BKO0C2115H07
BA94F0F0102
BKO0C2115H07
CPS-420F
由于運算放大器的開環(huán)電壓放大倍數(shù)很高,當(dāng)它工作在線性區(qū)時必須引入深度負(fù)反饋。因此,它的輸出與輸入之間的關(guān)系基本決定于反饋電路和輸入電路的結(jié)構(gòu)與參數(shù),而與運放本身的參數(shù)關(guān)系不大。改變輸入電路和反饋電路的結(jié)構(gòu)和形式,就可以實現(xiàn)不同的運算。
負(fù)反饋的類型有:電壓串聯(lián)負(fù)反饋;電壓并聯(lián)負(fù)反饋;電流串聯(lián)負(fù)反饋;電流并聯(lián)負(fù)反饋。
反饋電路直接從輸出端引出的,是電壓反饋;從負(fù)載電阻靠近“地”端引出的,是電流反饋;(也可將輸出端短路,若反饋量為零,則為電壓反饋;若反饋量不為零,則為電流反饋。) 輸入信號和反饋信號分別加在兩個輸入端,是串聯(lián)反饋;加在同一輸入端的是并聯(lián)反饋;反饋信號使凈輸入信號減小的,是負(fù)反饋。
負(fù)反饋的對放大電路工作性能的影響:提高放大電路的穩(wěn)定性;改善波形失真;
對輸入電阻和輸出電阻的影響:電壓反饋使輸出電阻降低;電流反饋使輸出電阻增高;串聯(lián)反饋使輸入電阻增高;并聯(lián)反饋使輸入電阻降低;
電子電路中的運算放大器,有同相輸入端和反相輸入端,輸入端的極性和輸出端是同一極性的就是同相放大器,而輸入端的極性和輸出端相反極性的則稱為反相放大器。
聯(lián)系人:王工
電話:15506917382
座機:0591-62182535
QQ:583745937
傳真:0591-22989937
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