Isu tinowanzo enzanisa crystal oscillator kumoyo wedhijitari yedhijitari, nekuti basa rese redhijitari redhijitari harina kuparadzaniswa nechiratidzo chewachi, uye crystal oscillator inodzora zvakananga iyo system yese. Kana iyo crystal oscillator isingashande, iyo yose system ichave yakaoma mitezo, saka crystal oscillator ndiyo inodiwa kuti dhijitari yedhijitari itange kushanda.
Iyo crystal oscillator, sezvatinowanzo taura, ndeye quartz crystal oscillator uye quartz crystal resonator. Iwo ese ari maviri akagadzirwa nepiezoelectric mhedzisiro yemakristasi equartz. Kuisa munda wemagetsi kune maviri maelectrode ekristaro yequartz kunokonzera mechanical deformation yekristaro, nepo kushandisa mechanical pressure kumativi ose kunokonzera kuti munda wemagetsi uitike mukristaro. Uye zvese izvi zviitiko zvinodzokororwa. Uchishandisa chivakwa ichi, mavheti anochinja anoiswa kumativi ese ekristaro uye wafer inodedera zvine mutsindo, pamwe nekugadzira minda yemagetsi. Rudzi urwu rwekuzunguza uye munda wemagetsi kazhinji idiki, asi pane imwe frequency, iyo amplitude inowedzerwa zvakanyanya, iri piezoelectric resonance, yakafanana neLC loop resonance yatinowanzo kuona.
Semwoyo wedunhu redhijitari, iyo crystal oscillator inoita sei basa mune zvigadzirwa zvakangwara? Imba yakangwara senge air conditioning, maketeni, chengetedzo, kutarisisa uye zvimwe zvigadzirwa, zvese zvinoda wireless transmission module, ivo kuburikidza neBluetooth, WIFI kana ZIGBEE protocol, module kubva kumagumo kuenda kune imwe magumo, kana zvakananga kuburikidza nenharembozha kutonga, uye iyo isina waya module ndiyo yakakosha chikamu, inokanganisa kugadzikana kwehurongwa hwese, saka sarudza sisitimu yekushandisa crystal oscillator. Inosarudza kubudirira kana kutadza kwemaseketi edhijitari.
Nekuda kwekukosha kwekristaro oscillator mudhijitari redunhu, isu tinofanirwa kungwarira pakushandisa nekugadzira:
1. Kune makristasi e quartz mu crystal oscillator, iyo iri nyore kukonzera quartz crystal kuputsika uye kukanganisa kana ichikanganiswa kana kudonhedzwa nekunze, uye ipapo crystal oscillator haigoni kudengenyeka. Nokudaro, kuiswa kwakavimbika kwekristini oscillator kunofanira kutariswa mukugadzirwa kwedunhu, uye nzvimbo yaro haifaniri kunge iri pedyo nechepamusoro peplate uye ganda remichina sezvinobvira.
2. Chenjerera kune tembiricha yewelding kana welding nemaoko kana muchina. Crystal vibration inonzwa tembiricha, welding tembiricha haifanirwe kunge yakanyanya kukwirira, uye nguva yekudziya inofanira kunge ipfupi sezvinobvira.
Inonzwisisika crystal oscillator dhizaini inogona kudzvanya system radiation kukanganiswa.
1. Tsanangudzo yedambudziko
Chigadzirwa kamera yemunda, iyo ine zvikamu zvishanu mukati: core control board, sensor board, kamera, SD memori kadhi uye bhatiri. Iyo goko igoko repurasitiki, uye bhodhi diki rine maviri chete maficha: DC5V ekunze simba interface uye USB interface yekufambisa data. Mushure mekuyedzwa kwemwaranzi, zvinoonekwa kuti pane inenge 33MHz harmonic ruzha radiation dambudziko.
Iwo ekutanga bvunzo data ndeaya anotevera:
2. Ongorora dambudziko
Ichi chigadzirwa chegoko repurasitiki shell, isiri-yekudzivirira zvinhu, iyo yese bvunzo chete tambo yemagetsi uye USB tambo kunze kwegoko, ndiyo yekukanganisa frequency point inovhenekerwa netambo yemagetsi uye USB tambo? Naizvozvo, matanho anotevera anotorwa kuti aedze:
(1) Wedzera magineti mhete chete patambo yemagetsi, mhinduro dzebvunzo: kuvandudzwa hakusi pachena;
(2) Ingo wedzera magineti mhete pa USB tambo, mhinduro dzebvunzo: kuvandudzwa kuchiri kusiri pachena;
(3) Wedzera magineti mhete kune ese USB tambo uye tambo yemagetsi, mhinduro dzebvunzo: kuvandudzwa kuri pachena, kuwanda kwese kwekukanganisa kwakadzikira.
Izvo zvinogona kuoneka kubva pamusoro apa kuti kupindira frequency mapoinzi anoburitswa kubva kune maviri mainterfaces, iro risiri iro dambudziko remagetsi interface kana USB interface, asi yemukati yekupindira frequency mapoinzi akasanganiswa kune maviri mainterfaces. Kudzivirira imwe chete interface hakugone kugadzirisa dambudziko.
Kuburikidza nechiyero chepedyo-munda, zvinowanikwa kuti 32.768KHz crystal oscillator kubva kumusimboti control board inogadzira yakasimba spatial radiation, inoita kuti tambo dzakatenderedza uye GND dzibatanidzwe 32.768KHz harmonic ruzha, iyo inobva yabatanidzwa uye inopenya kuburikidza neinterface USB tambo uye tambo yemagetsi. Matambudziko ecrystal oscillator anokonzerwa nematambudziko maviri anotevera:
(1) Iko kristaro vibration iri padyo zvakanyanya kumucheto kweplate, iri nyore kutungamira kune iyo crystal vibration radiation ruzha.
(2) Pane mutsara wechiratidzo pasi pekristaro oscillator, iyo iri nyore kutungamirira kune harmonic ruzha rwechiratidzo chekubatanidza crystal oscillator.
(3) Iyo sefa chinhu chinoiswa pasi pekristaro oscillator, uye iyo sefa capacitor uye inofananidzira kuramba haina kurongeka zvinoenderana nechiratidzo chechiratidzo, izvo zvinoita kuti kusefa kwesefa kuwedzere.
3, mhinduro
Maererano nekuongorora, zvinotevera zvinopikisa zvinowanikwa:
(1) Iyo yekusefa capacitance uye inofananidzira kuramba kwekristaro padyo neCPU chip inoiswa kure nekumucheto kwebhodhi;
(2) Yeuka kusaisa pasi munzvimbo yekristaro yekuisa uye nzvimbo yekufungidzira pazasi;
(3) Iyo yekusefa capacitance uye inofananidzira kuramba kwekristaro yakarongedzwa zvinoenderana nechiratidzo chekutungamira, uye inoiswa zvakachena uye compact padyo nekristaro;
(4) Kirasi inoiswa pedyo nechip, uye mutsetse pakati pezviviri ipfupi uye wakatwasuka sezvinobvira.
4. Mhedziso
Mazuvano akawanda masystem crystal oscillator wachi frequency yakakwira, kupindira harmonic simba rakasimba; Kupindira harmonics haingofambiswi chete kubva kune yekupinza uye yekubuda mitsetse, asi zvakare inopenya kubva munzvimbo. Kana marongerwo asina musoro, zviri nyore kukonzeresa dambudziko rakasimba remwaranzi, uye zvakaoma kugadzirisa nedzimwe nzira. Naizvozvo, zvakakosha kwazvo pakurongeka kwekristaro oscillator uye CLK chiratidzo mutsara muPCB board marongero.
Cherechedza paPCB dhizaini yekristaro oscillator
(1) Iyo coupling capacitor inofanirwa kunge iri padyo nepini yemagetsi eiyo crystal oscillator sezvinobvira. Nzvimbo yacho inofanira kuiswa yakarongeka: maererano nemagetsi ekufambisa inflow direction, iyo capacitor ine diki diki inofanira kuiswa yakarongeka kubva kune yakakura kusvika kune duku.
(2) Iyo goko rekristaro oscillator inofanirwa kuve yakadzika, iyo inogona kupenya iyo crystal oscillator kunze, uye inogonawo kudzivirira kupindira kwekunze kwezviratidzo pane crystal oscillator.
(3) Usaisa waya pasi pekristaro oscillator kuti uve nechokwadi chekuti uriri hwakafukidzwa zvachose. Panguva imwecheteyo, usaita waya mukati me 300mil ye crystal oscillator, kuitira kuti udzivise crystal oscillator kuti irege kukanganisa kushanda kweimwe wiring, zvishandiso uye zvidimbu.
(4) Mutsara wechiratidzo chewachi unofanirwa kuva mupfupi sezvinobvira, mutsara unofanirwa kuve wakafara, uye chiyero chinofanira kuwanikwa mukureba kwewachi uye kure nenzvimbo yekupisa.
(5) Iyo crystal oscillator haifaniri kuiswa pamucheto wePCB board, kunyanya mukugadzirwa kwebhodhi kadhi.
