Dzidza nezve wachi paPCB

Cherechedza zvinotevera zvewachi pabhodhi:

1. Kurongeka

a, kristaro yewachi uye masekete ane hukama anofanirwa kurongeka munzvimbo yepakati yePCB uye kuve nekuumbwa kwakanaka, kwete pedyo neI/O interface. Iyo wachi yechizvarwa chedunhu haigone kuitwa kadhi remwanasikana kana fomu yebhodhi remwanasikana, inofanira kugadzirwa pane imwe wachi bhodhi kana bhodhi rekutakura.

Sezvinoratidzwa mumufananidzo unotevera, bhokisi rakasvibirira chikamu chechikamu chinotevera chakanaka kuti usafamba mutsara

b, zvigadziriso chete zvine chekuita newachi yedunhu muPCB wachi yedunhu nharaunda, dzivisa kuisa mamwe maseketi, uye usaisa mamwe mitsetse yechiratidzo padhuze kana pazasi pekristaro: Kushandisa ndege yepasi pasi pedunhu rinogadzira wachi kana kristaro, kana imwe. zviratidzo zvinodarika ndege, iyo inopesana nekushanda kwendege yemepu, kana chiratidzo ichipfuura nepakati pepasi, pachava nekadiki yepasi loop uye inokanganisa kuenderera kwendege yepasi, uye izvi zvishwe zvepasi zvichakonzera matambudziko pamatunhu akakwirira.

c. Kune makristasi ewachi uye maseketi ewachi, matanho ekudzivirira anogona kugamuchirwa pakugadzirisa nhovo;

d, kana chivharo chewachi chiri simbi, dhizaini yePCB inofanira kuiswa pasi pekristaro mhangura, uye ive nechokwadi chekuti chikamu ichi uye ndege yepasi yakazara ine yakanaka yemagetsi kubatana (kuburikidza nevhu rinoputika).

Zvakanakira paving pasi pewachi makristasi:

Dunhu riri mukati mekristaro oscillator rinogadzira RF ikozvino, uye kana kristaro yakavharirwa muimba yesimbi, iyo DC simba pini ndiko kuvimba kweiyo DC voltage referensi uye iyo RF yazvino loop referensi mukati mekristaro, ichiburitsa iyo yenguva pfupi inogadzirwa ne RF mwaranzi yeimba kuburikidza nendege yepasi. Muchidimbu, iyo simbi shell ndeye-inopera antenna, uye iyo iri pedyo yemufananidzo layer, pasi plane layer uye dzimwe nguva maviri kana anopfuura akaturikidzana anokwana kuradiation yekubatanidza kweRF ikozvino pasi. Iyo crystal floor yakanakawo pakupisa kupisa. Iyo wachi yekutenderera uye kristaro underlay ichapa ndege yemepu, iyo inogona kuderedza yakajairika modhi ikozvino inogadzirwa neinosanganisirwa kristaro uye wachi yedunhu, nekudaro ichidzikisa RF radiation. Iyo ndege yepasi zvakare inotora iyo yekusiyanisa modhi RF ikozvino. Iyi ndege inofanirwa kubatana kune yakazara pasi ndege nemapoinzi akawanda uye inoda akawanda kuburikidza-maburi, ayo anogona kupa yakaderera impedance. Kuti uwedzere mhedzisiro yeiyi ndege yepasi, wachi jenareta redunhu rinofanira kunge riri padyo neiyi ndege yepasi.

Smt-yakarongedzerwa makristasi achange aine RF simba remwaranzi kupfuura simbi-clad makristasi: Nekuti pamusoro akaiswa makristasi anonyanya kuve epurasitiki mapakeji, iyo RF iripo mukati mekristaro ichapenya munzvimbo uye yakabatanidzwa kune mamwe maturusi.

1. Govera wachi routing

Zviri nani kubatanidza iyo inokurumidza kusimuka kumucheto chiratidzo uye bhero siginecha ine radial topology pane kubatanidza network neyakajairwa mutyairi sosi, uye nzira yega yega inofanirwa kufambiswa nekumisa matanho zvinoenderana nehunhu hwayo impedance.

2, wachi yekufambisa mutsara zvinodiwa uye PCB layering

Clock routing musimboti: Ronga yakazara mufananidzo yendege layer munzvimbo yepedyo yewachi routing layer, kuderedza kureba kwemutsara uye ita impedance control.

Kusarongeka kwemuchinjika-waya wiring uye impedance mismatches inogona kukonzera:

1) Kushandiswa kwemakomba uye kusvetuka mu wiring kunotungamirira kune kutendeseka kwechifananidzo chemufananidzo;

2) Kuwedzera kwemagetsi pamhepo yemufananidzo nekuda kwevoltage papini yechiratidzo chemudziyo inoshanduka nekuchinja kwechiratidzo;

3), kana mutsara usingatarise iyo 3W musimboti, akasiyana masaini masaini anokonzeresa crosstalk;

Wiring yechiratidzo chewachi

1, mutsara wewachi unofanirwa kufamba muchikamu chemukati cheyakawanda-layer PCB board. Uye iva nechokwadi chekutevera mutsara weribhoni; Kana iwe uchida kufamba pane yekunze layer, chete microstrip mutsara.

2, iyo yemukati dhizaini inogona kuona yakakwana yemufananidzo ndege, inogona kupa yakaderera-impedance RF yekufambisa nzira, uye kugadzira magineti flux kudzikamisa iyo magineti flux yekwavo sosi yekufambisa mutsara, padyo chinhambwe pakati pechitubu uye nzira yekudzoka, zviri nani kuderedza. Nekuda kwekuwedzera demagnetization, yega yega yakazara planar mufananidzo layer yeyakakwira-density PCB inopa 6-8dB kudzvinyirira.

3, mabhenefiti eakawanda-layer board: pane dhizaini kana akawanda akaturikidzana anogona kutsaurirwa kune akazara magetsi uye ndege yepasi, inogona kugadzirwa kuita yakanaka decoupling system, kuderedza nzvimbo yepasi loop, kuderedza kusiyanisa maitiro. radiation, kuderedza EMI, kuderedza iyo impedance level yechiratidzo uye simba rekudzoka nzira, inogona kuchengetedza kuwirirana kweiyo yose mutsara impedance, kuderedza crosstalk pakati pemitsetse iri padyo.