Nyob rau hauv lub ntsej muag ntawm qhov project qhia ntawm RF tsim, ib qho ntawm cov lus tshaj plaws yog "dB". Rau ib tus kws tshaj lij RF, dB qee zaum paub zoo li nws lub npe. dB yog ib chav logarithmic uas muab txoj hauv kev yooj yim los qhia qhov sib piv, xws li qhov sib piv ntawm cov teeb liab tawm tswv yim thiab cov teeb liab tawm.
Txij li thaum dB yog qhov piv, nws yog ib chav tsev txheeb ze, tsis yog qhov tseeb. Qhov voltage ntawm lub teeb liab yog ntsuas kiag li, vim peb ib txwm hais tias muaj peev xwm sib txawv, uas yog, muaj peev xwm sib txawv ntawm ob lub ntsiab lus; Feem ntau peb xa mus rau qhov muaj peev xwm ntawm cov node txheeb ze rau 0 V hauv av node. Qhov tam sim no ntawm lub teeb liab kuj tau ntsuas kiag li, txij li chav tsev (ampere) suav nrog tus nqi tshwj xeeb rau lub sijhawm tshwj xeeb. Hauv qhov sib piv, dB yog ib chav tsev uas suav nrog lub logarithm ntawm qhov sib piv ntawm ob tus lej. Piv txwv li, amplifier nce: Yog hais tias lub hwj chim ntawm lub input teeb liab yog 1 W thiab lub hwj chim ntawm cov zis teeb liab yog 5 W, qhov ratio yog 5, uas converts rau dB yog 6.9897dB.
Yog li ntawd, lub amplifier muab lub zog nce ntawm 7dB, uas yog, qhov sib piv ntawm cov teeb liab tso tawm lub zog thiab lub teeb liab input zog tuaj yeem qhia tau tias yog 7dB.
Vim li cas thiaj siv dB?
Nws yog qhov ua tau los tsim thiab sim RF tshuab yam tsis siv dB, tab sis qhov tseeb, dB yog txhua yam. Ib qho txiaj ntsig yog tias qhov ntsuas dB tso cai rau peb nthuav qhia qhov sib piv loj heev yam tsis siv tus lej loj heev: 1,000,000 muaj lub zog nce ntawm 60dB nkaus xwb. Tsis tas li ntawd, tag nrho qhov nce lossis poob ntawm cov teeb liab sawb yog nyob rau hauv dB domain thiab yog ib qho yooj yim los xam vim hais tias tus neeg dB tus lej tsuas yog ntxiv (raws li yog tias peb siv cov piv txwv zoo tib yam, yuav tsum muaj ntau ntxiv).
Lwm qhov zoo dua yog qhov peb paub los ntawm cov kev paub ntawm cov ntxaij lim dej. RF tshuab tig ib ncig ntawm cov zaus thiab ntau txoj hauv kev uas cov zaus raug tsim, tswj, lossis cuam tshuam los ntawm cov khoom thiab cov kab mob parasitic Circuit Court. Qhov ntsuas dB yog qhov yooj yim hauv cov ntsiab lus no vim hais tias cov lus teb zaus yog qhov nkag siab thiab pom cov ntaub ntawv thaum cov zaus axis siv lub logarithmic nplai thiab qhov amplitude axis siv qhov ntsuas dB.
Yog li ntawd, nyob rau hauv tus txheej txheem ntawm kev tsim lub lim, nws yog ib qho tsim nyog yuav tsum tau ceev faj heev.
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Post lub sij hawm: Mar-04-2022
