![](https://www.icode9.com/i/l/?n=20&i=blog/1093960/202102/1093960-20210216192834395-1062436831.png)
Vout = Δid·Rs
Δid = Gm·Vin
则可计算出 Av = ______
PS:Gm 可通过3.3.6节的公式直接计算
-
方法二:戴维南![](https://www.icode9.com/i/l/?n=20&i=blog/1093960/202102/1093960-20210216193903248-2137502386.png)
1. 求等效电压
将 1/gmb 断开,此时输出回路没有电流,即V1 = 0, Vx = Vin
2. 求等效电阻
将 1/gmb 视为负载,不考虑,将输入 Vin 短路,等效电阻为 1/gm
3. 计算Av
戴维南等效电路中:
![](https://www.icode9.com/i/l/?n=20&i=blog/1093960/202102/1093960-20210216194745724-1078584403.png)
标签:gmb,戴维南,Vin,跟随,等效,3.4,Av,id
来源: https://www.cnblogs.com/ppue/p/14407353.html