Yawan yadudduka na PCB ya dogara da rikitarwa na jirgin kewaye. Daga hangen nesa na sarrafa PCB, PCB mai ɗimbin yawa an yi shi da “PCB panel biyu” masu yawa ta hanyar tarawa da dannawa. Koyaya, adadin yadudduka, jerin jeri da zaɓin allon PCB mai ɗimbin yawa ana ƙaddara su ta mai zanen PCB, wanda ake kira “ƙirar ƙirar PCB”.

Abubuwan da za a yi la’akari da su a cikin ƙirar ƙirar PCB

Yawan yadudduka da shimfidar ƙirar PCB ya dogara da dalilai masu zuwa:

1. Kudin kayan aiki: Yawan yadudduka na PCB yana da alaƙa kai tsaye da farashin kayan aikin ƙarshe. Da ƙarin yadudduka akwai, mafi girman farashin kayan aikin zai kasance.

2. Wayoyin abubuwa masu girma: abubuwan da ke da ƙarfi da aka wakilta na’urorin marufi na BGA, yadudduka wayoyin irin waɗannan abubuwan da gaske suna ƙayyade yadudduka na allon PCB;

3. Sarrafa ingancin sigina: don ƙirar PCB tare da ɗaukar siginar siginar sauri, idan an mai da hankali kan ingancin siginar, ana buƙatar rage wayoyi na yadudduka na kusa don rage ƙwanƙwasa tsakanin sigina. A wannan lokacin, rabo na yadudduka wayoyi da yadudduka masu tunani (Layer ƙasa ko Layer Power) shine mafi kyau 1: 1, wanda zai haifar da haɓaka ƙirar ƙirar PCB. Sabanin haka, idan kulawar ingancin siginar ba ta zama tilas ba, ana iya amfani da makullin layin wiring na kusa don rage adadin yadudduka na PCB;

4. Ma’anar siginar ƙira: Ma’anar siginar ƙira za ta ƙayyade ko wayoyin PCB suna “santsi”. Ma’anar siginar ƙira mara kyau zata haifar da wayoyin PCB marasa dacewa da haɓaka yadudduka wayoyi.

5. Tushen ƙarfin sarrafa masana’anta na PCB: ƙirar ƙirar ƙirar (hanyar tarawa, kauri mai kauri, da sauransu) wanda mai zanen PCB ya bayar dole ne ya ɗauki cikakken lissafin tushen ƙarfin sarrafa masana’anta na PCB, kamar tsarin sarrafawa, iya sarrafa kayan aiki, farantin PCB da aka saba amfani dashi. model, da dai sauransu.

Tsarin cascading PCB yana buƙatar fifitawa da daidaita duk tasirin ƙirar da ke sama.

Dokokin gabaɗaya don ƙirar cascade PCB

1. Samar da siginar siginar yakamata a haɗa su sosai, wanda ke nufin cewa tazara tsakanin samuwar da layin wutar yakamata ya zama ƙarami sosai, kaurin matsakaici ya zama ƙarami kaɗan, don haɓaka capacitance tsakanin ƙarfin wutar lantarki da samuwar (idan ba ku fahimta a nan ba, kuna iya tunanin ƙarfin farantin, girman ƙarfin ya yi daidai da tazara).

2, yadudduka sigina biyu har zuwa yiwu ba kai tsaye kusa ba, don haka mai sauƙin siginar siginar, yana shafar aikin da’irar.

3, don allon da’irar da yawa, kamar allon Layer 4, allon Layer 6, buƙatun gabaɗaya na siginar siginar har zuwa yiwu da Layer na lantarki (Layer ko wutar lantarki) kusa, don ku iya amfani da manyan Yankin murfin murfin wutar lantarki na cikin gida don taka rawa wajen kare layin siginar, ta yadda za a guji ɓarna tsakanin layin siginar.

4. Don babban siginar siginar sauri, gabaɗaya tana tsakanin layuka biyu na lantarki na ciki. Manufar wannan ita ce samar da ingantaccen garkuwar garkuwar don siginar siginar sauri a gefe guda, da kuma takaita siginar mai sauri tsakanin yadudduka na lantarki na ciki guda biyu a gefe guda, ta yadda za a rage katsalandan na sauran yadudduka na sigina.

5. Yi la’akari da sifar tsarin cascade.

6. Yawaitar yadudduka na lantarki na cikin gida na iya rage rashin ƙarfi na ƙasa.

Shawarar tsarin cascading

1, babban mayafin wayoyi a cikin saman Layer, don gujewa amfani da madaidaicin wayoyi zuwa rami da shigar da shigar. Layin bayanai tsakanin babban mai keɓewa da watsawa da karɓar madaidaiciya ana haɗa su kai tsaye ta hanyar madaidaitan wayoyi.

2. An sanya jirgin ƙasa a ƙasa da babban siginar siginar mitar don sarrafa rashin jituwa na layin haɗin watsawa da kuma samar da ƙarancin hanyar haɓaka don saurin dawowa don gudana.

3. Sanya Layer na samar da wutar lantarki a ƙarƙashin layin ƙasa. Layukan tunani guda biyu suna samar da ƙarin hf bypass capacitor na kusan 100pF/ INCH2.

4. An shirya siginar kula da saurin-sauri a cikin wayoyin ƙasa. Waɗannan lamuran suna da fa’ida mafi girma don tsayayya da dakatarwar rashin ƙarfi ta hanyar ramuka, don haka ba da damar sassauƙa mafi girma.

Kuna iya fahimtar ƙirar cascade PCB

Misalin ƙirar farantin huɗu mai ƙyalli

Idan ana buƙatar ƙarin yadudduka na samar da wutar lantarki (Vcc) ko yadudduka sigina, ƙarin ƙarin ƙarfin wutar lantarki na biyu dole ne a daidaita su. Ta wannan hanyar, tsarin da aka shimfiɗa yana da tsayayye kuma allon ba zai warke ba. Ƙarfin wutar lantarki tare da ƙwanƙwasa daban -daban yakamata ya kasance kusa da samuwar don haɓaka madaidaicin ƙimar ƙarfin wucewa kuma don haka murkushe amo.