The Definitive Guide kune High-Speed ​​PCB uye Dzimba Zvishandiso

High-speed PCBs uye zvivakwa zvedzimba zvinhu zvakakosha mumagetsi emazuva ano, zvichiita kuti kufambiswa kwemasaini emagetsi nekumhanya kwakanyanya uku uchinyatso kudzora kupisa. Zvishandiso izvi zvakanyatsogadzirwa kuti zvisangane nezvinodikanwa zve-high-frequency application, senge aerospace, dziviriro, nharembozha, uye michina yekurapa. Mugwaro rino rakazara, isu tichaongorora maitiro, zvakanakira, zvazvakaipira, uye mashandisiro eakasiyana-siyana ekumhanya-mhanya PCB uye zvinhu zvemba, zvichikubatsira kuita sarudzo dzine ruzivo kumapurojekiti ako.

Chii chinonzi High-Speed ​​PCBs?

High-speed Printed Circuit Boards (PCBs) mabhodhi edunhu akasarudzika akagadzirirwa kubata masaini akakwira-frequency ane kushomeka kwechiratidzo. Aya mabhodhi ndiwo akakosha mumagetsi emazuva ano, achigonesa kufambiswa kwedata nekumhanya kunodiwa kune zvikumbiro zvakaita senharembozha, network network, uye yakakwirira-performance computing.

High-speed PCBs inosiyana kubva kune echinyakare maPCB mukugadzira kwawo uye zvinhu kuti zvigadzirire izvo zvakasarudzika zvinodiwa zveakakwira-frequency masaini. Iwo akagadzirwa kuti aderedze kurasikirwa kwechiratidzo, impedance mismatch, uye electromagnetic interference (EMI), kuve nechokwadi chekufambisa data. Yepamusoro-kumhanya PCBs inowanzo ratidza inodzorwa impedance traces, chaiyo layer stackups, uye zvemhando yepamusoro zvinhu kuzadzisa izvi zvinodiwa.

Akakosha maficha epamusoro-kumhanya PCB anosanganisira:

1. Inodzorwa Impedance: High-speed PCBs inoshandisa inodzorwa impedance traces kuti ienderane neiyo impedance yemutsetse wekutapurirana, kuderedza zviratidzo zvechiratidzo uye kuve nechokwadi chekuvimbika kwechiratidzo.
2. Chiratidzo Kuvimbika: Kuchengeta chiratidzo chekuvimbika kwakakosha muPCB inomhanya-mhanya kudzivirira kukanganiswa kwechiratidzo, kukanganisa kwedata, uye kukanganiswa kwemagetsi.
3. Low Loss Materials: High-speed PCBs inowanzoshandisa yakaderera-kurasikirwa dielectric zvinhu kuderedza kuderedzwa kwechiratidzo pamhepo huru.
4. Kugadzika uye Kugovera Masimba: Kudzika kwakaringana uye kugovera kwemagetsi kwakakosha pakuderedza ruzha uye kuve nechokwadi chekugadzika kwekupa kwemagetsi mumagadzirirwo ekumhanya.
5. EMI Shielding: High-speed PCBs inogona kusanganisira nzira dzekudzivirira kuderedza kukanganiswa kwemagetsi, kuve nechokwadi chekushanda kwakavimbika munzvimbo dzine ruzha.

Kazhinji, maPCB anomhanya zvakanyanya akakosha kumapurogiramu anoda kutumira data nekukurumidza uye kwakavimbika, zvichiita kuti ave zvikamu zvakakosha mumaindasitiri akasiyana-siyana, anosanganisira kutaurirana, networking, uye komputa.

High-Speed ​​PCB Zvishandiso

High-speed PCB zvinhu zvakakosha pakuona kuvimbika uye kuita kweyepamusoro-frequency zvigadzirwa zvemagetsi. Izvi zvinhu zvakagadzirirwa kuderedza kurasikirwa kwechiratidzo, kudzora impedance, uye kubata kupisa kupisa, zvichiita kuti zvive zvakakosha kune maapplication anoda kukurumidza kutapurirana data. Zvimwe zvakajairika zvekumhanya-mhanya PCB zvinhu zvinosanganisira:

FR-4

FR-4 chinhu chinoshandiswa zvakanyanya mumaPCB nekuda kwesimba rayo repamusoro remuchina, yakanakisa dielectric zvivakwa, uye hunhu hunodzoreredza moto. Iyo inopa yakanaka kupisa kupisa uye oxidation kuramba, ichiita kuti ive yakakodzera kune inoda nharaunda senge aerospace nekudzivirira.

Dielectric Constant uye Dispersion: Ma laminates eFR-4 anowanzova nema dielectric constants anotangira pa3.8 kusvika 4.8. Dielectric constant inoshanda yekuisa masaini pakati pemasaini pabhodhi inoenderana nezvinhu zvakaita se trace uye plane plane.

Zvakanakira: FR-4 yakareruka, hainzwi ruzha, uye haikanganisike nehunyoro, zvichiita kuti ive yakakodzera kushandiswa mumaindasitiri akasiyana-siyana, kusanganisira kushandiswa kwemaindasitiri uye kuputira magetsi.

Zvakashata: Hunhu hwe FR-4 hwe dielectric hunogona kudzikira kana hukashandiswa nesimba rakawandisa, voltage, kana kupisa, zvichideredza kushandiswa kwayo mumasisitimu emagetsi ane simba guru.

Mashandisirwo: FR-4 inowanzoshandiswa mukushandiswa kwemaindasitiri, kuputira magetsi, uye zvinhu zvakasiyana-siyana zvakaita se screw terminal strips, transformers, uye busbars.

laminate yakakosha ine kurasikirwa kwakaderera 4350B

Laminate 4350B inozivikanwa nekuvimbika kwayo uye kushanda kwayo kwepamusoro-soro mukushandiswa kwemafrequency akakwira. Inopa simba rakanaka remakanika, CTE yakaderera, uye inoshanda zvinobudirira patembiricha inosvika 260°C uye mafrequency anosvika 4 GHz.

Dielectric Constant uye Dissipation Factor: laminate 4350B ine dielectric constant ine 3.48 +/- 0.05, yakakodzera macircuits ane frequency yakakwira, uye low dissipation factor yakakodzera mafrequency anosvika 40 GHz.

Zvakanakira: laminate ine 4350B inopa kuwedzera kwekupisa kushoma, kugona kwayo kuvandudza, kurasikirwa kwechiratidzo kushoma, uye kufambisa kwekupisa kwakanyanya, zvichiita kuti ive yakakodzera zvikamu zve high-frequency uye kupisa kunopera.

Mashandisirwo: laminate ine low-loss low-loss 4350B inowanzoshandiswa muma microwave neRF assemblies, high-frequency circuits, uye printed circuit components.

Isola IS620

Isola IS620 yakagadzirirwa kushandiswa kwepamusoro-soro kubva pa2 kusvika ku15 GHz, ichipa kurasikirwa kwakaderera kumativi ose uye mhinduro yakapfava. Iyo inosanganisa dhijitari dhizaini inoshanduka neyakajairwa FR-4 kugadzirisa maitiro.

Zvakanakira: Isola IS620 inopa simba rekugadzirisa magetsi zvakanyanya, simba rekubvisa magetsi rakaderera pama frequency akasiyana-siyana, kugona kudzivirira UV, uye inoenderana neRoHS, zvichiita kuti ive yakakodzera magadzirirwo ezvigadzirwa zvepamusoro.

Zvakashata: Kusasimba kwezvisungo zveIsola IS620 kunogona kukanganiswa nekupisa kunoboorwa, zvichikonzera kusapisa zvakanaka uye masaini anoora.

Mashandisirwo: Isola IS620 inoshandiswa mukushandiswa kwema millimeter-wave, space satellite transceivers, E-band point-to-point microwave links, medical scanners, maindasitiri ekushandisa, uye zvishandiso zvesainzi.

Zvishandiso Zvedzimba Zvinomhanya-mhanya

Zvishandiso zveHousing Zvinomhanya Zvikuru zvinoita basa rakakosha mukudzivirira nekutsigira maPCB anomhanya Zvikuru. Pano, tinokurukura zvinhu zvitatu zvakakosha zvinoshandiswa mukushandiswa kwekumhanya Zvikuru: Liquid Crystal Polymer (LCP), Polytetrafluoroethylene ( PTFE ), uye Liquid Silicone Rubber (LSR).

Liquid Crystal Polymer (LCP):

• Advantages: LCP inopa epamusoro mechanicha simba, tembiricha kuramba, uye murazvo kuramba. Inochengetedza zvimiro zvinowirirana muzvikamu zvese zvakasimba uye zvemvura, zvichiita kuti ive yakakodzera kuumbwa kwejekiseni.
• payakaipira: LCP inoumba mitsetse isina kusimba yeweld kana yakasimudzwa uye yakanyanya anisotropic, inokanganisa kugadzikana kwedimensional.
• Applications: LCP inoshandiswa muzvikamu zvemotokari, aerospace engineering, midziyo yekurapa, uye midziyo yechikafu.

Polytetrafluoroethylene (PTFE):

• Advantages: PTFE ine kukwesha kwakaderera, inert zvivakwa, kuzvichenesa zvikwanisiro, kugara kwenguva refu, uye haibatike uye inoshingirira mukuora.
• payakaipira: PTFE inodhura, yakaoma kugadzira-zhinji, inoshandura chimiro netembiricha kana kudzvanywa, uye inonetsa kupinza.
• Applications: PTFE inoshandiswa muinjiniya yemuchadenga, midziyo yekurapa, machira efenicha, zvigadzirwa zvemotokari, nezvimwe.

Liquid Silicone Rubber (LSR):

• Advantages: LSR ine yakanakisa makemikari inertness, kuramba kubhakitiriya, UV mwenje, ozone, uye mwaranzi, uye yakakwirira gasi permeability.
• payakaipira: LSR haidzokerikezve, inotora nguva kurapa, uye inoda kunyatso kudzora mamiriro ekugadzirisa.
• Applications: LSR inoshandiswa mumagetsi ekufambisa mhepo, IV yekunyora masisitimu, magasi emotokari, zvemagetsi, uye zvinhu zvevatengi.

Chimwe nechimwe chezvishandiso izvi chinopa zvikomborero zvakasiyana uye zvisingabatsiri, zvichiita kuti zvive zvakakodzera kune zvakasiyana-siyana zvekushandisa mumagetsi ekumhanya. Kunzwisisa zvivakwa zvavo uye mashandisiro anogona kubatsira mainjiniya kusarudza zvinhu zvakafanira kune zvavanoda chaizvo.

Kusarudza Mashoko Akarurama

Paunenge uchisarudza zvekushandisa zvePCB inomhanya zvakanyanya uye dzimba, akati wandei akakosha zvinhu zvinofanirwa kutariswa kuti ive nechokwadi chekuita kwakakwana uye kuvimbika. Zvinhu zvakadai seCoefficient of Thermal Expansion (CTE), Decomposition Temperature, Moisture Absorption, uye Mechanical Properties inoita basa rakakosha mukuita sarudzo. Zvakakosha kuenzanisa zvinhu zvakasiyana zvichienderana nezvinhu izvi kuita sarudzo ine ruzivo.

Kazhinji, kusarudza zvinhu zvakakodzera zvePCB dzinomhanya zvakanyanya uye dzimba dzinogadziriswa kwakakosha kuti uwane mhedzisiro inobudirira mumapurojekiti ako. Kunzwisisa hunhu, zvakanakira, zvakaipira, uye mashandisirwo echinhu chimwe nechimwe kwakakosha pakuita sarudzo dzakarongeka. Sarudza zvinhu zvinoenderana nezvaunoda kuti uve nechokwadi chekuti magadzirirwo ako emagetsi anomhanya zvakanyanya anoshanda zvakanaka uye akavimbika.

mhedziso

Kusarudza iyo yakakodzera yepamusoro-yekumhanya PCB uye yedzimba zvinhu zvakakosha pakuona kuvimbika uye kushanda kwemidziyo yemagetsi. Vagadziri vanofanirwa kunyatso tarisisa zvinhu zvakakosha uye zvimiro zvechinhu chimwe nechimwe kuita sarudzo dzine ruzivo dzinoenderana nezvinodiwa zvemashandisirwo avo chaiwo. Kusarudzwa kwakakodzera kunogona kukanganisa zvakanyanya kushanda kwese, hupenyu hurefu, uye kushanda kwezvigadzirwa zvemagetsi, zvichiita kuti ive danho rakakosha mukugadzira uye kugadzira.