[問題] 電路學
鐵特97 Q1.
http://wwwc.moex.gov.tw/ExamQuesFiles/Question/097/012108400.pdf
小弟最近在寫電子學和電路學的題目OPA 感覺有些衝突
但也可能是我觀念有嚴重的問題
像這一題 鐵特的電路學題目 要求OPA的增益
因為理想OPA i- = i+ = 0A
在第一個負回授OP可以解出V- = (1/3)*v2 - (2/3)*v1
且 V+ = (1/6)*v2
如果我令V+ = V- 即可解出正確解答 Vo = 2*v2-4*v1
但是V+ = V- 不是只有在負回授 線性區 才成立嗎?(第二個OP為正回授)
麻煩各位熱心的板友可以幫忙解惑 非常感謝您
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