103關務電子學與電路學 - 考試

前兩題
http://wwwc.moex.gov.tw/ExamQuesFiles/Question/103/103050_10760.pdf

自己在家算的 覺得答案好像怪怪的 研究一下吧

一、
(一)
10^-5
----- = e^(0.7-V_BE)/VT => V_BE=0.58 => R=0.58/10^-5 = 58k Ω
10^-3

(二) rπ = VT/IB = 260k Ω

(三) ro = VA/IC = 10M Ω

(四) Rout = 1+ro-R gm ro rπ/(R+2re+rπ) = 187.33M Ω


二、
(一)並並 B = If/Vo = -0.005
Rib=1.99k Ω Rob=100.05k Ω

(二)A= Rs||Rib||Rid x μ x Rob||RL / (ro + Rob||RL) =-4378827 V/A

Ri=Rs||Rib||Rid=0.6612k Ω Ro = Rob||RL = 1.961k Ω

Af = Vo/Is =A/(1+AB) = 200 V/A

Vo/Vs = -0.2 V/V

Rif=0.302Ω Rof = 0.09Ω => Rin=0.302Ω Rof=0.09Ω

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