104年 經濟部 電子學 - 考試
By Ophelia
at 2016-09-11T17:39
at 2016-09-11T17:39
Table of Contents
[考題] 國考歷屆考題與考題觀念討論(書裡看到的選這個)請附上想法、出處
http://imgur.com/a/vTFgg
請問這題左下跟右上的BJT截止嗎?
參考書的詳解
ID=Io=[β/(1+β)]*IE
IR=ID+[1/(1+β)]*IE=IE
Io=[β/(1+β)]*IR
IR=[β/(1+β)]*Vs/R
(↑這邊一直想不通為何[β/(1+β)]*Vs/R 而不是Vs/R)
Io=(β/(1+β))^2*Vs/R
謝謝
--
http://imgur.com/a/vTFgg
請問這題左下跟右上的BJT截止嗎?
參考書的詳解
ID=Io=[β/(1+β)]*IE
IR=ID+[1/(1+β)]*IE=IE
Io=[β/(1+β)]*IR
IR=[β/(1+β)]*Vs/R
(↑這邊一直想不通為何[β/(1+β)]*Vs/R 而不是Vs/R)
Io=(β/(1+β))^2*Vs/R
謝謝
--
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考試
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