Akamaro ka dB mugushushanya RF

Imbere yerekana umushinga werekana igishushanyo cya RF, rimwe mumagambo akunze kugaragara ni "dB". Kuri injeniyeri ya RF, dB rimwe na rimwe imenyerewe nkizina ryayo. dB ni logarithmic unit itanga uburyo bworoshye bwo kwerekana ibipimo, nkikigereranyo kiri hagati yikimenyetso cyinjiza nibisohoka.

Kubera ko dB ari igipimo, ni igice gifitanye isano, ntabwo cyuzuye. Umuvuduko wikimenyetso wapimwe rwose, kuko burigihe tuvuga itandukaniro rishobora kubaho, ni ukuvuga itandukaniro rishobora kuba hagati yingingo ebyiri; Mubisanzwe twerekeza kubushobozi bwa node ugereranije na 0 V y'ubutaka. Ikimenyetso cyibimenyetso nacyo gipimwa rwose, kubera ko igice (ampere) kirimo umubare wamafaranga yishyurwa mugihe runaka. Ibinyuranye, dB nigice kirimo logarithm yikigereranyo kiri hagati yimibare ibiri. Kurugero, inyungu ziyongera: Niba imbaraga zikimenyetso cyinjiza ari 1 W naho imbaraga zicyapa gisohoka ni 5 W, igipimo ni 5, gihinduka kuri dB ni 6.9897dB.

Kubwibyo, amplifier itanga imbaraga zingana na 7dB, ni ukuvuga, ikigereranyo kiri hagati yimbaraga zerekana ibimenyetso nimbaraga zo kwinjiza ibimenyetso bishobora kugaragazwa nka 7dB.

Kuki ukoresha dB?

Birashoboka rwose gushushanya no kugerageza sisitemu ya RF udakoresheje dB, ariko mubyukuri, dB irahari hose. Inyungu imwe nuko igipimo cya dB kidufasha kwerekana ibipimo binini cyane tudakoresheje umubare munini cyane: 1.000.000 bifite inyungu zingana na 60dB gusa. Mubyongeyeho, inyungu zose cyangwa igihombo cyurunigi rwibimenyetso biri murwego rwa dB kandi biroroshye kubara kuko nimero ya dB kugiti cye yongeweho gusa (mugihe niba dukoresha ibipimo bisanzwe, kugwiza birasabwa).

Iyindi nyungu nicyo tumenyereye duhereye kuburambe bwa filteri. Sisitemu ya RF izenguruka kuri frequence hamwe nuburyo butandukanye aho imirongo ikorwa, igenzurwa, cyangwa ikagira ingaruka nibice bigize parasitike. Igipimo cya dB cyoroheye murwego nkurwo kuko umugambi wo gusubiza inshuro usobanutse kandi utanga amakuru mugihe umurongo wa axe ukoresha igipimo cya logarithmic naho amplitude axis ikoresha igipimo cya dB.

Kubwibyo, murwego rwo gushushanya akayunguruzo, ni ngombwa kwitonda cyane.

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