Ua cov amplification circuits yuav tsum muaj DC fais fab mov kom ua haujlwm zoo
Vim hais tias lub amplifier tsis tau amplify tus thawj teeb liab. Lub teeb liab tso zis los ntawm lub amplifier feem ntau yog lub zog tshiab tau txais los ntawm lub hwj chim mov, thiab muaj me ntsis ua nrog lub teeb liab amplified. Lub thiaj li hu ua "amplification" yog ib qho illusion xwb.
Raws li ib tug transistor, ua hauj lwm nyob rau hauv ib tug hloov lub xeev yog sib npaug rau qhib ib tug loj hloov nrog ib tug me me tam sim no; Yog hais tias ua hauj lwm nyob rau hauv lub amplified lub xeev, lub degree ntawm qhib ntawm no hloov yuav txawv nrog variation ntawm no me me tam sim no. Cov khoom siv hluav taws xob "tsim nyog" hais los ntawm tus neeg nug yog hais txog qhov voltage thiab tam sim no uas lub zog hluav taws xob tuaj yeem muab tau, uas yuav tsum siab dua qhov voltage thiab tam sim no hauv lub teeb liab amplified. Vim hais tias lub ntsiab lus ntawm "amplification" yog los qhia lub zog tshiab thiab tso tawm lub zog ntawm lub zog tshiab no synchronously raws li kev hloov pauv ntawm lub teeb liab amplified thiab ob peb zaug nws qhov kev siv, thiab tom qab ntawd siv nws los "ua tus" lub teeb liab amplified thiab tso tawm nws. rau tus neeg siv (load). Pom tseeb, yog tias cov khoom siv hluav taws xob muab los ntawm lub tshuab hluav taws xob tsis haum (xws li siv 3W fais fab mov rau lub zog 5W amplifier), lub amplifier tsis tuaj yeem ua haujlwm zoo.
Nws yog lub sab sauv thiab qis qis resistors ntawm lub transistor, muab lub hauv paus voltage xav tau rau kev ua haujlwm ntawm transistor. R3 yog ib qho khoom thauj khoom, thiab cov amplified tam sim no yuav tsim ib qho hluav taws xob poob ntawm no. Qhov no tas li hloov voltage yog qhov hu ua "amplified" teeb liab.
