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1、课题多级放大器教学目标【知识目标】掌握多级放大器的基本原理【能力目标】1.多级放大电路2.多级放大电路的耦合方式【德育目标】培养学生刻苦专研的精神教学重点多级放大电路教学难点多级放大电路的阻容耦合方式教学时间2课时（第 14周）教具准备三极管，电阻，导线教学组织与实施教师活动学生活动【新课导入】在生产实践中，一些信号需经多级放大才能达到负载的要求。可由若干个单级放大电路组成的多级放大器来承担这一工作。在多级放大电路的前面几级，主要用作电压放大，大多采用阻容耦合方式;在最后的功率输出级中，常采用变压器藕合方式;在直流放大电路及线性集成电路中，常采用直接接藕合方式。【新课讲授】1.多级放大电路在实
2、际的电子设备中，为了得到足够大的增益或者考虑到输入电阻和输出电阻等特殊要求，放大器往往由多级组成。多级放大器由输入级、中间级和输出级组成。如图2.4.1所示，输出级一般是大信号放大器，我们只讨论由输入级到中间级组成的多级小信号放大器。理解什么是放大电路2.多级放大器的耦合方式1)阻容耦合阻容耦合就是利用电容作为耦合和隔直流元件的电路。阻容耦合的优点是：前后级直流通路彼此隔开，每一级的静态工作点都相互独立。便于分析、设计和应用。缺点是：信号在通过耦合电容加到下一级时会大幅度衰减。在集成电路里制造大电容很困难，所以阻容耦合只适用于分立元件电路。2)直接耦合直接耦合是将前后级直接相连的一种耦合方式。
3、但是，两个基本放大电路不能简单地连接在一起。如果连接，V1管集电极电位被 V2管基极限制在左右（设 V2为硅管），导致V1处于临界饱和状态；同时，V2基极电流由 Rb2和Rc1 流过的电流决定，因此 V2的工作点将发生变化，容易导致V2饱和。通过上述分析，在采用直接耦合方式时，必须解决级间电平配置和工作点漂移两个问题，以保证各级各自有合适的稳定的静态工作点。看懂多级放大器的耦合方式的电路图文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J
4、2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7
5、X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW
6、2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW
7、6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2
8、G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:
9、CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10
10、HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5直接耦合的优点是：电路中没有大电容和变压器，能放大缓慢变化的信号，它在集成电路中得到广泛的应用。它的缺点是：前、后级直流电路相通，静态工作点相互牵制、相互影响，不利于分析和设计3)变压器耦合变压器耦合是用变压器将前级的输出端与后级的输入端连接起来的方式。变压器耦合的优点是：各级直流通路相互独立，变压器通过磁路，把初级线圈的交流信号传到次级线圈，直流电压或电流无法通过变压器传给次级。理解两种耦合方式的优缺点文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR
11、2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码
12、:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10
13、 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2
14、ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档
15、编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J
16、10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V
17、2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5变压器在传递信号同时，能实现阻抗变换。变压器耦合的缺点是：体积大，不能实现集成化，此外，由于频率特性比较差，一般只应用于低频功率放大和中频调谐放大电路中。【课堂小结】今天我们学习了多级放大器的知识，多级放大器由输入级、中间级和输出级组成。多级放大器的耦合方式有阻容耦合和直接耦合跟变压器耦合。阻容耦合的优点是：前后级直流通路彼此
18、隔开，每一级的静态工作点都相互独立。便于分析、设计和应用。缺点是：信号在通过耦合电容加到下一级时会大幅度衰减。在集成电路里制造大电容很困难，所以阻容耦合只适用于分立元件电路。直接耦合的优点是：电路中没有大电容和变压器，能放大缓慢变化的信号，它在集成电路中得到广泛的应用。缺点是：前、后级直流电路相通，静态工作点相互牵制、相互影响，不利于分析和设计【布置作业】课后习题 141页第四题总结本节学习内容，加强理解文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6
19、J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2
20、V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E
21、5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4
22、U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9
23、N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J
24、1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3
25、A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5板书设计教学随笔1.多级放大电路在实际的电子设备中，为了得到足够大的增益或者考虑到输入电阻和输出电阻等特殊要求，放大器往往由多级组成。2.多级放大器的耦合方式1)阻容耦合阻容耦合就是利用电容作为耦合和隔直流元件的电路。2)直接耦合直接耦合是将前后级直接相连的一种耦合方式。3)变压器耦合变压器耦合是用变压器将前级的输出端与后级的输入端连接起来的方式。本节只是比较抽象，教学要耐心文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1
26、E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A
27、4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W
28、9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4
29、J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T
30、3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J
31、2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5文档编码:CW2T3A4U6J10 HW6J2W9N2V2 ZR2G7X4J1E5