PCB gadzira yakakwira-kumhanya analog yekupinza siginecha nzira

Iyo yakafara upamhi hwemutsara, iyo yakasimba iyo anti-kupindira kugona uye zviri nani chiratidzo chemhando (pesvedzero yeganda mhedzisiro). Asi panguva imwecheteyo, chinodiwa che50Ω hunhu impedance inofanira kuvimbiswa. Yakajairika FR4 bhodhi, iyo yepamusoro mutsara wakafara 6MIL impedance ndeye 50Ω. Zviripachena kuti izvi hazvigone kusangana nemhando yezviratidzo zvinodikanwa zveyepamusoro-kumhanya analog yekuisa, saka isu tinowanzo shandisa gollowing kunze GND02 uye rega itaure kune iyo ART03 layer. Nenzira iyi, chiratidzo chekusiyanisa chinogona kuverengerwa se12/10, uye mutsara mumwe chete unogona kuverengerwa se18MIL. (Cherechedza kuti upamhi hwemutsara hunodarika 18MIL uyezve kuwedzera hakuna zvazvinoreva)

PCB dhizaini yakakwira-yekumhanyisa analog yekupinza siginecha nzira uye mitemo

Iyo CLINE yakamisikidzwa mune yegirini mumufananidzo inoreva kune imwechete-mutsara uye mutsauko wepamusoro-kumhanya analog kupinza kweART03 layer. Paunenge uchiita izvi, mamwe maitiro anofanirwa kutariswa:

(1) Iyo yekufananidza chikamu che TOP layer inoda kurongedzerwa, sezvakaratidzwa mumufananidzo uri pamusoro. Zvinofanira kucherechedzwa kuti kureba kubva pasi mhangura kusvika kune analog input CLINE inoda kuva 3W, kureva kuti, AIRGAP kubva kumucheto wemhangura kusvika kuCLINE yakapetwa kaviri upamhi hwemutsara. Zvinoenderana nemamwe ma electromagnetic theoretical calculations uye simulations, iyo magineti uye yemagetsi munda wemitsara yechiratidzo paPCB inonyanya kugoverwa mukati meiyo 3W. (Kukanganisa kweruzha kubva kumasaini akatenderedza kushoma pane kana kuenzana ne1%).

(2) Iyo GND mhangura yeiyo yakanaka layer yenzvimbo yeanalogi inodawo kuparadzaniswa kubva kune yakapoteredzwa dhijitari nzvimbo, ndiko kuti, ese akaturikidzana ari ega.

(3) Pakuchera kunze kweGND02, tinowanzo bvisa nzvimbo yese iyi, saka mashandiro acho ari nyore uye hapana dambudziko. Asi tichifunga nezve izvo kana kuti kuita zvirinani, isu tinogona chete kuvharira iyo analog yekuisa wiring chikamu, hongu, yakafanana neiyo TOP layer, iyo 3W nzvimbo. Izvi zvinogona kuvimbisa mhando yechiratidzo uye flatness yebhodhi. Chigumisiro chekugadzirisa ndeichi:

PCB dhizaini yakakwira-yekumhanyisa analog yekupinza siginecha nzira uye mitemo

Nenzira iyi, nzira yekudzoka yeakakwira-speed analog yekuisa chiratidzo inogona kukurumidza kuyerera paGND02 layer. Ndiko kuti, iyo yakafananidzirwa pasi yekudzoka nzira inova pfupi.

(4) Zvisina kujairika rova ​​nhamba huru yeGND vias kutenderedza high-speed analogi chiratidzo kuti analogi chiratidzo kuyerera kudzoka nokukurumidza. Inogonawo kutora ruzha.

PCB dhizaini yakakwira-kumhanya analogi yekuisa chiratidzo chekufambisa mitemo

Mutemo wekutanga: High-speed PCB signal routing shielding mitemo Mupamusoro-speed PCB dhizaini, mafambisirwo emitsara yekiyi yepamusoro-inomhanya sewachi inoda kudzivirirwa. Kana pasina nhovo kana chikamu chayo chete, zvinokonzeresa EMI kuvuza. Zvinokurudzirwa kuti waya yakavharidzirwa ivhurwe negomba pa1 mil.

PCB dhizaini yakakwira-yekumhanyisa analog yekupinza siginecha nzira uye mitemo

Mutemo 2: High-speed signal routing yakavharwa-loop mitemo

Nekuda kwekuwedzera kwehuwandu hwemabhodhi ePCB, mainjiniya mazhinji ePCB LAYOUT anowanzoita chikanganiso munzira yekufambisa, kureva kuti, masiginecha anomhanya-mhanya senge masaini wachi, anoburitsa yakavharwa-loop mibairo kana uchifambisa akawanda-layer PCB. Nekuda kweiyo yakavharwa loop, loop antenna ichagadzirwa, iyo inozowedzera iyo radiated intensity yeEMI.

PCB dhizaini yakakwira-yekumhanyisa analog yekupinza siginecha nzira uye mitemo

Mutemo 3: High-speed signal routing yakavhurika loop mitemo

Mutemo wechipiri unotaura kuti iyo yakavharwa loop ye-high-speed signals inokonzeresa EMI mwaranzi, asi iyo yakavhurika loop inokonzeresa EMI mwaranzi.

High-speed signal network senge wachi chiratidzo, kana yakavhurika-loop mhedzisiro ikaitika kana multilayer PCB ikafambiswa, mutsara antenna inogadzirwa, iyo inowedzera iyo EMI radiation intensity.

PCB dhizaini yakakwira-yekumhanyisa analog yekupinza siginecha nzira uye mitemo

Mutemo wechina: Hunhu impedance kuenderera mutemo weiyo yakakwirira-kumhanya chiratidzo

Kune yakakwirira-kumhanya masaini, iyo hunhu impedance inofanirwa kuenderera kana ichichinja pakati pematanho, zvikasadaro inowedzera EMI radiation. Mune mamwe mazwi, hupamhi hwe wiring yehumwechete hunofanira kuenderera mberi, uye impedance ye wiring yezvikamu zvakasiyana inofanira kuenderera mberi.

PCB dhizaini yakakwira-yekumhanyisa analog yekupinza siginecha nzira uye mitemo

Mutemo wechishanu: Wiring nzira yemitemo ye-high-speed PCB dhizaini

Iyo wiring pakati pematanho maviri ari padhuze inofanirwa kutevedzera musimboti weiyo wiring, zvikasadaro zvinokonzeresa crosstalk pakati pemitsara uye kuwedzera EMI mwaranzi.

Muchidimbu, mitsara yewaya iri padyo inoteedzera yakachinjika uye yakatwasuka wiring nzira, uye vertical wiring inogona kudzvanya crosstalk pakati pemitsara.

PCB dhizaini yakakwira-yekumhanyisa analog yekupinza siginecha nzira uye mitemo

Mutemo wechitanhatu: Topological chimiro mitemo mune yakakwirira-kumhanya PCB dhizaini

Mune yakakwirira-yekumhanya PCB dhizaini, kutonga kweiyo hunhu impedance yedunhu bhodhi uye dhizaini yeiyo topological chimiro pasi peakawanda-mutoro mamiriro anoona zvakananga kubudirira kana kukundikana kwechigadzirwa.

Iyo nhamba inoratidza daisy cheni topology, iyo inowanzo batsira kana ichishandiswa mune mashoma Mhz. Inokurudzirwa kushandisa nyeredzi-yakaita symmetrical chimiro kumucheto kumashure mune yakakwirira-kumhanya PCB dhizaini.

PCB dhizaini yakakwira-yekumhanyisa analog yekupinza siginecha nzira uye mitemo

Mutemo wechinomwe: Resonance mutemo wekutsvaga kureba

Tarisa kana kureba kwemutsara wechiratidzo uye kuwanda kwechiratidzo kuumba resonance, ndiko kuti, kana kureba kwewaya kuri kuwanda kwechiratidzo chewavelength 1/4, waya inonzwika, uye resonance ichapenya mafungu emagetsi. uye kukonzera kukanganisa.