场效应三极管放大电路的研究方法.pdf
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1、1/10 3.3 场效应三极管放大电路的分析方法3.3.1 共源组态基本放大电路对于采用场效应三极管的共源基本放大电路，可以与共射组态接法的基本放大电路相对应，只不过场效应三极管是电压控制电流源，即VCCS。共源组态的基本放大电路如图 03.28所示。与较共源和共射放大电路比较，它们只是在偏置电路和受控源的类型上有所不同。只要将微变等效电路画出，就是一个解电路的问题了。(a 采用结型场效应管 (b采用绝缘栅场效应管图03.28 共源组态接法基本放大电路(1 直流分析图03.29 共源基本放大电路的直流通路将共源基本放大电路的直流通路画出，如图03.29 所示。图中 Rg1、Rg2是栅极偏置电阻
2、，R是源极电阻，Rd是漏极负载电阻。与共射基本放大电路的Rb1、Rb2，Re和Rc分别一一对应。而且只要结型场效应管栅源PN 结是反偏工作，无栅流，那么JFET和MOSFET的直流通路和交流通路是一样的。2/10 根据图 03.29 可写出下列方程 VG=VDDRg2/(Rg1+Rg2 VGSQ=VGVS=VGIDQRIDQ=IDSS1(VGSQ/VGS2 VDSQ=VDDIDQ(Rd+R 于是可以解出 VGSQ、IDQ和VDSQ。(2 交流分析画出图 03.28电路的微变等效电路，如图03.30所示。与双极型三极管相比，输入电阻无穷大，相当开路。VCCS 的电流源s还并联了一个输出电阻 rd
3、s，在双极型三极管的简化模型中，因输出电阻很大视为开路，在此可暂时保留。其它部分与双极型三极管放大电路情况一样。图03.30 微变等效电路电压放大倍数输出电压为文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1
4、C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q
5、5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4
6、文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3
7、D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K
8、1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9
9、X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X43/10 如果有信号源内阻 RS时=gmRLRi/(Ri+RS 式中Ri是放大电路的输入电阻。输入电阻R
10、i=Rg1Rg2输出电阻为计算放大电路的输出电阻，可按双口网络计算原则将放大电路画成图03.31的形式。图03.31 计算Ro的电路模型将负载电阻 RL开路，并想象在输出端加上一个电源，将输入电压信号源短路，但保留内阻。然后计算，于是Ro=rdsRd 3.3.2 共漏组态基本放大电路共漏组态基本放大电路如图03.32所示，其直流工作状态和动态分析如下。文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4
11、文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3
12、D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K
13、1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9
14、X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10
15、D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T
16、3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6
17、I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X44/10 图03.32 共漏组态放大电路图03.33 共漏放大电路的直流通路(1 直流分析将共漏组态接法基本放大电路的直流通路画于图03.33之中，于是有VG=VDDRg2/(Rg1+Rg2 VGSQ=VGVS=VGIDQRIDQ=IDSS1(VGSQ/VGSoff2VDSQ=VDDIDQR由此可以解出 VGSQ、IDQ和VDSQ。(2 交流分析将图03.32的CD 放大电路的微变等效电路画出，如图03.34所示。图03.34 共漏放大电路的微变等效电路电压放大倍数由图03.34可知文档编码:CX2O10
18、D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T
19、3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6
20、I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O
21、10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I
22、6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6
23、B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX
24、2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X45/10 式中RL=R/RL。为正，表示输入与输出同相，当gmRL1时，1。比较共源和共漏组态放大电路的电压放大倍数公式，分子都是gmRL，分母对共源放大电路是 1，对共漏放大电路是(1+gmRL。输入电阻输出电阻计算输出电阻的原则与其它组态相同，将图03.34 改画为图 03.35。
25、图03.35 求输出电阻的微变等效电路3.3.3 共栅组态基本放大电路共栅组态放大电路如图 03.36 所示，其微变等效电路如图03.37 所示。文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I6T3K1Q5 ZP6T6B6I9X4文档编码:CX2O10D3D1C3 HV3I
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