📄 模电基础知识2008.mht
字号:
;效幅值及波形失真等&#=
38382;题。</span><span
lang=3DEN-US style=3D'font-size:15.0pt'><o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:15.0pt;font-family:SimSun;mso=
-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>　　=
</span><span
lang=3DEN-US style=3D'font-size:15.0pt'>26</span><span style=3D'font-size:1=
5.0pt;
font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-hansi-font-f=
amily:
"Times New Roman"'>、如何评价放大=
电路的性能</span><span
lang=3DEN-US style=3D'font-size:15.0pt'>?</span><span style=3D'font-size:15=
.0pt;
font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-hansi-font-f=
amily:
"Times New Roman"'>有哪些主要指标=
</span><span
lang=3DEN-US style=3D'font-size:15.0pt'>?<o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:15.0pt;font-family:SimSun;mso=
-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>　　=
答：放大电路的性能=
2909;坏一般由如下几项১=
1;标确定：</span><span
lang=3DEN-US style=3D'font-size:15.0pt'><o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:15.0pt;font-family:SimSun;mso=
-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>　　=
增益、输入输出电阻=
2289;通频带、失真度、߼=
9;噪比。</span><span
lang=3DEN-US style=3D'font-size:15.0pt'><o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:15.0pt;font-family:SimSun;mso=
-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>　　=
</span><span
lang=3DEN-US style=3D'font-size:15.0pt'>27</span><span style=3D'font-size:1=
5.0pt;
font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-hansi-font-f=
amily:
"Times New Roman"'>、为什么放大器=
的电压增益的单位常=
4120;使用分贝？它和倍ਤ=
8;之间有什么关系？</span><s=
pan
lang=3DEN-US style=3D'font-size:15.0pt'><o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:15.0pt;font-family:SimSun;mso=
-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>　　=
答：放大器的电压增=
0410;的单位常常使用分ผ=
5;的原因：（</span><span
lang=3DEN-US style=3D'font-size:15.0pt'>1</span><span style=3D'font-size:15=
.0pt;
font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-hansi-font-f=
amily:
"Times New Roman"'>）数值变小，读=
写方便。（</span><span
lang=3DEN-US style=3D'font-size:15.0pt'>2</span><span style=3D'font-size:15=
.0pt;
font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-hansi-font-f=
amily:
"Times New Roman"'>）运算方便。（=
</span><span
lang=3DEN-US style=3D'font-size:15.0pt'>3</span><span style=3D'font-size:15=
.0pt;
font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-hansi-font-f=
amily:
"Times New Roman"'>）符合听感，估=
算方便。二者之间的=
0851;系是：</span><span
lang=3DEN-US style=3D'font-size:15.0pt'><o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:15.0pt;font-family:SimSun;mso=
-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>　　=
</span><span
lang=3DEN-US style=3D'font-size:15.0pt'><a
href=3D"http://www.zdh1909.com/Upfiles/BeyondPic/2008-04/20084289681939532.=
gif"><span
style=3D'color:windowtext;mso-fareast-language:ZH;text-decoration:none;
text-underline:none'><!--[if gte vml 1]><v:shape id=3D"_x0000_i1031" type=
=3D"#_x0000_t75"
alt=3D"模电基础知识 - yangjian675 - ya=
ngjian675的博客"
href=3D"http://www.zdh1909.com/Upfiles/BeyondPic/2008-04/20084289681939532=
.gif"
style=3D'width:90.75pt;height:35.25pt' o:button=3D"t">
<v:imagedata src=3D"file7544.files/image005.gif" o:href=3D"http://www.zdh1=
909.com/Upfiles/BeyondPic/2008-04/20084289681939532.gif"/>
</v:shape><![endif]--><![if !vml]><span style=3D'mso-ignore:vglayout'><img
border=3D0 width=3D121 height=3D47 src=3D"file7544.files/image005.gif"
alt=3D"模电基础知识 - yangjian675 - yan=
gjian675的博客"
title=3D"模电基础知识 - yangjian675 - y=
angjian675的博客"
v:shapes=3D"_x0000_i1031"></span><![endif]></span></a><o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US style=3D'font-size:15.0pt'> <o=
:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:15.0pt;font-family:SimSun;mso=
-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>　　=
</span><span
lang=3DEN-US style=3D'font-size:15.0pt'>28</span><span style=3D'font-size:1=
5.0pt;
font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-hansi-font-f=
amily:
"Times New Roman"'>、放大器的通频=
带是否越宽越好？为=
0160;么？</span><span
lang=3DEN-US style=3D'font-size:15.0pt'><o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:15.0pt;font-family:SimSun;mso=
-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>　　=
答：不！放大器通频=
4102;的宽度并不是越宽ว=
4;好，关键是应该看放&=
#22823;器对所处理的信号'=
057;率有无特别的要求！=
;例如选频放大器要求&#=
36890;频带就应该很窄，Ň=
80;一般的音频放大器的=
通频带则比较宽。</span><span
lang=3DEN-US style=3D'font-size:15.0pt'><o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:15.0pt;font-family:SimSun;mso=
-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>　　=
</span><span
lang=3DEN-US style=3D'font-size:15.0pt'>29</span><span style=3D'font-size:1=
5.0pt;
font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-hansi-font-f=
amily:
"Times New Roman"'>、放大器的输入=
输出电阻对放大器有=
0160;么影响？</span><span
lang=3DEN-US style=3D'font-size:15.0pt'><o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:15.0pt;font-family:SimSun;mso=
-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>　　=
答：放大器的输入电=
8459;应该越高越好，这੫=
9;可以提高输入信号源&=
#30340;有效输出，将信号=
304;的内阻上所消耗的有=
;效信号降低到最小的&#=
33539;围。而输出电阻则ò=
12;该越低越好，这样可=
以提高负载上的有效=
6755;出信号比例。</span><span
lang=3DEN-US style=3D'font-size:15.0pt'><o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:15.0pt;font-family:SimSun;mso=
-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>　　=
</span><span
lang=3DEN-US style=3D'font-size:15.0pt'>30</span><span style=3D'font-size:1=
5.0pt;
font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-hansi-font-f=
amily:
"Times New Roman"'>、设计放大器时=
，对输入输出电阻来=
5828;，其取值原则是什ߔ=
0;？</span><span
lang=3DEN-US style=3D'font-size:15.0pt'><o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:15.0pt;font-family:SimSun;mso=
-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>　　=
答：高入低出。</span><span
lang=3DEN-US style=3D'font-size:15.0pt'><o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:15.0pt;font-family:SimSun;mso=
-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>　　=
</span><span
lang=3DEN-US style=3D'font-size:15.0pt'>31</span><span style=3D'font-size:1=
5.0pt;
font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-hansi-font-f=
amily:
"Times New Roman"'>、放大器的失真=
一般分为几类？</span><span
lang=3DEN-US style=3D'font-size:15.0pt'><o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:15.0pt;font-family:SimSun;mso=
-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>　　=
答：单管交流小信号=
5918;大器一般有饱和失௩=
5;、截止失真和非线性&=
#22833;真三类、推挽功率=
918;大器还可能存在交越=
;失真。</span><span
lang=3DEN-US style=3D'font-size:15.0pt'><o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:15.0pt;font-family:SimSun;mso=
-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>　　=
</span><span
lang=3DEN-US style=3D'font-size:15.0pt'>32</span><span style=3D'font-size:1=
5.0pt;
font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-hansi-font-f=
amily:
"Times New Roman"'>、放大器的工作=
点过高会引起什么样=
0340;失真？工作点过低ࡰ=
2;？</span><span
lang=3DEN-US style=3D'font-size:15.0pt'><o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:15.0pt;font-family:SimSun;mso=
-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>　　=
答：饱和失真、截止=
2833;真</span><span
lang=3DEN-US style=3D'font-size:15.0pt'><o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:15.0pt;font-family:SimSun;mso=
-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>　　=
</span><span
lang=3DEN-US style=3D'font-size:15.0pt'>33</span><span style=3D'font-size:1=
5.0pt;
font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-hansi-font-f=
amily:
"Times New Roman"'>、放大器的非线=
性失真一般是哪些原=
2240;引起的？</span><span
lang=3DEN-US style=3D'font-size:15.0pt'><o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:15.0pt;font-family:SimSun;mso=
-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>　　=
答：工作点落在输入=
9305;性曲线的非线性区ӌ=
9;而输入信号的极小值&=
#36824;没有为零时会导致&=
750;线性失真。</span><span
lang=3DEN-US style=3D'font-size:15.0pt'><o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:15.0pt;font-family:SimSun;mso=
-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>　　=
</span><span
lang=3DEN-US style=3D'font-size:15.0pt'>34</span><span style=3D'font-size:1=
5.0pt;
font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-hansi-font-f=
amily:
"Times New Roman"'>、微变等效电路=
分析法与图解法在放=
2823;器的分析方面有什ߔ=
0;区别？</span><span
lang=3DEN-US style=3D'font-size:15.0pt'><o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:15.0pt;font-family:SimSun;mso=
-ascii-font-family:
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