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1 已知FET之ID = 3mA ，k = 3mA/V2 ，試求小信號互導增益 gm ？
A 18mS
B 9mS
C 6mS
D 3mS
  

`I_D = k(V_(GS)-V_T)^2`

`3m = 3m(V_(GS)-V_T)^2`

`(V_(GS)-V_T)^2`=1

`(V_(GS)-V_T)` = 1

`gm = 2k(V_(GS)-V_T)`

= 2*3m*1

= 6mS