Crystal oscillators muab faib ua ob pawg: passive crystal oscillators thiab nquag siv lead ua oscillators. Raws li qhov sib txawv ntawm cov qauv sab hauv thiab txoj hauv kev ua haujlwm ntawm ob hom siv lead ua oscillators, cov siv lead ua oscillator raug hlawv tawm ntawm rooj plaub yuav tsum tau muab faib ua ob pawg.
Rau passive siv lead ua yog hlawv tawm hauv ob rooj plaub hauv qab no
1. Kev ua haujlwm tsis raug ntawm tes
Yog tias kev siv cov kub kub lossis lub sijhawm ntev los coj cov ko taw ntawm cov cua sov, yuav ua rau muaj kev puas tsuaj ntawm cov khoom siv hauv cov chips nyiaj plating txheej, kev tiv thaiv ntawm ultra tsis zoo thiab lwm yam teeb meem, ua rau cov siv lead ua tsis oscillate.
2. lub zog excitation loj heev
Raws li cov kev siv sib txawv, xaiv qhov tsim nyog excitation zog siv lead ua oscillator, tsis tsuas yog hloov cov zis zaus ntawm cov siv lead ua oscillator, arbitrarily hloov qhov loj ntawm lub zog excitation input rau lub crystal oscillator circuit. Vim hais tias lub zog excitation muab los ntawm lub Circuit Court loj heev yuav ua rau lub amplitude ntawm lub quartz nti ua loj, yog li ntau dhau tshav kub generated los ntawm quartz nti vibration cheeb tsam kub nce. Lub quartz wafer nws tus kheej generates gradient kub nce, uas ncaj qha destabilizes zaus. Lub tshuab deformation ntawm lub wafer yuav dhau qhov kev txwv elastic, ua rau hloov tsis tau ntawm cov lattice, uas ua rau muaj qhov sib txawv ntawm cov khoom siv lead ua ntau zaus. Hauv qhov xwm txheej hnyav dua, lub quartz wafer shatters, ua rau cov siv lead ua kom tsis txhob vibrating (stopping), lossis qhov peb hu ua "burnout". Ua rau qhov sib npaug tsis kam ua kom loj (Ceebtoom: cov khoom siv lead ua dav dav ntawm 10 ~ 100Ω), cuam tshuam rau cov siv lead ua oscillation, nyob rau hauv cov xwm txheej hnyav tshwm sim los ntawm cov siv lead ua vibration nres. Lub zog excitation ntau kuj tuaj yeem ua rau muaj kev puas tsuaj rau cov kua nplaum uas tuav lub wafer rau hauv paus, xws li tawg, nrog rau qhov ua rau lub hauv paus ntawm cov khoom siv lead ua tawg thiab siv lead ua kom nres.
Nyob rau hauv Circuit Court daim ntawv thov ntawm passive siv lead ua, qhov voltage ntxiv rau ob kawg ntawm cov siv lead ua yog tsawg heev, yog li ntawd lub passive siv lead ua hlawv tawm yog tsawg heev. Qhov kev huam yuaj tshwm sim ntau zaus hauv kev siv tsis raug ntawm cov khoom siv lead ua, yog li nws xav tau kev saib xyuas tshwj xeeb.
Rau cov nquag siv lead ua yog hlawv tawm ntawm rooj plaub kuj muab faib ua ob lub ntsiab lus hauv qab no
1. voltage input txuas mus rau qhov tsis ncaj ncees lawm kev taw qhia
Kev siv ib txwm siv ntawm quartz siv lead ua oscillator: ib ko taw dai, ob txhais taw hauv av, peb taw txuas nrog cov zis, plaub taw txuas nrog qhov hluav taws xob.
Kev sib txuas hluav taws xob kom raug: qhov hluav taws xob hluav taws xob yuav tsum tau txuas nrog qhov hluav taws xob input tus pin (VCC) ntawm cov siv lead ua oscillator. Yog hais tias tsis ncaj ncees lawm kev cob cog rua rau lub grounding pin, lub siv lead ua yuav tam sim no "hlawv".
2. cov input voltage tsis raug xaiv lawm
General input voltage: 1.8V, 2.8V, 3.3V, 5V. Yog tias 5V tau muab rau cov siv lead ua nquag nrog qhov ntsuas hluav taws xob ntawm 1.8V, nws yuav ua rau muaj kev pheej hmoo siab ntawm cov siv lead ua raug hlawv.
Kev ceeb toom tshwj xeeb rau cov siv lead ua active: lub active siv lead ua yuav tawg tsuas yog hais tias nws yog pub nrog overload high voltage hwj chim. Tsis txhob txuas qhov tsis ncaj ncees lawm input voltage lossis thim rov qab.
