Dab tsi yog input resistance, output resistance, thiab output resistance
Lub input tsis kam yog qhov sib npaug tiv thaiv pom los ntawm cov tswv yim kawg ntawm lub amplification Circuit Court, thiab yog qhov ntsuas kev ua tau zoo siv los ntsuas qhov cuam tshuam ntawm lub amplifier ntawm lub teeb liab. Qhov loj dua qhov input tsis kam, qhov me me tam sim no coj los ntawm amplifier los ntawm lub teeb liab qhov chaw, thiab qhov siab dua lub teeb liab voltage tau los ntawm lub input kawg ntawm lub amplifier. Ntawd yog, tsawg attenuation ntawm lub teeb liab qhov voltage. Peb=Rs+Ri * IoRs yog qhov kev tiv thaiv sab hauv ntawm lub teeb liab, thiab RI yog qhov kev tawm tsam ntawm lub amplifier.
Yog li ntawd, lub amplification Circuit Court ntawm cov twj paj nruag xws li oscilloscopes thiab voltmeters siv los ntsuas cov teeb liab voltage yuav tsum muaj ib tug loj input kuj. Yog tias koj xav kom tau txais qhov loj dua tam sim no los ntawm lub teeb liab qhov chaw, koj yuav tsum ua kom lub amplifier muaj ib qho kev tawm tswv yim me me.
Cov zis tsis kam yog qhov pom tseeb tsis kam pom los ntawm cov zis ntawm lub amplifier. Yog hais tias lub amplifier yog saib raws li lub teeb liab qhov chaw, nws yog lub internal kuj ntawm lub teeb liab qhov chaw. Cov zis kuj yog siv los ntsuas lub zog ntawm lub amplifier lub load nqa peev xwm. Thaum lub amplifier outputs lub amplified teeb liab mus rau lub load resistor RL, lub amplifier yuav sib npaug rau muaj ib tug internal resistance R.
Lub teeb liab qhov chaw muab cov teeb liab tawm qhov hluav taws xob thiab cov teeb liab tawm tam sim no rau RL los ntawm qhov chaw teeb liab no. RO yog hu ua qhov tso zis tsis kam ntawm lub tshuab hluav taws xob, uas yog qhov sib npaug ntawm tib neeg kev sib txuas lus los ntawm cov zis kawg ntawm lub amplifier mus rau lub amplifier nws tus kheej. Yog tias qhov tso zis tawm tsam RO tsawg heev thiab ua tau raws li qhov xwm txheej ntawm RO Tsawg dua lossis sib npaug rau RL, tom qab ntawd thaum RL hloov pauv ntau yam, cov teeb liab tso zis hluav taws xob tuaj yeem tswj tau tas li.
Ntawm qhov tsis sib xws, yog tias cov zis tawm tsam RO loj thiab ua tau raws li cov xwm txheej ntawm RO Ntau dua lossis sib npaug rau RL, tom qab ntawd thaum RL hloov pauv ntau yam, cov teeb liab tawm tam sim no tuaj yeem khaws cia. Lub peev xwm ntawm lub tshuab hluav taws xob kom tswj tau qhov tso tawm qhov hluav taws xob tas li (lossis tam sim no) nyob rau hauv cov xwm txheej sib txawv yog hu ua load nqa peev xwm. Cov zis tsis kam RO yog qhov ntsuas kev ua tau zoo uas ua rau lub peev xwm no.
Lub input impedance ntawm lub lag luam amplifier yog siab heev (ntau tshaj 1M los yog ntau tshaj), yog li tsis muaj tus nqi ntawm cov kuj (1K-100K) nyob rau hauv series yuav cuam tshuam cov nyhuv tiag tiag.
Qhov resistor no tseem tuaj yeem suav tias yog qhov txwv tam sim no, vim tias tsis muaj qhov xav tau tam sim no txwv. Internal resistance ntawm lub lag luam amplifier yog siab dhau lawm, thiab cov input tam sim no nws tus kheej yog heev me me.
