Re: [理工] [電子]-回授

看板Grad-ProbAsk作者Maxwell5566 (none)時間13年前 (2011/01/18 15:01)推噓1(1推 0噓 0→)

留言1則, 1人參與討論串5/6 (看更多)

※ 引述《serflygod (serflygod)》之銘言： : http://i215.photobucket.com/albums/cc91/serflygod/007-2.jpg

: http://i215.photobucket.com/albums/cc91/serflygod/008-1.jpg

: 如題 : 我算出來的跟答案不同 : 不知道哪裡錯了 : 懇請指點因是是shunt-shunt： open-loop gain Vo --- = (-gm)(Rs//RF)(Rd//RF) Iin -1 beta = --- RF close-loop gain Vo (-gm)(Rs//RF)(Rd//RF)RF --- = ------------------------- Iin RF + gm(Rs//RF)(Rd//RF) Vo 1 Vo 1 (-gm)(Rs//RF)(Rd//RF)RF --- = --- x --- = --- x ----------------------- Vin Rs Iin Rs RF + gm(Rs//RF)(Rd//RF) (1) (2) (2)的分子有(Rs//RF) = (Rs*RF)/(Rs+RF)跟 (1)分母的Rs 消掉所以剩RF/(Rs+RF) (2)在上下同乘(Rs+RF)/RF 就可以得到 Vo (-gm)(Rd//RF)RF --- = --------------------- Vin Rs + RF + gm(Rd//RF)Rs 參考看看囉 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.114.123.102

推

orz3qonz

01/22 22:02, , 1^F

01/22 22:02, 1^F

‣ 返回看板[ Grad-ProbAsk ] 研究

‣ 更多 Maxwell5566 的文章

文章代碼(AID): #1DDJhY3O (Grad-ProbAsk)