Mabhodhi edunhu akadhindwa (PCBs) ndiwo musimboti wezvigadzirwa zvemagetsi zvemazuva ano. Kubva pamafoni emafoni kuenda kumidziyo yekurapa, mabhodhi ePCB anoita basa rakakosha mukubatanidza nekupa mashandiro kune akasiyana emagetsi zvikamu. Kuti ive nechokwadi chekuita kwakaringana, vagadziri vePCB vanofanirwa kufunga zvakati wandei, kusanganisira inodzorwa impedance. Mune ino blog positi, isu tichanyura mune iyo pfungwa yekudzora impedance mumabhodhi ePCB uye tinzwisise kukosha kwayo kwekuwana inoshanda uye yakavimbika dhizaini dhizaini.
Chii chinodzorwa impedance muPCB?
Impedance inogona kutsanangurwa sekupikisa kunosangana nekuchinjanisa ikozvino (AC) inoyerera kuburikidza nedunhu. Inodzorwa impedance inonyatso inoreva kune nemaune inopindirana impedance kukosha pane chaiyo trace kana tambo yekufambisa paPCB board.
Impedance control yakakosha kana uchigadzira masaini edhijitari akakwira-frequency nekuti inobatsira kuchengetedza chiratidzo chekuvimbika, kuderedza zviratidzo zvechiratidzo, uye kuderedza kukanganiswa kwemagetsi (EMI). Kana impedance ikasadzorwa, inogona kuparadza hunhu hwekutapurirana kwechiratidzo, zvichikonzera kukanganisa, nyaya dzenguva, uye kukanganisa kwese kwekuita.
Zvinhu zvinokanganisa controlled impedance:
Kuti uwane inodzorwa impedance yePCB board, zvinhu zvakati wandei zvinoda kutariswa. Zvinhu izvi zvinosanganisira:
1. Trace geometry: Hupamhi, ukobvu uye kupatsanurwa kwemitsara uye mitsetse yekutapurirana paPCB ine simba guru pakukosha kwe impedance. Zviyero zvinofanirwa kuverengerwa nenzira kwayo uchishandisa impedance Calculator kana kupihwa nemugadziri wePCB.
2. Dielectric zvinhu: Iyo dielectric zvinhu inoshandiswa muPCB inokanganisawo inodzorwa impedance. Zvishandiso zvakasiyana zvine dielectric constants dzakasiyana, izvo zvinokanganisa kukurumidza kupararira kwemasaini.
3. Kureba kwematanho ari pedyo: Kuswedera kwekutumira uye kugamuchira zvinyorwa kuchakonzera mutual capacitance uye mutual inductance, nokudaro kuchinja kukosha kwekudzivirira. Kuchengeta chinhambwe chakachengeteka pakati pematare kunobatsira kuchengetedza inodzorwa impedance.
4. Layer stacking: Kurongeka uye kutevedzana kwePCB layers kunoita basa rakakosha mukudzora kwe impedance. Consistency in layer stacking yakakosha pakudzivirira kusawirirana kwe impedance.
Kukosha kwekudzora impedance muPCB dhizaini:
1. Chiratidzo chekuvimbika: Kudzora impedance inovimbisa kuti masaini edhijitari anofambiswa zvinobudirira muPCB pasina kukanganisa. Kuchengeta impedance control inoderedza kutarisisa, kurasikirwa kwechiratidzo, uye crosstalk, nekudaro kuvandudza kutendeseka kwechiratidzo.
2. Deredza kupindira kwemagetsi (EMI): Sezvo zvigadzirwa zvemagetsi zvichiramba zvichiwedzera mukuoma uye masaini emagetsi akakwirira, EMI yava nyaya inokosha. Kudzora impedance kunobatsira kuderedza EMI nekudzikisira zviratidzo zvechiratidzo uye kuve nechokwadi chekudzika kwakaringana uye kudzivirira.
3. Kushanda kwakafanana: PCBs ine impedance inodzorwa inopa maitiro emagetsi anowirirana kunyange pasi pekuchinja kwemamiriro ekunze akadai sekushisa uye humidity. Uku kuenderana kunoshandura kuita kwakavimbika uye hupenyu hwakawedzerwa hwemidziyo yako yemagetsi.
4. Kugarisana: Kudzora impedance kunovimbisawo kuenderana nezvimwe zvikamu uye masisitimu. PCB mabhodhi ane impedance yekufananidza anogona nyore kubatana uye kutaurirana nemamwe madivayiri, achibvumira kubatanidzwa kusina musono.
Inodzorwa impedance chinhu chakakosha chePCB dhizaini, kunyanya kune yakakwira frequency uye inonzwisisika application. Nekuchengetedza inopindirana impedance hunhu, vagadziri vanogona kukwidziridza kutendeseka kwechiratidzo, kuderedza EMI, uye kuona kuenderana. Kunzwisisa zvinhu zvinokanganisa inodzorwa impedance, senge trace geometry, dielectric zvinhu, uye layer stackup, yakakosha kuti uwane inoshanda uye yakavimbika PCB dhizaini. Nekuisa pamberi pekutonga kwe impedance, vagadziri vanogona kuvhura iyo yakazara mukana wezvigadzirwa zvemagetsi uku vachiunza hukuru hwekuita uye hupenyu hurefu.
Nguva yekutumira: Sep-15-2023