D%95%E7%AE%A1%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E5%93%8D/%E5%8D%95%E7%AE%A1%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E9%A2%91%E5%93%8D%E5%88%86%E6%9E%901.png
单管放大电路频响分析1
/images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.4%E5%8D%95%E7%AE%A1%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E5%93%8D/%E5%8D%95%E7%AE%A1%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E9%A2%91%E5%93%8D%E5%88%86%E6%9E%902.png
单管放大电路频响分析2

5.4.3 频率响应的改善

/images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.4%E5%8D%95%E7%AE%A1%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E5%93%8D/%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94%E7%9A%84%E6%94%B9%E5%96%84.png
频率响应的改善

5.5 多级放大电路的频响

/images/Fundamentals_of_Analog_Electronic_Technology/5%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E7%8E%87%E5%93%8D%E5%BA%94/5.5%E5%A4%9A%E7%BA%A7%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E9%A2%91%E5%93%8D/%E4%B8%A4%E7%BA%A7%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E6%B3%A2%E7%89%B9%E5%9B%BE.png
两级放大电路的波特图

6 放大电路中的反馈

6.6 负反馈放大电路的稳定性

6.6.1 自激振荡的原因

/images/Fundamentals_of_Analog_Electronic_Technology/6%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E5%8F%8D%E9%A6%88/6.6%E8%B4%9F%E5%8F%8D%E9%A6%88%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E7%A8%B3%E5%AE%9A%E6%80%A7/%E8%87%AA%E6%BF%80%E6%8C%AF%E8%8D%A1%E7%9A%84%E5%8E%9F%E5%9B%A0.png
自激振荡的原因
/images/Fundamentals_of_Analog_Electronic_Technology/6%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E5%8F%8D%E9%A6%88/6.6%E8%B4%9F%E5%8F%8D%E9%A6%88%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E7%A8%B3%E5%AE%9A%E6%80%A7/%E7%A8%B3%E5%AE%9A%E6%80%A7%E5%AE%9A%E6%80%A7%E5%88%86%E6%9E%90.png
稳定性定性分析

6.6.2 稳定性分析

  1. 直接耦合，反馈为纯电阻网络

    /images/Fundamentals_of_Analog_Electronic_Technology/6%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E5%8F%8D%E9%A6%88/6.6%E8%B4%9F%E5%8F%8D%E9%A6%88%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E7%A8%B3%E5%AE%9A%E6%80%A7/%E7%9B%B4%E6%8E%A5%E8%80%A6%E5%90%88%E6%83%85%E5%86%B5.png
    直接耦合情况

  2. 可能性因素

    /images/Fundamentals_of_Analog_Electronic_Technology/6%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E5%8F%8D%E9%A6%88/6.6%E8%B4%9F%E5%8F%8D%E9%A6%88%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E7%A8%B3%E5%AE%9A%E6%80%A7/%E5%8F%AF%E8%83%BD%E6%80%A7%E6%9D%A1%E4%BB%B6.png
    可能性条件

6.6.3 稳定性的判断

  1. 判断方法
    1. f0：φA + φF = 180°
    2. fc：20log|AF| = 0
    3. 不存在f0 —— 稳定
    4. 存在f0
      1. f0 > fc —— 稳定
      2. f0 < fc —— 振荡
  2. 稳定裕度
    1. Gm = 20log|AF| 当 f = f0，Gm < 0，|GM| 裕度为 10dB
    2. φm > 45°

6.6.4 消除方法

/images/Fundamentals_of_Analog_Electronic_Technology/6%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E5%8F%8D%E9%A6%88/6.6%E8%B4%9F%E5%8F%8D%E9%A6%88%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E7%A8%B3%E5%AE%9A%E6%80%A7/%E6%B6%88%E9%99%A4%E6%96%B9%E6%B3%951.png
消除方法1
/images/Fundamentals_of_Analog_Electronic_Technology/6%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E5%8F%8D%E9%A6%88/6.6%E8%B4%9F%E5%8F%8D%E9%A6%88%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E7%A8%B3%E5%AE%9A%E6%80%A7/%E6%B6%88%E9%99%A4%E6%96%B9%E6%B3%952.png
消除方法2
/images/Fundamentals_of_Analog_Electronic_Technology/6%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E5%8F%8D%E9%A6%88/6.6%E8%B4%9F%E5%8F%8D%E9%A6%88%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E7%A8%B3%E5%AE%9A%E6%80%A7/%E6%B6%88%E9%99%A4%E6%96%B9%E6%B3%953.png
消除方法3
/images/Fundamentals_of_Analog_Electronic_Technology/6%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E5%8F%8D%E9%A6%88/6.6%E8%B4%9F%E5%8F%8D%E9%A6%88%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E7%A8%B3%E5%AE%9A%E6%80%A7/%E6%B6%88%E9%99%A4%E6%96%B9%E6%B3%954.png
消除方法4
/images/Fundamentals_of_Analog_Electronic_Technology/6%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E5%8F%8D%E9%A6%88/6.6%E8%B4%9F%E5%8F%8D%E9%A6%88%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E7%A8%B3%E5%AE%9A%E6%80%A7/%E6%B6%88%E9%99%A4%E6%96%B9%E6%B3%955.png
消除方法5
/images/Fundamentals_of_Analog_Electronic_Technology/6%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E5%8F%8D%E9%A6%88/6.6%E8%B4%9F%E5%8F%8D%E9%A6%88%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E7%A8%B3%E5%AE%9A%E6%80%A7/%E6%B6%88%E9%99%A4%E6%96%B9%E6%B3%956.png
消除方法6
/images/Fundamentals_of_Analog_Electronic_Technology/6%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E5%8F%8D%E9%A6%88/6.6%E8%B4%9F%E5%8F%8D%E9%A6%88%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E7%A8%B3%E5%AE%9A%E6%80%A7/%E6%B6%88%E9%99%A4%E6%96%B9%E6%B3%957.png
消除方法7
/images/Fundamentals_of_Analog_Electronic_Technology/6%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E5%8F%8D%E9%A6%88/6.6%E8%B4%9F%E5%8F%8D%E9%A6%88%E6%94%BE%E5%A4%A7%E7%94%B5%E8%B7%AF%E7%9A%84%E7%A8%B3%E5%AE%9A%E6%80%A7/%E6%B6%88%E9%99%A4%E6%96%B9%E6%B3%958.png
消除方法8
更新于 2022/01/14
阅读原始文档
 模拟电子技术
返回 | 主页