Ukuze kuqinisekiswe ikhwalithi yokudluliselwa kwesignali, ukunciphisa ukuphazamiseka kwe-EMI, futhi kuphumelele isitifiketi sokuhlolwa kwe-impedance esifanele, PCB idizayini ebalulekile yokufanisa isignali iyadingeka. Lo mhlahlandlela wokuklama usekelwe kumingcele yokubala evamile, izici zesignali yomkhiqizo we-TV, izidingo ze-PCB Layout, ukubala kwesofthiwe ye-SI9000, ulwazi lwempendulo yomhlinzeki we-PCB nokunye, futhi ekugcineni ufike ekwakhiweni okunconyiwe. Ifanele izinqubo eziningi zamazinga enqubo yabahlinzeki be-PCB kanye nemiklamo yebhodi le-PCB enezidingo zokulawula i-impedance.

Eyodwa. Idizayini ye-impedance yephaneli ephindwe kabili

① Idizayini yaphansi: ububanzi bomugqa, isikhala esingu-7/5/7mil ububanzi bentambo yaphansi ≥20mil isignali nebanga lentambo yaphansi engu-6mil, njalo ngemigodi engu-400mil yaphansi; (2) Idizayini engavimbeli: ububanzi bomugqa, isikhala esingu-10/5/10mil ukupheya komehluko kanye nebanga eliphakathi kokupheya ≥20mil (izimo ezikhethekile azikwazi ukuba ngaphansi kuka-10mil) kunconywa ukuthi lonke iqembu lomugqa wesiginali ohlukile usebenzisa imvilophi isivikelo, isignali ehlukile kanye nebanga lomhlabathi elivikelayo ≥35mil (izimo ezikhethekile azikwazi ukuba ngaphansi kuka-20mil). 90 ohm umehluko we-impedance umklamo onconyiwe

Ububanzi bomugqa, isikhala 10/5/10mil Ububanzi bentambo yaphansi ≥20mil Ibanga lesignali nentambo yaphansi engu-6mil noma u-5mil, imbobo yaphansi njalo ngo-400mil; ②Ungafaki idizayini:

Ububanzi bomugqa nesikhala 16/5/16mil ibanga eliphakathi kwepheya yesiginali ehlukile ≥20mil kuyanconywa ukuthi imvilophu yaphansi isetshenziselwe lonke iqembu lezintambo zesignali ezihlukile. Ibanga phakathi kwesignali ehlukile kanye nekhebuli yaphansi evikelekile kufanele ibe ngu-≥35mil (noma ≥20mil ezimeni ezikhethekile). Amaphuzu ayinhloko: nikeza kuqala ukusetshenziswa komklamo omboziwe womhlabathi, umugqa omfushane kanye nendiza ephelele ingasetshenziswa ngaphandle kokuklama komhlabathi okumboziwe; Imingcele yokubala: I-Plate FR-4, ukujiya kwepuleti 1.6mm+/-10%, ipuleti le-dielectric engaguquki 4.4+/-0.2, ukujiya kwethusi 1.0 oz (1.4mil) ukujiya kawoyela we-solder 0.6±0.2mil, i-dielectric njalo 3.5+/-0.3.

I-Impedans design yezendlalelo ezimbili nezine

100 ohm umehluko ovimbelayo onconywayo wobubanzi bomugqa wokuklama nesikhala esingu-5/7/5mil ibanga eliphakathi kwamapheya ≥14mil(umbandela we-3W) inothi: kunconywa ukuthi isembozo esingaphansi sisetshenziselwe lonke iqembu lamakhebuli esignali ahlukene. Ibanga phakathi kwesignali ehlukile kanye nekhebuli yaphansi evikelayo kufanele okungenani ibe ngu-35mil (hhayi ngaphansi kuka-20mil ezimweni ezikhethekile). 90ohm umehluko ovimbelayo Okutuswayo ububanzi bomugqa wokuklama nesikhala 6/6/6mil Ibanga lokupheya elihlukile ≥12mil(umbandela we-3W) Amaphuzu ayinhloko: Esimeni sekhebuli ehambisanayo ende, kunconywa ukuthi ibanga phakathi kwezinhlangothi ezimbili zomugqa wokuhlukanisa we-USB goqa umhlabathi ngo-6mil ukuze unciphise ubungozi be-EMI (goqa phansi futhi ungasongi umhlabathi, ububanzi bomugqa kanye nezinga lebanga lomugqa liyahambisana). Imingcele yokubala: I-Fr-4, ukujiya kwepuleti 1.6mm+/-10%, ipuleti le-dielectric elingaguquki 4.4+/-0.2, ukujiya kweCopper okungu-1.0oz (1.4mil) ishidi elakhiwe kancane (PP) 2116(4.0-5.0mil), i-dielectric constant 4.3+/ -0.2 ukujiya kawoyela we-solder 0.6±0.2mil, I-Dielectric engaguquguquki engu-3.5+/-0.3 eyakhiwe elayiniwe: ungqimba lokuphrinta kwesikrini ungqimba lwe-solder ungqimba lwethusi ungqimba lwethusi oluphulukisiwe kancane olunamekwe ngefilimu ye-copper substrate ephulukisiwe ifilimu ungqimba lwethusi isendlalelo sokuphrinta sesikrini sokuphrinta

Ezintathu. Idizayini ye-impedance yebhodi lezingqimba eziyisithupha

Isakhiwo se-lamination esinezingqimba eziyisithupha sihlukile ngezikhathi ezahlukene. Lo mhlahlandlela uncoma kuphela ukuklanywa kwe-lamination evamile (bheka i-FIG. 2), futhi imiklamo elandelayo enconywayo isekelwe kudatha etholwe ngaphansi kwe-lamination ku-FIG. 2. Idizayini ye-impedance yongqimba lwangaphandle iyafana nebhodi elinezingqimba ezine. Ngenxa yokuthi ungqimba lwangaphakathi ngokuvamile lunezingqimba zendiza eziningi kunolwendlalelo olungaphezulu, indawo ezungezile ye-electromagnetic ihlukile kungqimba olungaphezulu. Okulandelayo yiziphakamiso zokulawulwa kwe-impedance kwesendlalelo sesithathu se-wiring (inkomba ye-laminated Figure 4). 90 ohm umehluko ovimbelayo Ububanzi bomugqa wokuklama Okunconyiwe, ibanga lomugqa 8/10/8mil Ibanga lokubhangqa Umehluko ≥20mil(umbandela we-3W); Imingcele yokubala: I-Fr-4, ukujiya kwepuleti 1.6mm+/-10%, ipuleti le-dielectric elingaguquki 4.4+/-0.2, ukujiya kweCopper okungu-1.0oz (1.4mil) ishidi elakhiwe kancane (PP) 2116(4.0-5.0mil), i-dielectric constant 4.3+/ -0.2 ukujiya kawoyela we-solder 0.6±0.2mil, I-Dielectric engaguquguquki engu-3.5+/-0.3 esakhiwe nge-laminated: ungqimba oluphezulu oluvimbe isikrini esiphezulu ungqimba lwethusi olunamekwe kancane olunamekwe ngethusi olunamekwe kancane olunamekwe ngethusi

Ezindaweni ezingaphezu kwezine noma eziyisithupha, sicela uzenzele ngokwakho ngokwemithetho efanele noma uthintane nezisebenzi ezifanele ukuze unqume ukwakheka kwe-lamination kanye nohlelo lwezintambo.

5. Uma kunezinye izidingo zokulawula i-impedance ngenxa yezimo ezikhethekile, sicela uzibale ngokwakho noma uxhumane nabasebenzi abafanelekile ukuze unqume uhlelo lokuklama.

Qaphela: ① Kunezimo eziningi ezithinta i-impedance. Uma i-PCB idinga ukulawulwa yi-impedance, izimfuneko zokulawulwa kwe-impedance kufanele zimakwe ngokucacile kudatha yokuklama ye-PCB noma ishidi lesampula; (2) I-impedance yokuhlukanisa engu-100 ohm isetshenziselwa ikakhulukazi amasiginali we-HDMI ne-LVDS, lapho i-HDMI idinga ukudlulisa isitifiketi esifanele siyisibopho; ③ 90 ohm umehluko umehluko isetshenziswa ikakhulukazi isignali USB; (4) I-Single-terminal 50 ohm impedance isetshenziswa kakhulu engxenyeni yesiginali ye-DDR. Njengoba izinhlayiya eziningi ze-DDR zisebenzisa ukulungiswa kwangaphakathi okuhambisana ne-impedance design, umklamo usekelwe ebhodini leDemo elinikezwe inkampani yesisombululo njengereferensi, futhi lo mhlahlandlela wokuklama awunconywa. ⑤, i-single-end 75-ohm impedance isetshenziswa kakhulu ukufaka nokukhipha ividiyo ye-analog. Kunokumelana okungu-75-ohm okuhambisana nokumelana komhlabathi ekwakhiweni kwesekethe, ngakho-ke akudingekile ukwenza ukwakheka okufanayo kwe-impedance ku-PCB Layout, kodwa kufanele kuqashelwe ukuthi ukumelana komhlabathi okungu-75-ohm emgqeni kufanele kubekwe eduze. kuphinikhodi yetheminali. I-PP esetshenziswa kakhulu.