Positive SSL
BLOCK
BLOCK
1 某一JFET，當ID = 4mA，IDSS = 16mA，VP = -4V ,求 VGS = ?
A 1
B 2
C -2
D -1
  

`I_D=I_(DSS)*(1-V_(GS)/V_P)^2`

`4m=16m*(1-V_(GS)/-4)^2`

`1/4=(1-V_(GS)/-4)^2`

`1/2=(1-V_(GS)/-4)`

`V_(GS)/-4 = 1/2`

`V_(GS) = -2`