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'差分放大电路实验 
《模拟电子技术实验》教学课件 
国家级电工电子实验教学示范中心 
 纲要 
一、实验目的 
二、实验电路与原理 
三、实验仪器与设备 
五、分析与思考 
四、实验内容与步骤 
一、实验目的 
1. 加深对差分放大器的理解。 
2. 学习差分放大器的调整及主要性能指标的测试
方法。 
3. 掌握提高共模抑制比KCMR的方法。 
二、实验电路与原理 
图1 差分放大器实验电路 
1、实验电路 
    当直流放大电路输
入端不加信号时，由于
温度、电源电压的变化
或其他干扰而引起的各
级工作点电位的缓慢变
化，都会经过各级放大
使末级输出电压偏离零
值而上下摆动，这种现
象称为零点漂移 
①直接耦合 
②用以放大极微小的直
流信号或缓慢变化的交
流信号 
③ 用恒流源代替RE，
可进一步提高放大器抑
制共模信号的能力。 
④可有效抑制零点漂移 
二、实验电路与原理 
2、差模特性 
差模信号输入Uid ：两管输入端所加信号大小相等、极性相反。 
差模电压增益Aud的测量： 
•输入差模信号为Uid，设差分放大器为单端输入-双端输出接法。用双踪
示波器分别观察两输出端的信号，它们应是一对大小相等、极性相反
的不失真正弦波。用毫伏表测量Uod1、Uod2的值，则差模电压增益为： 
 
 
•如果是单端输出，则 
 
 
•如果Uod1、Uod2不相等，说明放大器的参数不完全对称。若Uo1、
Uo2相差较大，应重新调整静态工作点，使电路尽可能对称。 
1
2
od
od
ud
id
U
U
A
U


1
2
od
od
ud
id
id
U
U
A
U
U


二、实验电路与原理 
3、共模特性 
共模信号输入△Vic ：两管输入端所加信号大小相等、极性相
同（如漂移电压、电源波动产生的干扰等）。 
双端输出时，由于同时从两管的集电极输出，如果电路完全
对称，则输出电压上△ Uoc1≈ △ Uoc2  ，共模电压增益为 
 
 
 
Auc=0，说明差分放大器双端输出时，对零点漂移等共模干扰
信号有很强的抑制能力。 
1
2
0
oc
oc
uc
ic
U
U
A
U

 



二、实验电路与原理 
4、共模抑制比KCMR 
反映差分放大器对共模信号的抑制能力。 
定义为放大器差模信号电压增益Aud和共模信号电压增益Auc之
比的绝对值，即： 
 
 
KCMR越大，说明差分放大器对共模信号的抑制力愈强，放大
器的性能愈好。 
|
|
ud
CMR
uc
A
K
A

三、实验仪器与设备 
1、KHM-2型模拟电路实验装置一套 
2、DCS-7020数字示波器一台 
3、SG2171A交流毫伏表一块 
4、VC9801A+数字万用表一块 
5、导线若干 
四、实验内容与步骤 
1、典型差分放大器性能测试 
按图连接实验电路，开关K拨向左边构成典型差动放大器。 
（1）测量静态工作点 
将放大器输入端A、B与地短接，接通±12V直流电源，用直流电压表测量输
出电压VO，调节调零电位器RP，使VO＝0。 调节要仔细，力求准确，注意换挡。
零点调好以后，用直流电压表测量T1、T2管各电极电位，记入表1。（表内为各
级的对地直流电压） 
表1 
UB1 
UB2 
UC1 
UC2 
UE1 
UE2 
典型差分放
大电路 
恒流源差分
放大电路 
四、实验内容与步骤 
（2） 测量差模电压放大倍数 
输入f=50Hz，Ui=0.1V的正弦信号（输入端连成差模输入方式），用毫伏表
测量单端输出差模电压Uod1和Uod2，记入表2中，并计算差模放大倍数Aud1、Aud2和
Aud。 
（3）测量共模电压放大倍数 
输入f=50Hz，Ui=0.1V的正弦信号（输入端连成共模输入方式），用毫伏表
测量单端输出共模电压Uoc1和Uoc2，记入表2中，并计算差模放大倍数Auc1、Auc2和
Auc（注意：换小量程测电压）。 
表2 
输
入
信
号 
差模值 
共模值 
共模
抑制
比
KCMR 
Uod1 
Uod2 
Uod 
Aud1 
Aud2 
Aud 
Uoc1 
Uoc2 
Uoc 
Auc1 
Auc2 
Auc 
典型
差分 
恒流
源式 
单端
输入 
/ 
/ 
/ 
/ 
/ 
/ 
四、实验内容与步骤 
2、具有恒流源的差分放大器 
电路接成具有恒流源的差分放大电路（开关K打向右边），测试内容
同典型差分放大电路的（1）、（2）、（3）项，并填入表1和表2中。 
3、单端输入差分放大器 
将电路输入端连成单端输入方式输入f=50Hz，Ui=0.1V的正弦信号，
测试内容同典型差分电路的（2）项，并填入表2中。 
五、分析与思考 
1、整理实验数据，完成实验报告。 
2、简要说明RE及恒流源的作用。 
END 
国家级电工电子实验教学示范中心 
《模拟电子技术实验》教学课件 
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        'show' => 'show.html',
      ),
      'cat_field' => NULL,
      'module_field' => NULL,
      'urlrule' => 4,
      'html' => 0,
      'chtml' => 0,
    ),
    'displayorder' => '0',
    'icon' => '',
    'index' => '2',
    'mid' => 'wenku',
    'pcatpost' => 0,
    'topid' => '5',
    'catids' => 
    array (
      0 => '8',
    ),
    'is_post' => 1,
    'tid' => 1,
    'url' => 'http://www.wenhuiw.com/wenku/dzdg',
    'total' => '请使用count标签查询',
    'field' => 
    array (
    ),
  ),
  12 => 
  array (
    'id' => '12',
    'pid' => '5',
    'pids' => '0,5',
    'name' => '电脑手机',
    'dirname' => 'dnsj',
    'pdirname' => 'hangye/',
    'child' => 0,
    'disabled' => '0',
    'ismain' => 1,
    'childids' => 12,
    'thumb' => '',
    'show' => '1',
    'setting' => 
    array (
      'disabled' => '0',
      'linkurl' => '',
      'getchild' => '0',
      'notedit' => '0',
      'seo' => 
      array (
      ),
      'template' => 
      array (
        'pagesize' => '20',
        'mpagesize' => '20',
        'list' => 'list.html',
        'category' => 'category.html',
        'search' => 'search.html',
        'show' => 'show.html',
      ),
      'cat_field' => NULL,
      'module_field' => NULL,
      'urlrule' => 4,
      'html' => 0,
      'chtml' => 0,
    ),
    'displayorder' => '0',
    'icon' => '',
    'index' => '2',
    'mid' => 'wenku',
    'pcatpost' => 0,
    'topid' => '5',
    'catids' => 
    array (
      0 => '12',
    ),
    'is_post' => 1,
    'tid' => 1,
    'url' => 'http://www.wenhuiw.com/wenku/dnsj',
    'total' => '请使用count标签查询',
    'field' => 
    array (
    ),
  ),
  13 => 
  array (
    'id' => '13',
    'pid' => '5',
    'pids' => '0,5',
    'name' => '交通道路',
    'dirname' => 'jtdl',
    'pdirname' => 'hangye/',
    'child' => 0,
    'disabled' => '0',
    'ismain' => 1,
    'childids' => 13,
    'thumb' => '',
    'show' => '1',
    'setting' => 
    array (
      'disabled' => '0',
      'linkurl' => '',
      'getchild' => '0',
      'notedit' => '0',
      'seo' => 
      array (
      ),
      'template' => 
      array (
        'pagesize' => '20',
        'mpagesize' => '20',
        'list' => 'list.html',
        'category' => 'category.html',
        'search' => 'search.html',
        'show' => 'show.html',
      ),
      'cat_field' => NULL,
      'module_field' => NULL,
      'urlrule' => 4,
      'html' => 0,
      'chtml' => 0,
    ),
    'displayorder' => '0',
    'icon' => '',
    'index' => '2',
    'mid' => 'wenku',
    'pcatpost' => 0,
    'topid' => '5',
    'catids' => 
    array (
      0 => '13',
    ),
    'is_post' => 1,
    'tid' => 1,
    'url' => 'http://www.wenhuiw.com/wenku/jtdl',
    'total' => '请使用count标签查询',
    'field' => 
    array (
    ),
  ),
  14 => 
  array (
    'id' => '14',
    'pid' => '5',
    'pids' => '0,5',
    'name' => '机械设备',
    'dirname' => 'jixie',
    'pdirname' => 'hangye/',
    'child' => 0,
    'disabled' => '0',
    'ismain' => 1,
    'childids' => 14,
    'thumb' => '',
    'show' => '1',
    'setting' => 
    array (
      'disabled' => '0',
      'linkurl' => '',
      'getchild' => '0',
      'notedit' => '0',
      'seo' => 
      array (
      ),
      'template' => 
      array (
        'pagesize' => '20',
        'mpagesize' => '20',
        'list' => 'list.html',
        'category' => 'category.html',
        'search' => 'search.html',
        'show' => 'show.html',
      ),
      'cat_field' => NULL,
      'module_field' => NULL,
      'urlrule' => 4,
      'html' => 0,
      'chtml' => 0,
    ),
    'displayorder' => '0',
    'icon' => '',
    'index' => '2',
    'mid' => 'wenku',
    'pcatpost' => 0,
    'topid' => '5',
    'catids' => 
    array (
      0 => '14',
    ),
    'is_post' => 1,
    'tid' => 1,
    'url' => 'http://www.wenhuiw.com/wenku/jixie',
    'total' => '请使用count标签查询',
    'field' => 
    array (
    ),
  ),
  15 => 
  array (
    'id' => '15',
    'pid' => '5',
    'pids' => '0,5',
    'name' => '能源动力',
    'dirname' => 'nydl',
    'pdirname' => 'hangye/',
    'child' => 0,
    'disabled' => '0',
    'ismain' => 1,
    'childids' => 15,
    'thumb' => '',
    'show' => '1',
    'setting' => 
    array (
      'disabled' => '0',
      'linkurl' => '',
      'getchild' => '0',
      'notedit' => '0',
      'seo' => 
      array (
      ),
      'template' => 
      array (
        'pagesize' => '20',
        'mpagesize' => '20',
        'list' => 'list.html',
        'category' => 'category.html',
        'search' => 'search.html',
        'show' => 'show.html',
      ),
      'cat_field' => NULL,
      'module_field' => NULL,
      'urlrule' => 4,
      'html' => 0,
      'chtml' => 0,
    ),
    'displayorder' => '0',
    'icon' => '',
    'index' => '2',
    'mid' => 'wenku',
    'pcatpost' => 0,
    'topid' => '5',
    'catids' => 
    array (
      0 => '15',
    ),
    'is_post' => 1,
    'tid' => 1,
    'url' => 'http://www.wenhuiw.com/wenku/nydl',
    'total' => '请使用count标签查询',
    'field' => 
    array (
    ),
  ),
  16 => 
  array (
    'id' => '16',
    'pid' => '5',
    'pids' => '0,5',
    'name' => '电气工控',
    'dirname' => 'dqgk',
    'pdirname' => 'hangye/',
    'child' => 0,
    'disabled' => '0',
    'ismain' => 1,
    'childids' => 16,
    'thumb' => '',
    'show' => '1',
    'setting' => 
    array (
      'disabled' => '0',
      'linkurl' => '',
      'getchild' => '0',
      'notedit' => '0',
      'seo' => 
      array (
      ),
      'template' => 
      array (
        'pagesize' => '20',
        'mpagesize' => '20',
        'list' => 'list.html',
        'category' => 'category.html',
        'search' => 'search.html',
        'show' => 'show.html',
      ),
      'cat_field' => NULL,
      'module_field' => NULL,
      'urlrule' => 4,
      'html' => 0,
      'chtml' => 0,
    ),
    'displayorder' => '0',
    'icon' => '',
    'index' => '2',
    'mid' => 'wenku',
    'pcatpost' => 0,
    'topid' => '5',
    'catids' => 
    array (
      0 => '16',
    ),
    'is_post' => 1,
    'tid' => 1,
    'url' => 'http://www.wenhuiw.com/wenku/dqgk',
    'total' => '请使用count标签查询',
    'field' => 
    array (
    ),
  ),
)

'/index.php?s=wenku&c=show&id=59&page=[page]'

''

'http://www.wenhuiw.com/wenku/a59.html'

array (
  's' => 'wenku',
  'c' => 'show',
  'id' => '59',
  'm' => 'index',
)