Circuit Court lub sijhawm yog ib qho khoom tseem ceeb uas yuav tsum muaj los ntawm cov khoom siv hluav taws xob, nrog rau cov khoom siv kho mob, thiab cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob Thaum tsim cov crystal - tswj cov sij hawm thiab cov qauv tsim nyog uas yuav tsum muaj thaum ncaj qha rau lub quartzrystal nrog oscillator IC.
Muaj ntau rau ntau yam los txiav txim siab, suav nrog Crystal Lighty, resonance hom, tsav lub zog, thiab oscillator tsis zoo. Nyob rau hauv cov nqe lus ntawm Circuit Coutout, cov neeg tsim qauv yuav tsum muaj tus account rau PCB Parasitic capacitance, thiab muaj kev sib xyaw ntawm- chip capacitors. Tus qauv tsim kawg yuav tsum yog kev cog lus thiab ntseeg tau, nrog ob peb lub hauv paus me me, thiab siv tsawg kawg nkaus thoob plaws ib qho kev siv hluav taws xob dav dav.
Ib qho yooj yim ntim crystal oscillator (SPXO) yog ib qho kev daws teeb meem. Cov no txuas ntxiv voltage oscillators tau zoo rau kev siv hluav taws xob tsawg thiab muaj peev xwm ua haujlwm rau cov kev daws teeb meem uas tuaj yeem sib xyaw nrog kev tsim nyog tsawg.
Kab lus no yuav tham me ntsis txog qee qhov kev xav tau tseem ceeb tshaj plaws uas yuav tsum tau ua tiav thaum tsim qauv teeb tsa thaum muaj kev txiav txim siab Quartz muaju thiab lub sijhawm ICSE. Nws mam li qhia tau cov neeg tawm tsam tau hais txog cov neeg tsim qauv tau siv tau cov cuab yeej siv hluav taws xob.
Crystal oscillator ua haujlwm thiab kev sib tw sib tw
Kev noj fais fab yog ib qho tseem ceeb xav rau cov roj teeb me - powered wireless wireless wireless khoom siv. Muaj ntau cov khoom siv xws li yog ua raws ultra- Qhov hluav taws xob (soc)}} Ib qho ntxiv, txij li lub roj teeb feem ntau yog kim tshaj plaws hauv lub system, txo qis nws qhov loj me yog qhov tseem ceeb rau kev tswj cov khoom siv ntaus ntawv. Uas tau hais tias, Cov khoom muag tau tam sim no feem ntau yog qhov roj teeb tseem ceeb tshaj plaws hauv lub cev me me, thiab cov standby tam sim no feem ntau yeej los ntawm moos oscillator. Yog li ntawd, nws yog qhov tseem ceeb los txo qhov kev siv tam sim no ntawm oscillator.
Hmoov tsis zoo, tsim tus qes - fais oscillator tuaj yeem yog qhov nyuaj. Ib txoj kev ntawm txuag lub zog yog kom txo qis muag tam sim no los ntawm kev nkag mus rau "xiam oob qhab" thiab pib lub oscillator thaum xav tau. Txawm li cas los xij, xav tau ib lub crystal oscillator yuav pib sai thiab ntseeg tau yog tsis muaj ib txoj haujlwm yooj yim. Cov neeg tsim qauv yuav tsum ua kom ntseeg tau tias cov oscillator tseem nyob rau hauv qhov qis- lub xeev tam sim no thaum lub sijhawm pib qhib thiab ib puag ncig.
Lub hno oscillator configuration feem ntau pom nyob rau hauv qis - fais fab wireless wireless tog (Daim duab 1). Lub Oscillator yog tsim siv lub crystal (x) thiab c2 thiab c2), nyob ib puag ncig los ntawm kev inverting amplecting nrog ib lub tswv yim sab hauv resistor. Nyob rau hauv cov xwm txheej haum kom haum, thaum lub ampififier cov zis yog pub rov qab rau cov tswv yim, qhov tsis zoo yog tsim tawm, ua rau oscillation.
Daim duab 1: Yooj yim Pierce Oscillator teeb tsa ib ncig ntawm Crystal (X) thiab LOAD Captors C1 thiab C2.
Cov qauv crystal yog qhov nyuaj; Qhov kev sib tham no tsuas yog npog cov txheej saum toj kawg nkaus thiab yooj yim ntawm cov muaju ua haujlwm hauv oscillators.
Kaw - lub voj ejop Cov nyiaj GM tuaj yeem siv los ua daim duab (FOM) los piav txog kev ntseeg tau ntawm tus neeg poob qis. Kaw - lub voj ejop nce npoo kuj tseem hu ua oscillation npoo (OA). OA tus nqi qis dua 5 tuaj yeem ua rau kev sib tw tsis tshua muaj ntau yam thiab kub -} muaj cov teeb meem pib. Tsim nrog OA tus nqi ntawm 20 lossis siab dua yog muaj zog thiab ruaj khov, ua haujlwm tsawg dua los ntawm cov crystal ntau lawm thiab SC kev coj ua yam ntxwv.
Txhawm rau ntsuas cov oscillator tus OA, tus nce resistor ra tuaj yeem ntxiv rau hauv Circuit Court (Daim Duab 2). Nce RA tus nqi kom txog thaum tus oscillator tsis pib. Nov yog txoj kev siv los txiav txim siab OA tus nqi, raws li qhia hauv qab no:
Txoj kab 1
Qhov twg:
Rn yog qhov tsis zoo
Re yog qhov sib npaug series tiv thaiv (ESR).
Txoj kab ib tsib
Txoj kab ib tsib
Qhov twg lub load Capritance cl yog xam raws li hauv qab no:
Txoj kab sib npaug 4
Qhov twg CS yog cov kuj muaj peev xwm sib txawv ntawm cov Circuities, nrog lub peev xwm capacitance muaj nuj nqis ntawm 3.0 thiab 5.0 pf.
Daim duab 2: Qhia txog cov qauv siv lead ua ntxiv (nruab nrab kem) thiab cov kho tau kho tau (RA) siv los ntsuas cov npoo oscillation.
OA nyob ntawm ESR (RE), thiab ESR nyob ntawm lub quartz lead ua rm thiab ntim capacitance cl. Rau qis -} fais fab oscillators, xws li cov siv nyob rau hauv qis- fais fab wireless wireless wireless wireless khoom siv, tus cawv ntawm RM thiab cl rau oa nce. Kev ntsuas OA yog lub sijhawm - kev noj haus thiab yuav txuas ntxiv txoj kev txhim kho txoj kev txhim kho. Yog li no, txoj haujlwm no yuav tsis saib xyuas, ua rau cov teeb meem kev ua tau zoo thaum lub kaw lus lossis khoom siv tau muab tso rau hauv kev tsim khoom.
Ib qho ntxiv, teeb tsa lub siab OA kom ntseeg tau tias kev ua haujlwm zoo oscillator ua haujlwm tuaj yeem ua rau lwm yam teeb meem. Piv txwv li, thaum muaj ntau dua eceCillator ncig lub vojrcuital kev ua tau, nws tuaj yeem saib xyuas lub zog hluav taws xob tshwm sim los ntawm cov siv lead ua. Xws li poob tuaj yeem yog ib qho tseem ceeb. Hais txog daim duab 2, lub Crystal cov lus tsa suab tsis kam RM ua rau lub zog tsis kam ua ntu zus los ntawm kev tiv taus. Thaum cl yog loj, nws nce ob qho tib si tam sim no thiab poob. Yog li ntawd, cov neeg tsim qauv yuav tsum tau sib npaug crystal lub zog poob nrog tus nqi o muaj tseeb.
Zam Txim Jitter
Thaum tsim qauv ua plaub quartzrystal oscillator, nws yog ib qho tseem ceeb kom nkag siab thiab txo jitter. Jitter muaj ob hom, ntsuas ntsuas los ntawm lub hauv paus txhais tau square (rms) tus nqi:
Lub Sij Hawm Jitter: Kuj tseem muaj cov ntsiab lus ntawm Jitter, qhov no yog hais txog lub sijhawm tshaj plaws ntawm ob peb lub sijhawm ntsuas oscillation, feem ntau tau ntsuas tsawg kawg 10 lub sij hawm.
Lub voj voog Jitter: Qhov no yog qhov hloov siab tshaj plaws hauv lub moos moos, ntsuas rau txhua lub voj voog es tsis ntau dua mus.
Cov cuab yeej ua ntej ntawm Jitter nyob rau hauv Quartz Crystal oscillator suav nrog zaus hluav taws xob, cov suab nrov tsis sib haum, thiab qee qhov kev teeb tsa sib tw. Nyob ntawm qhov chaw, cov qauv sib txawv tuaj yeem ua haujlwm kom txo Jitter.
Siv BornPass capacitors, nti inductors, lossis resistor - capacitor (RC) lim kom tswj lub zog hluav taws xob.
Hauv cov ntawv sau tseem ceeb uas yuav tsum tau muaj tsawg heev ntawm Jitter, tsim ib txoj kev los tswj kev ua kom zoo nkauj yog qhov tsis zoo ntawm cov ntawv no).
Txo lub zog cuam tshuam rov qab rau cov zis los ntawm kev txhim kho cov khoom thiab cov xwm txheej txiav.
Zam kev tsim qauv uas suav nrog theem - xauv cov looped, ntau yam, lossis cov program ua haujlwm, raws li lawv feem ntau nce Jitter.
Nruam Voltage Crystal Oscillator
Siv Aplacon cov Asadv, Asddv, thiab ASEDV SPXOS yog qhov zoo rau cov qauv tsim uas muaj qhov sib txawv ntawm 1.60 v (Daim Duab 3). Lub spxo series them tau sib txawv zaus; Asadv cov cuab yeej ua haujlwm ntawm zaus los ntawm kev ua haujlwm ntawm 1.25 MHz mus rau 100 MHz, thaum lub Asddv thiab Asedv pab kiag li los ntawm 1 MHz mus rau 160 MHz. Cov series ua raws nrog ROHS / ROHS II tus qauv thiab siv cov khoom sib khi ceramic {9} mount ntaus ntawv (SMD) ntim khoom (SMD). Tsis pub dhau lub operating kub ntau ntawm -40℃rau +85 degree, cov koob tiav tau zaus nyob ruaj khov ntawm ± 25 pm.
OA nyob ntawm ESR (RE), thiab ESR nyob ntawm lub quartz lead ua rm thiab ntim capacitance cl. Rau qis -} fais fab oscillators, xws li cov siv nyob rau hauv qis- fais fab wireless wireless wireless wireless khoom siv, tus cawv ntawm RM thiab cl rau oa nce. Kev ntsuas OA yog lub sijhawm - kev noj haus thiab yuav txuas ntxiv txoj kev txhim kho txoj kev txhim kho. Yog li no, txoj haujlwm no yuav tsis saib xyuas, ua rau cov teeb meem kev ua tau zoo thaum lub kaw lus lossis khoom siv tau muab tso rau hauv kev tsim khoom.
Ib qho ntxiv, teeb tsa lub siab OA kom ntseeg tau tias kev ua haujlwm zoo oscillator ua haujlwm tuaj yeem ua rau lwm yam teeb meem. Piv txwv li, thaum muaj ntau dua eceCillator ncig lub vojrcuital kev ua tau, nws tuaj yeem saib xyuas lub zog hluav taws xob tshwm sim los ntawm cov siv lead ua. Xws li poob tuaj yeem yog ib qho tseem ceeb. Hais txog daim duab 2, lub Crystal cov lus tsa suab tsis kam RM ua rau lub zog tsis kam ua ntu zus los ntawm kev tiv taus. Thaum cl yog loj, nws nce ob qho tib si tam sim no thiab poob. Yog li ntawd, cov neeg tsim qauv yuav tsum tau sib npaug crystal lub zog poob nrog tus nqi o muaj tseeb.
Zam Txim Jitter
Thaum tsim qauv ua plaub quartzrystal oscillator, nws yog ib qho tseem ceeb kom nkag siab thiab txo jitter. Jitter muaj ob hom, ntsuas ntsuas los ntawm lub hauv paus txhais tau square (rms) tus nqi:
Lub Sij Hawm Jitter: Kuj tseem muaj cov ntsiab lus ntawm Jitter, qhov no yog hais txog lub sijhawm tshaj plaws ntawm ob peb lub sijhawm ntsuas oscillation, feem ntau tau ntsuas tsawg kawg 10 lub sij hawm.
Lub voj voog Jitter: Qhov no yog qhov hloov siab tshaj plaws hauv lub moos moos, ntsuas rau txhua lub voj voog es tsis ntau dua mus.
Cov cuab yeej ua ntej ntawm Jitter nyob rau hauv Quartz Crystal oscillator suav nrog zaus hluav taws xob, cov suab nrov tsis sib haum, thiab qee qhov kev teeb tsa sib tw. Nyob ntawm qhov chaw, cov qauv sib txawv tuaj yeem ua haujlwm kom txo Jitter.
Siv BornPass capacitors, nti inductors, lossis resistor - capacitor (RC) lim kom tswj lub zog hluav taws xob.
Hauv cov ntawv sau tseem ceeb uas yuav tsum tau muaj tsawg heev ntawm Jitter, tsim ib txoj kev los tswj kev ua kom zoo nkauj yog qhov tsis zoo ntawm cov ntawv no).
Txo lub zog cuam tshuam rov qab rau cov zis los ntawm kev txhim kho cov khoom thiab cov xwm txheej txiav.
Zam kev tsim qauv uas suav nrog theem - xauv cov looped, ntau yam, lossis cov program ua haujlwm, raws li lawv feem ntau nce Jitter.
Lub ntsiab
Cov neeg tsim qauv yuav tsum muaj qhov raug thiab txhim khu kev qha oscillators los muab sij hawm ruaj khov nyob thoob plaws cov kev siv thiab kev ua haujlwm kub. Kev Txiav Txim Crystal - tswj cov yam ntxwv uas xav tau, tab sis nws yog lub sij hawm- kev noj haus thiab cov txiaj ntsig hauv cov nqi tsis tsim nyog. Ib qho ntxiv, lawv tsis yog kev xaiv zoo tshaj plaws hauv cov nqe lus ntawm daim ntawv.
Raws li muaj nyob hauv daim duab, cov tsim qauv tuaj yeem siv tsawg - fais fab sib xyaw rau spxos. Cov spxos no tau npaj txhij -- Siv cov ntsuas kub zoo thoob plaws ib qho kev ua haujlwm ntau heev. Los ntawm kev siv spxos, cov tsim qauv tuaj yeem txo tus naj npawb ntawm cov khoom, txo qhov kev daws teeb meem qis, txo qis kev sib dhos, thiab txhim kho kev ntseeg tau.