Cov ntsiab lus ntawm crystal oscillator
Crystal oscillator hais txog cov wafer txiav los ntawm quartz siv lead ua raws li ib qho azimuth Angle, quartz siv lead ua resonator, hu ua quartz siv lead ua lossis siv lead ua oscillator;Cov khoom siv lead ua nrog IC ntxiv rau hauv pob yog hu ua crystal oscillator.Nws cov khoom yog feem ntau ntim rau hauv cov rooj plaub hlau, tab sis kuj yog cov iav, ceramics lossis yas.
Lub hauv paus ntsiab lus ua haujlwm ntawm crystal oscillator
Quartz siv lead ua oscillator yog ib qho khoom siv resonant ua los ntawm piezoelectric nyhuv ntawm quartz siv lead ua.Nws cov ntsiab lus tseem ceeb yog kwv yees li hauv qab no: Los ntawm quartz siv lead ua raws li ib qho azimuth hlais, coated nrog cov nyiaj txheej ntawm nws ob qhov chaw sib xws li electrodes, welded ib cov hlau lead hlau ntawm txhua electrode txuas nrog tus pin, ua ke nrog lub plhaub plhaub tsim. quartz siv lead ua resonator, hu ua quartz siv lead ua los yog siv lead ua, siv lead ua vibration.Nws cov khoom yog feem ntau ntim rau hauv cov rooj plaub hlau, tab sis kuj yog cov iav, ceramics lossis yas.
Yog hais tias lub teb hluav taws xob siv rau ob lub electrodes ntawm quartz siv lead ua, lub nti deforms mechanically.Conversely, yog hais tias txhua yam siv lub siab ntawm ob sab ntawm lub nti, ib tug hluav taws xob teb yuav raug generated nyob rau hauv lub coj kev coj ntawm lub nti.Qhov tshwm sim ntawm lub cev no hu ua piezoelectric effect.Yog hais tias alternating voltages yog siv rau ob tug ncej ntawm lub nti, lub nti yuav tsim mechanical vibrations, uas nyob rau hauv lem yuav tsim alternating hluav taws xob teb.
Feem ntau, lub amplitude ntawm cov neeg kho tshuab kev co ntawm lub nti thiab lub amplitude ntawm lub alternating hluav taws xob teb yog heev me me, tab sis thaum lub zaus ntawm lub thov alternating voltage yog ib tug tshwj xeeb tus nqi, lub amplitude nce ho, ntau loj dua li ntawm lwm zaus. , qhov tshwm sim no hu ua piezoelectric resonance, uas zoo ib yam li lub resonance ntawm LC Circuit Court.Nws resonant zaus muaj feem xyuam rau kev txiav hom, geometry thiab qhov loj ntawm cov nti.
Thaum cov siv lead ua tsis vibrate, nws tuaj yeem suav hais tias yog lub tiaj tus capacitor hu ua electrostatic capacitance C, thiab nws qhov loj me yog cuam tshuam nrog qhov loj me ntawm cov nti thiab thaj tsam ntawm electrode, feem ntau hais txog ob peb txoj kev tawv nqaij mus rau kaum ob ntawm daim tawv nqaij txoj kev. .Thaum cov siv lead ua oscillates, lub inertia ntawm cov neeg kho tshuab kev co yog sib npaug rau inductance L. Feem ntau, L qhov tseem ceeb ntawm kaum mus rau pua pua degrees.Lub elasticity ntawm cov nti tuaj yeem sib npaug rau capacitance C, uas yog me me, feem ntau tsuas yog 0.0002 ~ 0.1 picograms.Qhov poob los ntawm kev sib txhuam thaum lub sij hawm wafer vibration yog sib npaug rau R, uas muaj ib tug nqi ntawm 100 ohms.Vim hais tias qhov sib npaug inductance ntawm lub nti yog loj heev, thiab C yog heev me me, R kuj me me, yog li qhov zoo tshaj plaws Q ntawm Circuit Court yog loj heev, mus txog 1000 ~ 10000. Tsis tas li ntawd, lub resonant zaus ntawm lub nti nws tus kheej. Nws yog ib qho tseem ceeb tsuas yog hais txog kev txiav hom, geometry thiab qhov loj ntawm cov nti, thiab tuaj yeem ua tiav, yog li lub oscillator Circuit Court muaj li ntawm quartz resonators tuaj yeem tau txais kev ruaj ntseg siab.
Cov khoos phis tawj muaj lub sijhawm teem sijhawm, thiab txawm hais tias lo lus " moos" feem ntau siv los xa mus rau cov khoom siv no, lawv tsis yog moos hauv qhov kev xav ib txwm muaj.Tej zaum lawv yuav zoo dua hu ua timers.Lub tshuab computer timer feem ntau yog cov khoom siv quartz siv lead ua uas ua haujlwm nyob rau hauv nws cov kev txwv nruj ntawm qhov zaus uas nyob ntawm seb cov siv lead ua nws tus kheej raug txiav thiab qhov nro npaum li cas.Muaj ob daim ntawv teev npe cuam tshuam nrog txhua lub quartz siv lead ua, lub txee thiab tuav npe.Txhua oscillation ntawm quartz siv lead ua txo cov txee los ntawm ib qho.Thaum lub txee txo qis rau 0, kev cuam tshuam raug tsim tawm thiab lub txee reloads tus nqi pib los ntawm kev tuav npe.Txoj hauv kev no ua rau nws muaj peev xwm ua tau lub sijhawm teem sijhawm los tsim 60 cuam tshuam ib ob (lossis ntawm lwm qhov xav tau ntau zaus).Txhua qhov kev cuam tshuam yog hu ua moos zuam.
Hauv cov ntsiab lus hluav taws xob, siv lead ua oscillator tuaj yeem sib npaug rau ob lub davhlau ya nyob twg ntawm lub capacitor thiab cov resistor nyob rau hauv parallel thiab capacitor hauv series.Nyob rau hauv hluav taws xob engineering, lub network no muaj ob lub ntsiab lus resonance, uas tau muab faib ua siab thiab qis zaus.Qhov tsawg zaus yog series resonance, thiab cov zaus ntau dua yog parallel resonance.Vim yog cov yam ntxwv ntawm cov siv lead ua nws tus kheej, qhov kev ncua deb ntawm ob lub frequencies yog heev ze.Nyob rau hauv qhov no nqaim ntau zaus, cov siv lead ua oscillator yog sib npaug rau ib qho inductor, tsuav yog tias ob qhov kawg ntawm cov siv lead ua oscillator txuas nrog rau qhov sib npaug nrog cov capacitors tsim nyog, nws yuav tsim ib qho hluav taws xob sib txuas.Qhov no parallel resonant Circuit Court tuaj yeem muab ntxiv rau qhov kev tawm tswv yim tsis zoo los tsim ib lub voj voog sinusoidal oscillation.Vim tias qhov ntau zaus ntawm cov siv lead ua oscillator sib npaug rau inductance yog nqaim heev, qhov zaus ntawm cov oscillator no yuav tsis hloov ntau txawm tias qhov tsis sib xws ntawm lwm cov khoom sib txawv heev.
Crystal oscillator muaj ib qho tseem ceeb parameter, uas yog lub load capacitance tus nqi, xaiv lub parallel capacitance sib npaug zos rau load capacitance tus nqi, yuav tau txais lub nominal resonance zaus ntawm siv lead ua oscillator.Kev co siv lead ua oscillation Circuit Court yog nyob rau ntawm qhov kawg ntawm ib qho inverting amplifier txuas nrog cov muaju muaj ob lub capacitance tau txais qhov kawg ntawm cov muaju, feem ntau ntawm txhua qhov capacitance ntawm qhov tau txais, lub peev xwm ntawm ob lub capacitors nyob rau hauv series tus nqi yuav tsum sib npaug. mus rau lub load capacitance, thov xyuam xim rau cov dav dav IC pins muaj qhov sib npaug input capacitance, qhov no tsis tuaj yeem tsis quav ntsej.Feem ntau, lub load capacitance ntawm crystal oscillator yog 15 lossis 12.5 daim tawv nqaij.Yog hais tias qhov sib npaug input capacitance ntawm cov khoom siv pins raug txiav txim siab, lub oscillation circuit ntawm crystal oscillator muaj li ntawm ob 22 daim tawv nqaij capacitors yog ib qho kev xaiv zoo dua.
Post lub sij hawm: Oct-20-2021