Nhau

Sefa isingashande, inozivikanwawo seLC filter, icircuit yefirita ine inductance, capacitance uye resistance, iyo inogona kusefa imwe kana kupfuura harmonics. Chimiro chefirita chinoshandiswa zvakanyanya uye chiri nyore kushandisa ndechekubatanidza inductance uye capacitance muzvikamu zvakatevedzana, izvo zvinogona kugadzira low impedance bypass ye main harmonics (3, 5 na 7); Single tuned filter, double tuned filter uye high pass filter zvese ma passive filters.
mukana
Sefa isingashande ine zvakanakira zvechimiro chiri nyore, mutengo wakaderera, kuvimbika kwekushanda kwepamusoro uye mutengo wakaderera wekushanda. Ichiri kushandiswa zvakanyanya senzira yekudzora inoenderana.
kupatsanura
Hunhu hweLC filter hunofanira kusangana nezvinodiwa zvetechnical index. Izvi zvinodiwa zvetechnical zvinowanzo shanda mu attenuation mu frequency domain, kana phase shift, kana zvese zviri zviviri; Dzimwe nguva, zvinodiwa zve time response mu time domain zvinokurudzirwa. Passive filters dzinogona kukamurwa muzvikamu zviviri: tuned filters uye high pass filters. Panguva imwe chete, zvichienderana nenzira dzakasiyana dzekugadzira, inogona kukamurwa mu image parameter filter uye working parameter filter.
Sefa yekugadzirisa
Sefa yekuisa zvinhu muchimiro che "tuning" inosanganisira sefa imwe chete yekuisa zvinhu muchimiro che "tuning" uye sefa yekuisa zvinhu muchimiro che "double tuning", iyo inogona kusefa imwe chete (single tuning) kana mbiri (double tuning) harmonics. Kuwanda kwema "harmonics" kunonzi "resonant frequency" ye "tuning filter".
Sefa yepamusoro
Sefa yeHigh pass, inozivikanwawo seAmplitude Reduction filter, inonyanya kusanganisira first-order high pass filter, second-order high pass filter, third-order high pass filter uye C-type filter, izvo zvinoshandiswa kuderedza zvakanyanya harmonics yakaderera pane imwe frequency, iyo inonzi cut-off frequency yehigh pass filter.
Sefa yeparamita yemufananidzo
Sefa iyi yakagadzirwa uye inoshandiswa zvichibva padzidziso yemaparamita emifananidzo. Sefa iyi inoumbwa nezvikamu zvinoverengeka zvekutanga (kana hafu yezvikamu) zvakakamurwa zvichienderana nepfungwa yekuenzana kwemufananidzo pakubatana. Chikamu chekutanga chinogona kukamurwa kuita mhando yeK-yakagadzirwa uye mhando yem-yakagadzirwa zvichienderana nechimiro chedunhu. Tichitora sefa yeLC low-pass semuenzaniso, kudzika kwebhendi yechikamu cheK-yakagadzirwa kunowedzera kamwe chete nekuwedzera kwefrequency; Node yem-yakagadzirwa ine low-pass basic ine attenuation peak pane imwe frequency mu stopband, uye nzvimbo ye attenuation peak inodzorwa ne m value mu node yem-yakagadzirwa. Kune low-pass filter inoumbwa nezvikamu zveCascaded Low-Pass, attenuation inoumbwa yakaenzana nehuwandu hwe inherent attenuation yechikamu chimwe nechimwe chekutanga. Kana impedance yemukati uye impedance yemutoro wemagetsi anogumiswa kumativi ese efirita zvakaenzana ne impedance yemufananidzo kumativi ese, attenuation yekushanda uye phase shift yefirita zvakaenzana ne attenuation yavo yemukati uye phase shift zvakateerana. (a) Firita iri kuratidzwa ine chikamu cheK chakagadzika uye zvikamu zviviri zvakatorwa mu cascade. Z π na Z π m ndiwo impedance yemufananidzo. (b) Inoratidza frequency ye attenuation. Nzvimbo dze attenuation peaks mbiri /f ∞ 1 na f ∞ 2 mu stopband zvinotsanangurwa ne m values ​​dze m mbiri dzakatorwa.
Saizvozvowo, mafirita ehigh pass, band-pass uye band stop anogonawo kuumbwa nezvikamu zvekutanga zvinoenderana.
Kudzivirira kwemufananidzo kwefirita hakugone kuenzana nekudzivisa kwemukati kwesimba remagetsi uye kupindira kwemutoro mubhendi rese rema frequency (musiyano mukuru mubhendi rekudzikisa), uye kuderedzwa kwemukati uye kuderedzwa kwekushanda zvakasiyana zvikuru mubhendi redziviriro. Kuti zvive nechokwadi chekuti zviratidzo zvehunyanzvi zviri kuzadzikiswa, zvinowanzo dikanwa kuchengetedza mukana wakakwana wekudzikisa wemukati uye kuwedzera upamhi hwebhendi redziviriro mudhizaini.
Sefa yeparamita yekushandisa
Iyi sefa haina zvikamu zvekutanga zvakakamurwa, asi inoshandisa mabasa enetwork anogona kuonekwa nemuviri neR, l, C uye mutual inductance elements kuti iongorore nemazvo technical specifications ye filter, uye yobva yaona filter circuit inoenderana ne network functions yakawanikwa. Zvichienderana ne approximation criteria dzakasiyana, mabasa akasiyana enetwork anogona kuwanikwa, uye marudzi akasiyana e filters anogona kuonekwa. (a) Ndiwo hunhu hwe low-pass filter inoonekwa ne flattest amplitude approximation (bertowitz approximation); Passband ndiyo inonyanya kupfava pedyo ne zero frequency, uye attenuation inowedzera monotonical kana yasvika stopband. (c) Ndiwo hunhu hwe low-pass filter inoonekwa ne equal ripple approximation (Chebyshev approximation); Attenuation mu passband inochinja pakati pe zero ne upper limit, uye inowedzera monotonical mu stopband. (e) Inoshandisa elliptic function approximation kuti ione hunhu hwe low-pass filter, uye attenuation inopa constant voltage change mu pass band ne stop band. (g) Hunhu hwefirita yepasi yakaderera hunowanikwa ne; Kudzikira kwepasi mubhandi repasi kunochinja-chinja muhukuru hwakaenzana, uye kudzikira kwepasi mubhandi repasi kunochinja-chinja zvichienderana nekukwira nekudonha kunodiwa ne index. (b) , (d), (f) na (H) ndiwo macircuit anoenderana emafirita aya epasi yakaderera zvakateerana.
Mafirita eHigh pass, band-pass uye band stop anowanzo torwa kubva kumafirita elow-pass kuburikidza nekushandura frequency.
Sefa yeparamita inoshanda yakagadzirwa nenzira yekugadzira nemazvo zvichienderana nezvinodiwa nezviratidzo zvehunyanzvi, uye inogona kuwana sekitori yefirita ine mashandiro akanaka uye inochengetedza mari,
Sefa yeLC iri nyore kugadzira, inodhura zvishoma, yakafara mubhendi rema frequency, uye inoshandiswa zvakanyanya mukutaurirana, kugadzira zvishandiso nedzimwe nzvimbo; Panguva imwe chete, inowanzoshandiswa semhando yedhizaini yemamwe marudzi mazhinji ema filters.

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