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1 若BJT電晶體工作在主動區，且基極直流偏壓電流為12.5μA，β=80，熱當電壓(thermal voltage)VT = 25mV，求轉移電導 gm?(103統測)
A 2mA/V
B 6mA/V
C 20mA/V
D 40mA/V
  

公式：`g_m` = `1/(r_e)`

`r_e` = `(V_T)/(I_E)` ；`r_e` = `(25m)/(12.5μ*80)` = 25Ω；`g_m` = `1/(25)` = 40 (mA/V)