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1 已知交流互導增益 gm = 60 mA/V、rπ = 2.5kΩ、VT = 25mV ，則 β =？
A 100
B 150
C 200
D 250
  

`g_m` = `I_C/V_T`

`r_π` = `V_T/I_B`

`g_m * r_π ` = `(I_C / V_T)*(V_T/I_B)`

= `I_C / I_B` = β = 60m*2.5k = 150