📄 模电基础知识2008.mht
字号:
<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"'>  =
都是由少数载流子的=
6816;动产生的,所以对଄=
1;度非常敏感,当温度&=
#21319;高时二者都将急剧=
686;大。从而对放大器产=
;生不利影响。因此在&#=
23454;际工作中要求它们Ū=
34;小越好。</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'>15</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"'>、三极管的门电=
压一般是多少?</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:硅管一般为</span><span
lang=3DEN-US style=3D'font-size:15.0pt'>0.5</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"'>伏</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 N=
ew Roman";
mso-hansi-font-family:"Times New Roman"'>锗管约为</=
span><span
lang=3DEN-US style=3D'font-size:15.0pt'>0.2</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"'>伏</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'>16</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"'>、放大电路放大=
电信号与放大镜放大=
9289;体的意义相同吗</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:不相同。</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'>17</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"'>、在三极管组成=
的放大器中,基本偏=
2622;条件是什么?</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:发射结正偏;集=
0005;结反偏。</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'>18</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"'>、三极管输入输=
出特性曲线一般分为=
0960;个什么区域?</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:一般分为放大区=
2289;饱和区和截止区。</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'>19</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"'>、放大电路的基=
本组态有几种?它们=
0998;别是什么</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:三种,分别是共=
1457;射极、共基极和共༓=
8;电极。</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'>20</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"'>、在共发射极放=
大电路中,一般有那=
0960;种偏置电路?</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:有上基偏、分压=
4335;和集</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"'>基反馈式。</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'>21</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"'>、静态工作点的=
确定对放大器有什么=
4847;义?</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:正确地确定静态=
4037;作点能够使放大器੍=
7;最小的截止失真和饱&=
#21644;失真,同时还可以!=
719;得最大的动态范围,=
;提高三极管的使用效&#=
29575;。</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'>22</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"'>、放大器的静态=
工作点一般应该处于=
9977;极管输入输出特性ੋ=
4;线的什么区域?</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:通常应该处于三=
6497;管输入输出特性曲ಬ=
7;的放大区中央。</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'>23</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"'>、在绘制放大器=
的直流通路时对电源=
1644;电容器应该任何对঍=
3;?</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:电容器应该视为=
4320;路,电源视为理想ஸ=
5;源。</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'>24</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"'>、放大器的图解=
法适合哪些放大器?</s=
pan><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:一般适合共射式=
9978;基偏单管放大器和৷=
2;挽式功率放大器。</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"'>  =
</span><span
lang=3DEN-US style=3D'font-size:15.0pt'>25</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"'>、放大器的图解=
法中的直流负载线和=
0132;流负载线各有什么঴=
7;义?</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:直流负载线确定=
8745;态时的直流通路参ਤ=
8;。交流负载线的意义&=
#22312;于有交流信号时分=
512;放大器输出的最大有=
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