[理工] [電子]一個回授觀念問題
各位好!
附上這段敘述的圖片http://i.imgur.com/iBALe.jpg
敘述如下:
前文大概是說 這裡的回授分析方法是在假設(幾乎)所有的前授transmission
都出現在basic amplifier端，且(幾乎)所有的回授transmission都出現在
回授網路。(怕我個人有曲解意思附上原文一下..)
原文:
The feedback analysis method is predicated on the assumption that
all (or most) of the feedforward transmission occurs in the basic
amplifier and all(or most) of the feedback transmission occurs in
the feedback network.
然後我有問題是在後面的其中一小段敘述..
Also,as long as gm is much larger than 1/Rf, the assumption that
most of the feedforward transmission occurs in the basic amplifier
is valid,and thus the feedback analysis is reasonably accurate.
問題點:為何只要gm >> 1/Rf,則前授大部分會出現在基本放大器的假設
就會成立? 那如果要feedback的假設→feedback transmission(幾乎)都傳到
回授網路端也成立的話..條件又是什麼呢?
(第一次讀回授這一塊觀念還不是很清楚!還希望各位高手指導一下!!感謝!)
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人生..何嘗不就是不斷的擺脫眼前的阻撓
然而，終究有天得回歸原本的最初~
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※ 編輯: kela12340 來自: 1.175.128.231 (03/21 11:55)
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