Mphamvu yokhulupirika (PI)

Power Integrality, yomwe imatchedwa PI, ndikutsimikizira ngati magetsi ndi magetsi a Power source ndi kopita akukwaniritsa zofunikira. Kukhulupirika kwamphamvu kumakhalabe chimodzi mwazovuta zazikulu pamapangidwe a PCB othamanga kwambiri.

Mulingo wa umphumphu wa mphamvu umaphatikizapo mulingo wa chip, mulingo wa chip phukusi, mulingo wa board board ndi mulingo wamakina. Pakati pawo, kukhulupirika kwamphamvu pamlingo wa board board kuyenera kukwaniritsa zofunikira zitatu izi:

1. Pangani voteji ripple pa chip pini yaying'ono kuposa specifications (mwachitsanzo, cholakwika pakati voteji ndi 1V ndi zosakwana +/ -50mv);

2. Control ground rebound (yomwe imatchedwanso synchronous switching phokoso SSN ndi synchronous switching linanena bungwe SSO);

3, chepetsani kusokoneza kwa ma elekitiroma (EMI) ndikusunga kuyanjana kwamagetsi (EMC): network distribution network (PDN) ndiye kondakitala wamkulu kwambiri pa board board, ndiyenso ndiye mlongoti wosavuta kufalitsa ndikulandila phokoso.

Vuto la kukhulupirika kwamphamvu

Vuto la umphumphu wamagetsi makamaka limayamba chifukwa cha mapangidwe osayenerera a decoupling capacitor, chikoka chachikulu cha dera, magawo oyipa amagetsi angapo / ndege yapansi, mapangidwe osagwirizana ndi mapangidwe amakono. Kupyolera mu kayesedwe ka umphumphu wa mphamvu, mavutowa anapezeka, ndiyeno mavuto a umphumphu wa mphamvu anathetsedwa ndi njira zotsatirazi:

(1) ndi kusintha m'lifupi PCB lamination mzere ndi makulidwe a dielectric wosanjikiza kukwaniritsa zofunika khalidwe impedance, kusintha dongosolo lamination kukwaniritsa mfundo ya yochepa backflow njira ya mzere chizindikiro, kusintha magetsi / pansi ndege segmentation, kupewa zochitika za magawo ofunikira a mzere wa mzere;

(2) kusanthula kwamphamvu kwamphamvu kunachitika pamagetsi omwe amagwiritsidwa ntchito pa PCB, ndipo capacitor idawonjezedwa kuti ilamulire magetsi omwe ali pansi pa chandamale chandamale;

(3) mu gawo lomwe lili ndi kachulukidwe kakang'ono kamakono, sinthani malo a chipangizocho kuti magetsi adutse njira yotakata.

Kusanthula umphumphu wa mphamvu

Pakuwunika kukhulupirika kwamphamvu, mitundu yayikulu yofananira imaphatikizapo kusanthula kwa dc voltage drop, kusanthula kwapang'onopang'ono ndi kusanthula phokoso. Dc voltage drop analysis imaphatikizapo kusanthula mawaya ovuta ndi mawonekedwe a ndege pa PCB ndipo angagwiritsidwe ntchito kudziwa kuchuluka kwa magetsi omwe atayika chifukwa cha kukana kwa mkuwa.

Imawonetsa ma graph apano komanso kutentha kwa "malo otentha" mu PI / matenthedwe ofananira

Kusanthula kwapang'onopang'ono kumapangitsa kusintha kwa mtengo, mtundu, ndi kuchuluka kwa ma capacitor omwe amagwiritsidwa ntchito mu PDN. Chifukwa chake, ndikofunikira kuphatikiza parasitic inductance ndi kukana kwa chitsanzo cha capacitor.

Mtundu wa kusanthula phokoso ukhoza kusiyana. Zitha kuphatikiza phokoso lochokera ku zikhomo zamphamvu za IC zomwe zimafalikira kuzungulira bolodi lozungulira ndipo zimatha kuwongoleredwa ndi ma decoupling capacitors. Kupyolera mu kusanthula phokoso, ndizotheka kufufuza momwe phokosolo limagwirizanirana kuchokera ku dzenje kupita ku lina, ndipo n'zotheka kusanthula phokoso la synchronous switching.