Passive lim, tseem hu ua LC lim, yog ib lub lim dej uas muaj inductance, capacitance thiab tsis kam, uas tuaj yeem lim tawm ib lossis ntau qhov sib haum xeeb. Qhov feem ntau thiab yooj yim siv cov qauv lim dej yog txuas cov inductance thiab capacitance nyob rau hauv series, uas tuaj yeem tsim ib qho impedance bypass rau lub ntsiab harmonics (3, 5 thiab 7); Ib leeg tuned lim, ob chav tuned lim thiab high pass lim yog tag nrho cov lim passive.
qhov zoo
Passive lim muaj qhov zoo ntawm cov qauv yooj yim, tus nqi qis, kev ua haujlwm siab thiab kev ua haujlwm qis. Nws tseem yog dav siv raws li ib tug harmonic tswj txoj kev.
kev faib tawm
Cov yam ntxwv ntawm LC lim yuav tsum ua kom tau raws li qhov kev xav tau ntawm kev ntsuas ntsuas. Cov kev cai no feem ntau yog ua hauj lwm attenuation nyob rau hauv zaus, los yog theem hloov, los yog ob qho tib si; Qee zaum, lub sijhawm teb yuav tsum tau ua hauv lub sijhawm sau npe tau thov. Cov ntxaij lim dej Passive tuaj yeem muab faib ua ob pawg: cov ntxaij lim dej tuned thiab cov ntxaij lim dej siab dhau. Nyob rau tib lub sijhawm, raws li kev tsim qauv sib txawv, nws tuaj yeem muab faib ua cov duab parameter lim thiab ua haujlwm lim lim.
Tuning lim
Cov lim tuning muaj xws li ib lub lim dej tuning thiab ob lub lim dej, uas tuaj yeem lim tawm ib qho (ib qho kev sib tw) lossis ob (ob chav tuning) kev sib haum xeeb. Qhov zaus ntawm cov harmonics yog hu ua resonant zaus ntawm cov lim tuning.
High pass lim
High pass lim, tseem hu ua amplitude txo cov lim dej, feem ntau suav nrog thawj qhov kev txiav txim siab dhau lim, thib ob-order high pass lim, thib peb-order high pass lim thiab C-hom lim, uas yog siv los txo qis kev sib haum xeeb qis dua li qee zaus, uas yog hu ua qhov kev txiav tawm ntawm qhov siab dhau lim.
Duab parameter lim
Lub lim yog tsim thiab siv raws li kev xav ntawm cov duab tsis. Cov lim dej no yog tsim los ntawm ob peb ntu (lossis ib nrab ntu) cascaded raws li lub hauv paus ntsiab lus ntawm kev sib npaug ntawm cov duab impedance ntawm kev sib txuas. Cov seem yooj yim tuaj yeem muab faib ua K-hom thiab m-derived hom raws li cov qauv hauv Circuit Court. Noj LC low-pass lim ua piv txwv, qhov nres nres attenuation ntawm qhov ruaj K-hom qis-pass theem pib nce monotonically nrog qhov nce ntawm zaus; Lub m-derived low-pass theem pib node muaj lub ncov attenuation ntawm ib qho zaus hauv qhov nres, thiab txoj hauj lwm ntawm lub ncov attenuation yog tswj los ntawm tus nqi m hauv m-derived node. Rau cov lim dej qis uas tsim los ntawm Cascaded Low-Pass cov ntu hauv paus, qhov kev txo qis hauv nruab nrab yog sib npaug rau qhov sib npaug ntawm qhov kev cuam tshuam ntawm txhua ntu. Thaum lub impedance nyob rau hauv thiab load impedance ntawm lub hwj chim mov txiav tawm ntawm ob kawg ntawm lub lim yog sib npaug zos rau cov duab impedance ntawm ob qho tag nrho, qhov ua hauj lwm attenuation thiab theem hloov ntawm lub lim yog sib npaug rau lawv inherent attenuation thiab theem hloov raws. (a) Cov lim pom yog tsim los ntawm K seem ruaj khov thiab ob ntu muab tau los hauv cov cascade. Z π thiab Z π m yog cov duab impedance. (b) Yog nws tus yam ntxwv attenuation zaus. Cov hauj lwm ntawm ob qhov attenuation peaks / f ∞ 1 thiab f ∞ 2 nyob rau hauv lub stopband raug txiav txim los ntawm m qhov tseem ceeb ntawm ob m derived nodes.
Ib yam li ntawd, high pass, band-pass thiab band nres lim kuj tuaj yeem tsim los ntawm cov ntu sib xws.
Cov duab impedance ntawm lub lim tsis tuaj yeem sib npaug rau cov ntshiab resistive sab hauv tsis kam ntawm lub hwj chim mov thiab load impedance nyob rau hauv tag nrho cov zaus band (qhov txawv yog ntau dua nyob rau hauv lub stopband), thiab inherent attenuation thiab ua hauj lwm attenuation yog heev txawv nyob rau hauv lub passband. Txhawm rau kom ntseeg tau tias kev ua tiav ntawm cov ntsuas kev ua haujlwm, feem ntau nws yog ib qho tsim nyog yuav tsum tau khaws cia kom muaj qhov txaus attenuation margin thiab nce lub passband dav hauv kev tsim.
Kev khiav hauj lwm parameter lim
Cov lim dej no tsis yog tsim los ntawm cov ntu yooj yim, tab sis siv cov haujlwm hauv lub network uas tuaj yeem paub lub cev los ntawm R, l, C thiab kev sib nrig sib inductance cov ntsiab lus kom raug kwv yees cov kev qhia tshwj xeeb ntawm cov lim dej, thiab tom qab ntawd paub txog cov lim dej sib thooj los ntawm cov haujlwm tau txais network. Raws li cov txheej txheem sib txawv, cov haujlwm sib txawv ntawm lub network tuaj yeem tau txais, thiab cov lim dej sib txawv tuaj yeem ua tiav. (a) Nws yog tus yam ntxwv ntawm cov lim qis dhau los ntawm qhov flattest amplitude approximation (bertowitz approximation); Lub passband yog qhov tiaj tus tshaj plaws nyob ze zero zaus, thiab qhov attenuation nce monotonically thaum nws mus txog qhov nres. (c) Yog tus yam ntxwv ntawm low-pass lim pom los ntawm kev sib npaug ripple approximation (Chebyshev approximation); Lub attenuation nyob rau hauv lub passband fluctuates ntawm xoom thiab lub sab sauv txwv, thiab nce monotonically nyob rau hauv lub stopband. (e) Nws siv elliptic muaj nuj nqi approximation kom paub cov yam ntxwv ntawm low-pass lim, thiab lub attenuation nthuav tawm qhov hloov pauv tsis tu ncua nyob rau hauv ob qho tib si hla band thiab nres band. (g) Puas yog tus yam ntxwv ntawm cov lim dej qis tau pom los ntawm; Lub attenuation nyob rau hauv lub passband fluctuates nyob rau hauv sib npaug amplitude, thiab lub attenuation nyob rau hauv lub stopband fluctuates raws li qhov nce thiab poob yuav tsum tau los ntawm lub Performance index. (b) , (d), (f) thiab (H) yog cov khoom siv hluav taws xob sib txuas ntawm cov ntxaij lim dej qis qis no feem.
High pass, band-pass thiab band nres cov ntxaij lim dej feem ntau yog muab los ntawm cov ntxaij lim dej qis dhau los ntawm kev hloov pauv zaus.
Lub lim dej ua haujlwm yog tsim los ntawm cov txheej txheem synthesis kom raug raws li qhov yuav tsum tau muaj ntawm cov kev ntsuas kev ntsuas, thiab tuaj yeem tau txais lub tshuab lim dej nrog kev ua haujlwm zoo thiab kev lag luam,
LC lim yog ib qho yooj yim ua, tsis tshua muaj nqi, dav hauv ntau zaus, thiab siv dav hauv kev sib txuas lus, ntsuas thiab lwm yam haujlwm; Nyob rau tib lub sijhawm, nws feem ntau siv los ua tus qauv tsim ntawm ntau lwm hom lim.
Peb kuj tuaj yeem kho cov rf passive Cheebtsam raws li koj xav tau. Koj tuaj yeem nkag mus rau nplooj ntawv customization los muab cov kev qhia tshwj xeeb uas koj xav tau.
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Post lub sij hawm: Jun-06-2022