Izihluzi zePassive Band Passingenziwa ngokudibanisa kunye isihluzo sokupasa esisezantsi kunye nesihluzo sokupasa okuphezulu
I-Passive Band Pass Filter ingasetyenziselwa ukwahlula okanye ukuhluza iifrikhwensi ezithile ezilele ngaphakathi kwebhendi ethile okanye uluhlu lwamaza. I-frequency cut-off frequency or ƒc point in simple RC passive filter inokulawulwa ngokuchanekileyo kusetyenziswa i-resistor enye nje kuthotho kunye ne-non-polarized capacitor, kwaye kuxhomekeke kwindlela ezizijikeleze ngayo, siye sabona ukuba i-Low Pass okanye i-High Pass filter ifunyenwe.
Olunye usetyenziso olulula kwezi ntlobo zezihluzi zokwenziwa kusetyenziso lwesandisi-lizwi okanye iisekethe ezifana nezihluzo zesandisi-lizwi esinqamlezayo okanye ulawulo lwethowuni yangaphambili. Ngamanye amaxesha kuyimfuneko ukudlula kuphela uluhlu oluthile lweefrikhwensi ezingaqalisi ku-0Hz, (DC) okanye ziphele kwindawo ethile ephezulu kodwa ziphakathi koluhlu oluthile okanye ibhanti yeefrikhwensi, nokuba zimxinwa okanye zibanzi.
Ngokudibanisa okanye "i-cascading" kunye nesekethe enye ye-Low Pass Filter kunye nesekethe ye-High Pass Filter, sinokuvelisa olunye uhlobo lwe-RC ye-passive filter edlula uluhlu olukhethiweyo okanye "ibhendi" yeefrikhwensi ezinokuthi zibe zincinci okanye zibanzi ngelixa zinciphisa bonke abo bangaphandle kolu luhlu. Olu hlobo lutsha lolungiselelo lwesihluzo esingenakwenziwa luvelisa isihluzo esikhethiweyo esiqhelekileyo eyaziwa njengeBand Pass Filter okanye iBPF ngokufutshane.
Ngokungafaniyo nesihluzi sokudlula esisezantsi esigqithisa kuphela imiqondiso yoluhlu oluphantsi lwamaza okanye isihluzi sokupasa okuphezulu esigqithisa imiqondiso yoluhlu oluphezulu lwefrikhwensi, iBand Pass Filters idlulisa imiqondiso ngaphakathi “kwebhendi” ethile okanye “ukusasazwa” kwamaza ngaphandle kokuphazamisa isiginali yegalelo okanye ukwazisa ingxolo eyongezelelweyo. Eli bhanti yefrikhwensi inokuba nabuphi na ububanzi kwaye yaziwa ngokuba zizihluzi Bandwidth.
I-Bandwidth idla ngokuchazwa njengoluhlu lwefrikhwensi ekhoyo phakathi kwamanqaku amabini achaziweyo okunqunyulwa kwamaza ( ƒc ), angu-3dB ngaphantsi kowona mmandla mkhulu okanye incopho yeresonant ngelixa ucutha okanye usenza buthathaka ezinye ngaphandle kwala manqaku mabini.
Emva koko kwii-frequencies ezisasazeka ngokubanzi, sinokuchaza nje igama elithi "bandwidth", i-BW njengomahluko phakathi kwe-frequency cut-off frequency (ƒcLOWER) kunye ne-high cut-off frequency (ƒcHIGHER) amanqaku. Ngamanye amazwi, BW = ƒH – ƒL. Ngokucacileyo ukuze isihluzo sebhendi yokupasa sisebenze ngokuchanekileyo, isihluzo esinqunyiweyo sesihluzo sokupasa esisezantsi kufuneka sibe phezulu kunesikwa esinqunyiweyo kwisihluzo sokupasa okuphezulu.
Isihluzo "esifanelekileyo" se-Band Pass singasetyenziselwa ukwahlula okanye ukuhluza iifrikhwensi ezithile ezingaphakathi kwebhanti ethile yamaza, umzekelo, ukurhoxiswa kwengxolo. Izihluzi zokudlula ibhendi zaziwa ngokubanzi njengezihluzi zodidi lwesibini, (iipali ezimbini) kuba zinecandelo “ezimbini” ezisebenzayo, ii-capacitors, ngaphakathi koyilo lwesekethe. Enye i-capacitor kwisekethe yokupasa ephantsi kunye nenye i-capacitor kwi-high pass circuit.
I-Bode Plot okanye ijiko lokuphendula rhoqo ngasentla libonisa iimpawu zesihluzo sokupasa band. Apha isignali ithotywa kwii-frequencies ezisezantsi kunye nemveliso ekhulayo kwi-slope ye-+20dB / ishumi leminyaka (6dB/Octave) de i-frequency ifike kwindawo "yokunqunyulwa okusezantsi" ƒL. Kulo mzuzwana i-voltage ephumayo iphinda i-1 / √2 = 70.7% yexabiso lesignali yegalelo okanye -3dB (20 * log (VOUT / VIN)) yegalelo.
Imveliso iqhubeka ngenzuzo ephezulu de ifike kwindawo "yokunqunyulwa okuphezulu" ƒH apho imveliso iyancipha kwireyithi ye -20dB/Decade (6dB/Octave) ithomalalisa naziphi na iisignali eziphezulu. Inqaku lemveliso elona liphezulu lithetha ngejiyometri yexabiso le-2 -3dB phakathi kweendawo ezisikiweyo ezisezantsi nezingaphezulu kwaye ibizwa ngokuba yi-“Centre Frequency” okanye “Resonant Peak” ixabiso ƒr. Eli xabiso lentsingiselo yejiyometri libalwa ngokuthi ƒr 2 = ƒ(UPPER) x ƒ(AMAPHANTSI).
Aband pass filterithathwa njenge-second-order (i-pole-pole) yodidi lokucoca ngenxa yokuba inamacandelo "ezimbini" asebenzayo ngaphakathi kwesakhiwo sesiphaluka sayo, ngoko i-angle yesigaba iya kuba kabini kwiifilitha ezibonwe ngaphambili, oko kukuthi, i-180o. I-engile yesigaba sophawu oluphumayo I-LEADS leyo yegalelo nge +90o ukuya embindini okanye i-resonant frequency, ƒr inqaku xa inokuba "zero" degrees (0o) okanye "kwisigaba" kwaye emva koko itshintshela kwi-LAG igalelo ngo -90o njengoko imveliso inyuka.
Amanqaku aphezulu kunye nasezantsi anqunyulwe amaza okucoca ibhendi yokupasa anokufunyanwa kusetyenziswa ifomula efanayo naleyo yazo zombini izihluzi zokupasa ezisezantsi neziphezulu, Umzekelo.
Iiyunithi ziza kumgangatho kunye ne-SMA okanye i-N iziqhagamshelo zabasetyhini, okanye i-2.92mm, 2.40mm, kunye ne-1.85mm izihlanganisi zamacandelo aphezulu.
Sisenokwenza iBand Pass Filter ngokweemfuno zakho. Ungangenisa iphepha lokulungiselela ukubonelela ngeenkcukacha ozifunayo.
Ixesha lokuposa: Sep-06-2022
