Lapho kubhekwa inkomba yephrojekthi yomklamo we-RF, elinye lamagama avame kakhulu elithi “dB”. Kunjiniyela we-RF, i-dB kwesinye isikhathi ijwayeleke njengegama layo. I-dB iyunithi ye-logarithmic enikeza indlela elula yokuveza izilinganiso, njengesilinganiso phakathi kwesignali yokufaka nesignali yokuphumayo.
Njengoba i-dB iyisilinganiso, iyiyunithi ehlobene, hhayi ngokuphelele. I-voltage yesignali ilinganiswa ngokuphelele, ngoba sihlala sithi umehluko ongase ube khona, okungukuthi, umehluko ongaba khona phakathi kwamaphuzu amabili; Ngokuvamile sibhekisela emandleni e-node ehlobene nendawo engu-0 V. Amandla wesignali nawo akalwa ngokuphelele, njengoba iyunithi (ampere) ihilela inani elithile lenkokhelo yesikhathi esithile. Ngokuphambene, i-dB iyunithi ebandakanya i-logarithm yesilinganiso phakathi kwezinombolo ezimbili. Isibonelo, ukuzuza kwe-amplifier: Uma amandla esignali yokufaka engu-1 W futhi amandla esignali yokuphumayo ingu-5 W, isilinganiso singu-5, esiguqulela ku-dB ngu-6.9897dB.
Ngakho-ke, i-amplifier inikeza inzuzo yamandla engu-7dB, okungukuthi, isilinganiso phakathi kwamandla esignali yokuphuma namandla esignali yokufaka ingavezwa njenge-7dB.
Kungani usebenzisa i-dB?
Impela kungenzeka ukuklama nokuhlola amasistimu e-RF ngaphandle kokusebenzisa i-dB, kodwa empeleni, i-dB itholakala yonke indawo. Enye inzuzo ukuthi isikali se-dB sisivumela ukuthi siveze izilinganiso ezinkulu kakhulu ngaphandle kokusebenzisa izinombolo ezinkulu kakhulu: i-1,000,000 inenzuzo yamandla engu-60dB kuphela. Ukwengeza, isamba senzuzo noma ukulahleka kochungechunge lwesignali kusizinda se-dB futhi kulula ukubala ngoba izinombolo ze-dB ngazinye zengezwa nje (kanti uma sisebenzisa izilinganiso ezijwayelekile, ukuphindaphinda kuyadingeka).
Enye inzuzo yilokho esikujwayele kusukela kokuhlangenwe nakho kwezihlungi. Amasistimu e-RF azungeza amaza kanye nezindlela ezahlukahlukene lapho amafrikhwensi enziwa, alawulwa, noma athintwe yizingxenye nezingxenye zesekethe ye-parasitic. Isikali se-dB sifanelekile kumongo onjalo ngenxa yokuthi isakhiwo sokuphendula imvamisa sinembile futhi sinolwazi olubonakalayo lapho i-axis yefrikhwensi isebenzisa isikali se-logarithmic kanye ne-axis ye-amplitude isebenzisa isikali se-dB.
Ngakho-ke, ngesikhathi sokuklama isihlungi, kuyadingeka ukuqaphela kakhulu.
We can design and produce customized filters for you, any questions you may have please contact us: sales@cdjx-mw.com
Isikhathi sokuthumela: Mar-04-2022
