Passive Band Pass Filtersinogona kugadzirwa nekubatanidza pamwe yakaderera pass sefa ine yakakwirira pass sefa
Iyo Passive Band Pass Filter inogona kushandiswa kupatsanura kana kusefa mamwe ma frequency ari mukati meimwe bhendi kana huwandu hwema frequency. Iyo yekucheka-kuremara frequency kana ƒc point mune yakapfava RC passive sefa inogona kunyatso kudzorwa uchishandisa chete resistor munhevedzano ine isina-polarized capacitor, uye zvichienderana nekuti yakabatana nzira ipi, isu taona kuti ingave iyo Low Pass kana High Pass sefa inowanikwa.
Kumwe kushandiswa kuri nyore kweaya marudzi emafirita epamhepo ari muodhiyo amplifier application kana maseketi senge mune loudspeaker crossover mafirita kana pre-amplifier toni zvinodzora. Dzimwe nguva zvinodikanwa kuti upfuure humwe huwandu hwemafrequency asingatangi pa 0Hz, (DC) kana kupera pane imwe yepamusoro frequency point asi ari mukati meimwe nhanho kana bhendi rema frequency, angave akatetepa kana akafara.
Nekubatanidza kana "cascading" pamwe chete yeLow Pass Filter yedunhu ine High Pass Filter wedunhu, tinogona kuburitsa imwe mhando yepassive RC sefa iyo inopfuura yakasarudzwa siyana kana "bhendi" yemafrequency anogona kuve akatetepa kana kupamhama uku achirebesa vese vari kunze kweiyo tambo. Iyi mhando nyowani yepasirefita kurongeka inoburitsa frequency yekusarudza sefa inozivikanwa seBand Pass Filter kana BPF kwenguva pfupi.
Kusiyana neiyo yakaderera pass sefa iyo inongopfuura masaini eyakaderera frequency renji kana iyo yakakwirira pass sefa iyo inopfuura masaini eyepamusoro frequency renji, Band Pass Filters inopfuudza masaini mukati meimwe "bhendi" kana "kupararira" kwema frequency pasina kukanganisa chiratidzo chekuisa kana kuunza imwe ruzha. Iri bhendi remafrequency rinogona kuve chero hupamhi uye rinowanzozivikanwa semasefa Bandwidth.
Bandwidth inowanzotsanangurwa seye frequency renji iripo pakati peaviri akataurwa frequency cut-off point ( ƒc ), ari 3dB pazasi penzvimbo yepamusoro kana resonant peak uchirebesa kana kunetesa mamwe kunze kwemapoinzi maviri aya.
Zvadaro nokuda kwekupararira kwakapararira, tinogona kungotsanangura izwi rokuti "bandwidth", BW seyo mutsauko pakati peiyo yakaderera-cut-off frequency (ƒcLOWER) uye yakakwirira-cut-off frequency (ƒcHIGHER) points. Mune mamwe mazwi, BW = ƒH - ƒL. Zviripachena kuti pass bhendi sefa ishande nemazvo, iyo yekucheka-frequency yeyakaderera pass sefa inofanirwa kunge yakakwira kupfuura yekucheka-kudzima frequency kune yakakwirira pass sefa.
Iyo "yakanaka" Band Pass Sefa inogona zvakare kushandiswa kupatsanura kana kusefa mamwe ma frequency ari mukati meimwe bhendi yema frequency, semuenzaniso, kudzima ruzha. Band pass mafirita anozivikanwa sesecond-order mafirita, (mbiri-pole) nekuti iwo ane "mbiri" reactive chinhu, iwo capacitor, mukati medunhu dhizaini. Imwe capacitor mune yakaderera pass circuit uye imwe capacitor mu high pass circuit.
Iyo Bode Plot kana frequency mhinduro curve pamusoro inoratidza maitiro ebhendi pass sefa. Pano chiratidzo chinodzikiswa pane yakaderera frequencies neinobuda ichiwedzera pamateru e +20dB/Decade (6dB/Octave) kudzamara frequency yasvika pa“pasi-chekuchekwa” point ƒL. Pane iyi frequency voltage inobuda zvakare 1/√2 = 70.7% yeiyo yekuisa chiratidzo kukosha kana -3dB (20*log(VOUT/VIN)) yekupinza.
Iyo inobuda inoenderera mberi nekuwanda kusvika yasvika "yepamusoro-chekuchekwa-kubvisa" poindi ƒH uko iyo inobuda inodzikira pamwero we -20dB/Decade (6dB/Octave) ichidzikisa chero yakakwira frequency masaini. Iyo poindi yekuwana yakakwira yekubuda kazhinji ndeye geometric zvinoreva maviri -3dB kukosha pakati pepasi nepamusoro-chekuchekwa mapoinzi uye inonzi "Centre Frequency" kana "Resonant Peak" kukosha ƒr. Iyi geometric zvinoreva kukosha kunoverengerwa sekuve ƒr 2 = ƒ(KUPEDZA) x ƒ(KUDZIDZA).
Aband pass filterinoonekwa sesefa yemhando yechipiri (mbiri-pole) nekuti ine "mbiri" inodzoreredza zvikamu mukati meiyo yedunhu chimiro, ipapo chikamu chekona chichava chakapetwa kaviri cheyakamboonekwa mafirita ekutanga, kureva, 180o. Iyo chikamu chekona yeinobuda chiratidzo inotungamira iyo yekupinza ne +90o kusvika pakati kana resonant frequency, ƒr point dai yave "zero" madhigirii (0o) kana "mu-chikamu" uye yozochinja kuLAG yekupinza ne -90o sezvo inobuda frequency inowedzera.
Iyo yepamusoro uye yakaderera-yekuchekwa-kubvisa frequency mapoinzi ebhendi pass sefa inogona kuwanikwa uchishandisa iyo yakafanana fomula seiyo kune ese akaderera uye akakwira pass mafirita, Semuyenzaniso.
Mauniti anouya akajairwa ane SMA kana N chidzitiro chekubatanidza, kana 2.92mm, 2.40mm, uye 1.85mm majoini epamusoro ma frequency ezvikamu.
Isu tinogona zvakare kugadzirisa iyo Band Pass Filter zvinoenderana nezvaunoda. Iwe unogona kupinda peji rekugadzirisa kuti upe zvakatemwa zvaunoda.
Nguva yekutumira: Sep-06-2022
