Re: [理工] [電子]-等效電路
※ 引述《msu (do my best)》之銘言：
: 請問各位在我圖上有打問號的地方
: http://www.wretch.cc/album/show.php?i=msuPTT&b=1&f=1364059495&p=9
: Rgs Rgd Rds
: 那些的Vt,It是流經哪些電阻呢?
: 感謝各位的解答
RG = 0.3k ， Rs = 2k ， Rd = 80k ， RL = 20k ， gm = 2 mA/V
RG+[RS//(Rd+RL)]
Rgso = -------------------
gmRdRS
1 + ----------
RS+Rd+RL
gmRdRL
Rgdo = (1 + -----------------)*RG +{ [(1+gmRd)RS + Rd] //RL }
(1+gmRd)RS+Rd+RL
(RS+RL)(RL//Rd)
Rdso = -------------------
gmRS(RL//Rd)+RL
--------------------------------------------------------------------
PS:數值帶進去就是裡面的答案了，這題不好拿分，光求電阻就要20分鐘
整題算出來起碼也要25分鐘(plus check的動作)，這題價值匪淺阿XD
尤其Rdso它要用KVL、KCL才做的出來，這個我做最慢，
其他的等效電路可以馬上做出來，這題20~25分應該跑不掉 呵呵!
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