Peb tsuas yog paub tias cov siv lead ua yog cov khoom siv zaus, thiab rau cov siv lead ua muaj sub - zaus siv lead ua thiab cov neeg siv lead ua overtone tej zaum yuav tsawg thiab nyob deb ntawm. Yog li dab tsi yog qhov siv lead ua zaus, dab tsi yog qhov siv lead ua overtone, thiab qhov sib txawv ntawm kev siv ob hauv Circuit Court yog dab tsi?
Crystal kev co zoo li lub caij nplooj ntoos hlav, qhov kev vibration zaus ntawm cov siv lead ua thiab quartz siv lead ua cheeb tsam, thickness, txiav orientation, thiab lwm yam.
Qhov ntev nws yog, qhov qeeb qeeb nws co, thicker nws yog, thiab softer nws yog, qhov qeeb qeeb nws co.
Txawm li cas los xij, luv luv, nyias dhau, nyuaj dhau tsis tuaj yeem co.
Crystal oscillator yog cov neeg kho tshuab kev co, nrog rau cov yam ntxwv ntawm txhua yam kev co: cov duab, geometry, loj, thiab lwm yam., txiav txim siab qhov zaus ntawm kev co.
Crystal oscillator feem ntau yog ua los ntawm cov khoom siv quartz lossis ceramic ntxiv rau kev sib xyaw ua ke ntawm cov khoom siv sab hauv, thiab qhov zaus ntawm cov siv lead ua oscillator nyob ntawm qhov tuab ntawm cov wafer cuam tshuam. Ua ntej ntawm tag nrho cov, nyob rau hauv cov nqe lus ntawm cov txheej txheem ntau lawm, qhov luaj li cas ntawm lub wafer thiab lub thickness ntawm lub wafer yog ze ze rau lub zaus ntawm lub crystal oscillator. Piv txwv li, 40MHz quartz siv lead ua yuav tsum muaj wafer tuab ntawm 41.75 microns, uas yog qhov ua tau zoo, tab sis 100MHz quartz siv lead ua yuav tsum muaj wafer tuab ntawm 16.7 microns.
Txawm hais tias lub thickness tuaj yeem ua tiav, qhov poob siab heev, thiab cov wafer yuav tawg thaum nws muab tso rau hauv maj mam tom qab cov khoom tiav lawm. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum siv peb zaug overtone, tsib zaug overtone, thiab xya zaus overtone thev naus laus zis kom ua tiav cov siv lead ua ntau zaus. Piv txwv li, rau ib tug siv lead ua siv lead ua zaus ntawm 20MHz, ib tug crystal ntawm 100MHz yuav muab tau tom qab tsib overtones. Feem ntau hais lus, nyob rau hauv cov nqe lus ntawm kev paub, hauv qab 40MHz yog lub hauv paus siv lead ua zaus, thaum siab tshaj 40MHz, nws yog lub overtone siv lead ua.
Yog li ntawd, nws yog ib qho yooj yim to taub yog vim li cas muaj ntau yam active siv lead ua zaus yog ib txwm suav hais tias yog siab zaus, thiab tus nqi kuj tseem kim, tus nqi ntawm cov active siv lead ua ntxiv rau cov nti sab hauv yog thinner, thiab ces muaj ib tug oscillation daim ntxiv rau nws tus kheej. .
Yog li, dab tsi yog qhov txawv ntawm kev siv cov siv lead ua zaus thiab overtone siv lead ua? Muaj qhov sib txawv ntawm kev siv ob, piv txwv li, lub hauv paus zaus siv lead ua, tsuas yog yuav tsum tau nkag mus rau qhov tsim nyog capacitance ua haujlwm: hauv MCU siv lead ua ntawm txhua sab ntawm ib khub ntawm av capacitor vim li cas. Lub overtone siv lead ua, ntawm qhov tod tes, yuav tsum tau siv cov inductors thiab capacitors ua ke txhawm rau txhawm rau vibrate lub overtone zaus, txwv tsis pub nws tsuas yog vibrate qhov zaus.
Overtone siv lead ua kev taw qhia: quartz siv lead ua yog tsim los ntawm quartz wafer, thiab ntau zaus ntawm quartz siv lead ua sib xws rau qhov loj, thickness ntawm quartz wafer tsis zoo ib yam, feem ntau, ntau zaus ntawm cov quartz siv lead ua, lub thinner quartz wafer. xav tau. Piv txwv li, 40MHz quartz siv lead ua yuav tsum muaj wafer tuab ntawm 41.75 microns, uas yog qhov ua tau zoo, tab sis 100MHz quartz siv lead ua yuav tsum muaj wafer tuab ntawm 16.7 microns. Txawm hais tias lub thickness tuaj yeem ua tiav, qhov poob siab heev thiab wafer yuav tawg tom qab me ntsis poob thaum cov khoom tiav lawm. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum siv peb zaug overtone, tsib zaug overtone, thiab xya zaus overtone thev naus laus zis kom ua tiav cov siv lead ua ntau zaus.
Piv txwv li, rau ib tug siv lead ua siv lead ua zaus ntawm 20MHz, ib tug crystal ntawm 100MHz yuav muab tau tom qab tsib overtones. Feem ntau hais lus, los ntawm kev paub dhau los, qis dua 40MHz yog qhov tseem ceeb ntawm cov siv lead ua zaus, thaum siab dua 40MHz yog cov siv lead ua overtone.
Kuj tseem muaj qee qhov sib txawv ntawm kev siv ob, piv txwv li, cov siv lead ua ntawm lub hauv paus zaus tsuas yog yuav tsum tau nkag mus rau qhov tsim nyog capacitance ua haujlwm, thaum lub overtone siv lead ua xav tau inductance thiab capacitance ua hauj lwm ua ke kom vibrate lub overtone zaus, txwv tsis pub. nws tsuas tuaj yeem vibrate lub hauv paus zaus.
