Positive SSL
BLOCK
BLOCK
1 如圖所示，RB1 = RB2 = 100kΩ、RE1 = RE2 = RC1 = RC2 = 1kΩ，β1=β2=100，rπ=1kΩ。求AV
A 2500
B -50
C -100
D 5000
  

Av = `V_o / V_i`

= `(-i_(c2)*1k) / (i_(b1)*1k)`

= `(-i_(b2)*100) / (i_(b1))` (`i_(b2)` = `-1/2i_(c1)`；100k省略，1kΩ 與1kΩ分流)

= `(1/2*i_(c1)*100) / (i_(b1))`

= `(1/2*i_(b1)*100*100) / (i_(b1))`

= 5000