Lub zog muaj zog (PI)
Fais fab kev ntseeg, hu ua PI, yog kom paub meej tias qhov voltage thiab tam sim no ntawm lub hwj chim qhov chaw thiab qhov chaw raws li qhov yuav tsum tau. Lub zog ncaj ncees tseem yog ib qho ntawm cov teeb meem loj tshaj plaws hauv kev tsim PCB high-speed.
Cov theem ntawm lub zog ncaj ncees suav nrog qib nti, qib ntim ntim, qib Circuit Court board thiab qib system. Ntawm lawv, lub zog ncaj ncees ntawm qib Circuit Court board yuav tsum ua tau raws li peb yam hauv qab no:
1. Ua kom qhov voltage ripple ntawm lub nti pin me dua qhov specification (piv txwv li, qhov yuam kev ntawm voltage thiab 1V yog tsawg dua +/ -50mv);
2. Tswj av rebound (tseem hu ua synchronous switching suab nrov SSN thiab synchronous switching tso zis SSO);
3, txo electromagnetic cuam tshuam (EMI) thiab tswj electromagnetic compatibility (EMC): fais fab kev faib network (PDN) yog tus neeg xyuas pib loj tshaj plaws ntawm lub rooj tsav xwm Circuit Court, yog li nws kuj yog tus kav hlau txais xov yooj yim tshaj plaws rau kev xa tawm thiab tau txais suab nrov.
Fais fab kev ncaj ncees teeb meem
Qhov teeb meem ntawm kev ncaj ncees ntawm cov khoom siv hluav taws xob feem ntau yog tshwm sim los ntawm qhov tsis tsim nyog tsim ntawm decoupling capacitor, kev cuam tshuam loj ntawm Circuit Court, qhov tsis zoo segmentation ntawm ntau lub zog hluav taws xob / hauv av dav hlau, kev tsim tsis tsim nyog ntawm kev tsim thiab qhov tsis sib xws tam sim no. Los ntawm kev simulation kev ncaj ncees ntawm lub zog, cov teeb meem no tau pom, thiab tom qab ntawd cov teeb meem kev ncaj ncees ntawm lub hwj chim tau raug daws los ntawm cov hauv qab no:
(1) los ntawm kev kho qhov dav ntawm PCB lamination kab thiab lub thickness ntawm dielectric txheej kom ua tau raws li qhov yuav tsum tau ntawm cov yam ntxwv impedance, kho cov qauv lamination kom tau raws li lub hauv paus ntsiab lus ntawm luv luv backflow txoj kab teeb liab, kho lub hwj chim mov / av dav hlau segmentation, zam qhov tshwm sim ntawm cov teeb liab tseem ceeb kab segmentation;
(2) Lub zog impedance tsom xam tau ua rau lub zog siv hluav taws xob siv rau ntawm PCB, thiab lub capacitor tau ntxiv los tswj cov khoom siv hluav taws xob hauv qab lub hom phiaj impedance;
(3) nyob rau hauv ib feem nrog high tam sim no ceev, kho txoj hauj lwm ntawm cov cuab yeej ua kom tam sim no hla txoj kev dav.
Kev txheeb xyuas lub zog ncaj ncees
Hauv kev txheeb xyuas kev ncaj ncees ntawm lub hwj chim, lub ntsiab simulation hom muaj xws li dc voltage poob tsom xam, decoupling tsom xam thiab suab nrov tsom. Dc voltage poob kev tsom xam suav nrog kev tsom xam ntawm txoj kab sib txuas thiab cov duab dav hlau ntawm PCB thiab tuaj yeem siv los txiav txim siab npaum li cas qhov hluav taws xob yuav poob vim qhov tsis kam ntawm cov tooj liab.
Qhia qhov ceev tam sim no thiab qhov ntsuas kub ntawm "qhov kub" hauv PI / thermal co-simulation
Kev tsom xam decoupling feem ntau tsav cov kev hloov pauv ntawm tus nqi, hom, thiab tus naj npawb ntawm cov capacitors siv hauv PDN. Yog li, nws yog ib qho tsim nyog yuav tsum muaj cov kab mob parasitic inductance thiab tsis kam ntawm tus qauv capacitor.
Hom kev ntsuas suab nrov yuav txawv. Lawv tuaj yeem suav nrog cov suab nrov los ntawm IC lub hwj chim pins uas nthuav tawm nyob ib puag ncig lub rooj tsav xwm hauv Circuit Court thiab tuaj yeem tswj tau los ntawm kev txiav tawm cov capacitors. Los ntawm kev soj ntsuam suab nrov, nws tuaj yeem tshawb xyuas seb lub suab nrov li cas los ntawm ib lub qhov mus rau lwm qhov, thiab nws muaj peev xwm txheeb xyuas cov suab nrov synchronous hloov.