電子學問題 - 考試
By Queena
at 2014-12-21T19:10
at 2014-12-21T19:10
Table of Contents
第一題:
http://imgur.com/vcYjiBf
這題在差動的部分該如何去算? 因為有Early Voltage所以要考慮ro?
但是考慮ro之後在小訊號部分怎麼去分壓算出相依電流源?
Beta電路基本上沒有問題,但是無回授A電路就沒辦法畫出來。
在回推答案之後得到A=92.04,但是怎麼湊就是得不出這個值...
第二題:
http://imgur.com/tW92IUO
第二題的M1偏壓寫錯了,是10uA才對...
12/22更新:
http://imgur.com/7KFwzDT
Vo和Vi之間的β要怎麼看? 因為Vo/Vi的答案是(-200)*0.947=-189.4
但是Vo/Vi並沒有除以(1+Aβ),不能算是Af吧?
第三題:
http://imgur.com/vt64Og4
這題差動是套公式進去算,答案是A1=4.62、A2=-8.25
但是我怎麼套就是得不出A2的答案,有人可以解答嗎?
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