Xov xwm

Cov lim dej tsis siv neeg, tseem hu ua LC lim, yog lub voj voog lim uas muaj inductance, capacitance thiab resistance, uas tuaj yeem lim tawm ib lossis ntau harmonics. Qhov feem ntau thiab yooj yim siv passive filter qauv yog txuas inductance thiab capacitance hauv series, uas tuaj yeem tsim ib qho impedance bypass qis rau cov harmonics tseem ceeb (3, 5 thiab 7); Ib qho tuned lim, ob chav tuned lim thiab siab dhau lim yog txhua yam passive lim.
qhov zoo dua
Cov lim dej passive muaj qhov zoo ntawm cov qauv yooj yim, tus nqi qis, kev ntseeg siab rau kev ua haujlwm thiab tus nqi qis. Nws tseem siv dav ua txoj kev tswj hwm harmonic.
kev faib tawm
Cov yam ntxwv ntawm LC lim yuav tsum ua tau raws li cov kev cai tshwj xeeb. Cov kev cai no feem ntau yog kev ua haujlwm attenuation hauv qhov zaus, lossis hloov theem, lossis ob qho tib si; Qee zaum, cov kev cai teb sijhawm hauv lub sijhawm tau pom zoo. Cov lim dej passive tuaj yeem muab faib ua ob pawg: cov lim dej tuned thiab cov lim dej siab dhau. Tib lub sijhawm, raws li cov txheej txheem tsim sib txawv, nws tuaj yeem muab faib ua cov lim duab parameter thiab cov lim dej ua haujlwm parameter.
Kev kho cov lim dej
Lub lim dej tuning muaj ib lub lim dej tuning thiab ob lub lim dej tuning, uas tuaj yeem lim tawm ib (ib qho tuning) lossis ob (ob chav tuning) harmonics. Lub zaus ntawm cov harmonics hu ua resonant frequency ntawm lub lim dej tuning.
Lim dej siab dhau
Cov lim dej siab dhau, tseem hu ua cov lim txo qhov loj, feem ntau suav nrog thawj qib siab dhau lim, qib thib ob qib siab dhau lim, qib thib peb qib siab dhau lim thiab C-hom lim, uas yog siv los ua kom cov harmonics qis dua qee zaus, uas yog hu ua qhov txiav zaus ntawm cov lim siab dhau.
Cov duab parameter lim
Lub lim dej no yog tsim thiab siv raws li txoj kev xav ntawm cov duab parameters. Lub lim dej no yog tsim los ntawm ntau ntu yooj yim (lossis ib nrab ntu) cascaded raws li lub hauv paus ntsiab lus ntawm kev sib npaug ntawm cov duab impedance ntawm qhov kev sib txuas. Ntu yooj yim tuaj yeem muab faib ua hom K-hom ruaj khov thiab hom m-derived raws li cov qauv ntawm lub voj voog. Siv LC low-pass lim dej ua piv txwv, qhov stopband attenuation ntawm qhov ruaj khov K-hom qis-pass seem yooj yim nce monotonically nrog kev nce ntawm zaus; Lub m-derived low-pass node muaj lub ncov attenuation ntawm qee zaus hauv stopband, thiab qhov chaw ntawm lub ncov attenuation yog tswj los ntawm tus nqi m hauv m-derived node. Rau lub lim dej qis-pass uas muaj cov ntu Cascaded Low-Pass yooj yim, qhov attenuation inherent yog sib npaug rau qhov sib npaug ntawm qhov attenuation inherent ntawm txhua ntu yooj yim. Thaum lub impedance sab hauv thiab load impedance ntawm lub zog fais fab xaus ntawm ob qho kawg ntawm lub lim dej yog sib npaug rau cov duab impedance ntawm ob qho kawg, qhov ua haujlwm attenuation thiab theem hloov ntawm lub lim dej yog sib npaug rau lawv qhov attenuation inherent thiab theem hloov raws li. (a) Lub lim dej uas pom yog tsim los ntawm ib ntu K ruaj khov thiab ob ntu m uas tau muab los ntawm cascade. Z π thiab Z π m yog cov duab impedance. (b) Puas yog nws qhov zaus attenuation. Qhov chaw ntawm ob lub ncov attenuation /f ∞ 1 thiab f ∞ 2 hauv qhov stopband yog txiav txim siab los ntawm cov nqi m ntawm ob lub m uas tau muab los ntawm.
Ib yam li ntawd, cov lim dej siab dhau, band-pass thiab band stop kuj tseem tuaj yeem tsim los ntawm cov ntu yooj yim sib xws.
Lub impedance ntawm cov duab ntawm lub lim dej tsis tuaj yeem sib npaug rau qhov tsis kam tiv thaiv sab hauv ntawm lub zog fais fab thiab lub zog impedance hauv tag nrho cov zaus band (qhov sib txawv loj dua hauv stopband), thiab qhov attenuation thiab kev ua haujlwm attenuation sib txawv heev hauv passband. Txhawm rau kom ntseeg tau tias muaj kev paub txog cov cim qhia kev siv tshuab, feem ntau nws yog qhov tsim nyog los khaws cia qhov txaus attenuation margin thiab nce qhov dav passband hauv kev tsim.
Kev ua haujlwm parameter lim
Cov lim dej no tsis yog tsim los ntawm cov ntu yooj yim cascaded, tab sis siv cov haujlwm network uas tuaj yeem ua tiav los ntawm R, l, C thiab cov ntsiab lus sib koom ua ke kom raug kwv yees cov lus qhia txog kev siv tshuab ntawm cov lim dej, thiab tom qab ntawd paub txog lub voj voog lim dej sib xws los ntawm cov haujlwm network tau txais. Raws li cov qauv kwv yees sib txawv, cov haujlwm network sib txawv tuaj yeem tau txais, thiab ntau hom lim dej tuaj yeem ua tiav. (a) Nws yog tus yam ntxwv ntawm cov lim dej qis-pass uas tau pom los ntawm qhov kev kwv yees qhov siab tshaj plaws (bertowitz approximation); Lub passband yog qhov tiaj tus tshaj plaws ze li xoom zaus, thiab qhov attenuation nce monotonically thaum nws mus txog qhov nres. (c) Yog tus yam ntxwv ntawm cov lim dej qis-pass uas tau pom los ntawm kev kwv yees sib npaug ripple (Chebyshev approximation); Qhov attenuation hauv passband hloov pauv ntawm xoom thiab qhov txwv sab saud, thiab nce monotonically hauv qhov nres. (e) Nws siv elliptic function approximation kom paub txog cov yam ntxwv ntawm cov lim dej qis-pass, thiab qhov attenuation nthuav tawm qhov hloov pauv voltage tas li hauv ob qho tib si pass band thiab nres band. (g) Yog tus yam ntxwv ntawm cov lim dej qis-pass uas tau pom los ntawm; Qhov attenuation hauv passband fluctuates hauv qhov sib npaug zos, thiab qhov attenuation hauv stopband fluctuates raws li qhov nce thiab poob uas xav tau los ntawm cov ntsuas. (b), (d), (f) thiab (H) yog cov circuits sib xws ntawm cov lim dej qis-pass no.
Cov lim dej siab dhau, band-pass thiab band stop feem ntau yog los ntawm cov lim dej qis dhau los ntawm kev hloov pauv zaus.
Lub lim dej ua haujlwm parameter yog tsim los ntawm txoj kev sib xyaw ua ke raws li qhov yuav tsum tau ua ntawm cov ntsuas kev ua haujlwm, thiab tuaj yeem tau txais lub voj voog lim dej nrog kev ua tau zoo heev thiab kev lag luam,
LC lim dej yooj yim ua, tus nqi qis, dav hauv cov zaus band, thiab siv dav hauv kev sib txuas lus, cov cuab yeej thiab lwm yam teb; Tib lub sijhawm, nws feem ntau siv ua tus qauv tsim ntawm ntau lwm hom lim dej.

Peb kuj tseem tuaj yeem kho cov khoom siv rf passive raws li koj xav tau. Koj tuaj yeem nkag mus rau nplooj ntawv kho kom raug kom muab cov lus qhia koj xav tau.
https://www.keenlion.com/customization/

Email:
sales@keenlion.com
tom@keenlion.com