Mukuita kwekudzidza kwepamusoro-kumhanya PCB dhizaini, crosstalk ipfungwa yakakosha inoda kuve nyanzvi. Iyo ndiyo nzira huru yekuparadzira kwe electromagnetic interference. Asynchronous siginecha mitsara, mitsara yekudzora, uye IO ports inofambiswa. Crosstalk inogona kukonzera mabasa asina kujairika emaseketi kana zvikamu.
Crosstalk
Inoreva kukanganiswa kusingadiwe vhoti yeruzha rwemitsetse yekufambisa iri padyo nekuda kwemagetsi ekubatanidza kana chiratidzo chinopararira patambo yekutapurirana. Kuvhiringidza uku kunokonzerwa nekutangisana uye mutual capacitance pakati pemitsara yekutumira. Iwo maparamendi ePCB layer, siginecha mutsara wepakati, hunhu hwemagetsi ekupedzisira kwekutyaira uye yekupedzisira yekugamuchira, uye nzira yekumisa mutsara zvese zvine chimwe chinokanganisa pane crosstalk.
Matanho makuru ekukunda crosstalk ndeaya:
Wedzera nzvimbo yeparallel wiring uye tevera mutemo we3W;
Isa tambo yekuzviparadzanisa pakati pewaya dzakafanana;
Deredza chinhambwe pakati peiyo wiring layer uye ndege yepasi.
Kuti uderedze crosstalk pakati pemitsetse, mutsara wemitsara unofanirwa kunge wakakura zvakakwana. Apo mutsara wepakati pepakati hausi pasi pe3 nguva yehupamhi hwemutsara, 70% yemunda wemagetsi inogona kuchengetwa pasina kupindirana, iyo inonzi mutemo we3W. Kana iwe uchida kuwana 98% yemunda wemagetsi pasina kupindirana, unogona kushandisa 10W spacing.
Ongorora: Mukugadzira PCB chaiyo, mutemo we3W haugone kuzadzisa zvizere zvinodikanwa zvekunzvenga crosstalk.
Nzira dzekudzivirira crosstalk muPCB
Kuti udzivise crosstalk muPCB, mainjiniya anogona kufunga kubva kune zvikamu zvePCB dhizaini uye dhizaini, senge:
1. Rongedza logic mudziyo wakateedzana zvinoenderana nebasa uye chengeta chimiro chebhazi chiri pasi pehutongi hwakasimba.
2. Deredza kureba kwemuviri pakati pezvikamu.
3. High-speed signal mitsara uye zvikamu (zvakadai se crystal oscillators) zvinofanira kunge zviri kure neI / () interconnection interface uye dzimwe nzvimbo dzinokonzerwa nekukanganiswa kwedata uye kubatanidza.
4. Ipa kugumisa kwakarurama kwemutsara wepamusoro-soro.
5. Dzivisa kureba kureba kwakafanana kune imwe neimwe uye kupa nzvimbo yakakwana pakati pematanho kuderedza inductive coupling.
6. Wiring pazvikamu zvakatarisana (microstrip kana stripline) inofanira kuva perpendicular kune imwe neimwe kudzivirira capacitive coupling pakati pezvikamu.
7. Deredza chinhambwe pakati pechiratidzo nendege yepasi.
8. Segmentation uye kuparadzaniswa kwepamusoro-noise emission sources (clock, I / O, high-speed interconnection), uye zviratidzo zvakasiyana zvinogoverwa muzvikamu zvakasiyana.
9. Wedzera chinhambwe pakati pemitsara yechiratidzo zvakanyanya sezvinobvira, izvo zvinogona kunyatso kuderedza capacitive crosstalk.
10. Deredza kutungamirira inductance, dzivisa kushandisa mitoro yakanyanyisa yekudzivirira uye yakaderera mitoro yekudzivirira mukati medunhu, uye edza kudzikamisa kukanganiswa kwemutoro weanalog circuit pakati pe loQ uye lokQ. Nekuti iyo yakakwira impedance mutoro uchawedzera iyo capacitive crosstalk, kana uchishandisa yakakwira impedance mutoro, nekuda kweiyo yakakwirira yekushanda voltage, iyo capacitive crosstalk ichawedzera, uye kana uchishandisa yakaderera impedance mutoro, nekuda kweiyo hombe yekushanda ikozvino, iyo inductive Crosstalk ichaita. kuwedzera.
11. Rongedza high-speed periodic signal pachikamu chemukati chePCB.
12. Shandisa impedance yekufananidza tekinoroji kuti uve nechokwadi chekutendeseka kweiyo BT chitupa chiratidzo uye kudzivirira overshoot.
13. Ziva kuti kune zvikwangwani zvine micheto inosimuka nekukurumidza (tr≤3ns), ita anti-crosstalk processing senge yekuputira pasi, uye ronga mimwe mitsetse yechiratidzo inokanganiswa neEFT1B kana ESD uye isina kusefa pamucheto wePCB. .
14. Shandisa ndege yepasi zvakanyanya sezvinobvira. Mutsara wechiratidzo unoshandisa ndege yepasi uchawana 15-20dB attenuation kana ichienzaniswa nemutsara wechiratidzo usingashandisi ndege yepasi.
15. Chiratidzo chepamusoro-frequency zviratidzo uye zviratidzo zvinonzwisisika zvinogadziriswa nevhu, uye kushandiswa kwe teknolojia yepasi mumapaneli maviri achawana 10-15dB attenuation.
16. Shandisa waya dzakadzikama, waya dzakadzivirirwa kana coaxial waya.
17. Sefa mitsetse yezviratidzo zvekushungurudza uye mitsetse inonzwisisika.
18. Isa mitsara uye wiring zvine musoro, isa wiring layer uye wiring spacing zvine musoro, kuderedza kureba kwezviratidzo zvakafanana, kupfupisa chinhambwe pakati pechiratidzo chechiratidzo uye nhandare yendege, kuwedzera nzvimbo yemitsara yechiratidzo, uye kuderedza kureba kwekufanana. mitsetse yechiratidzo (mukati mehurefu hwakakosha) , Aya matanho anogona kunyatso kudzikisa crosstalk.