Positive SSL
1 N 通道 JFET,假設 IDSS = 12mA,VGS(OFF) = -4V ,當VGS = -1.5V 時,求互導增益 gm ?
A 6mS
B 3.75mS
C 2.5mS
D 1.25mS

gm = `2|I_(DSS)/V_P|*(1-V_(GS)/V_P)`

= `2|(12m)/-4|*(1-(-1.5)/(-4))`

= `6m*2.5/4`

= 3.75mS