Mos amplifier
Common Source(CS) Stage = BJT CE
Common Source(CS) Stage = BJT CE


Operation in Saturation


- 为了保持饱和状态,Vout不能低于Vin 通过增加一个阀值(Threshould)电压。
λ=0 and λ≠0
λ=0

λ≠0 early effect

早期效应和通道调制影响CS和CE。
CS
CS stage with Current Source Load



为了缓解Headroom问题,使用电流源负载
因为电流源有着较高的输出电阻,可以容忍小电压压降。


PMOS为输入极,NMOS为负载,电压增益与之前相同。
CS Stage with Diode-Connected Load



增益较低,但是减少过程参数的依赖。
CS stage with Gate Resistance

No Current, so Vg = 0.
Ouput Impedance of CS Stage with Degeneration



与BJT的degeneration相似。
- Example1


- Example 2


CG

输入的上升导致输出的上升,所以增益是正的
CG stage with Source Resistance



有源电阻存在时,电压增益等于有CS级的电压增益,只是是正的。
Example


CG stage with Biasing


CD
CD satge


CD = CC
Example


Example complex
Example of a CS stage(1)


Example of a CS stage(2)


Example of CS and CG stages




Example of Composite stage(1)


Example of a Composite Stage(2)

