Hauv siab -kev tsim PCB ceev, teeb liab kev ncaj ncees, electromagnetic compatibility (EMI), thiab routing efficiency yog qhov tseem ceeb. Txhawm rau kom ntseeg tau tias siab - cov qauv tsim tau zoo, cov kws tsim khoom yuav tsum ua raws li cov txheej txheem kev coj ua, tab sis qee zaum cov laj thawj tom qab cov cai no tsis meej! Hauv qab no yog qee cov kev cai uas tau piav qhia, uas peb vam tias yuav pab tau.
1. High-Speed Signal Routing Shielding Txoj Cai
Yog vim li cas: Unshielded los yog tsis tiav shielded tseem ceeb heev - ceev teeb liab kab, xws li moos teeb liab, tuaj yeem ua rau EMI to.
Kev ntsuas tshwj xeeb: Nws raug nquahu kom siv vias rau hauv av txhua 1000mil ntawm kev tiv thaiv kom txo tau EMI cuam tshuam.
2. Siab-Speed Signal Routing Kaw-Txoj Cai Loop
Yog vim li cas: Kaw loops tsim nyob rau hauv ntau- txheej PCB routing tuaj yeem tsim lub voj voog kav hlau txais xov, nce EMI hluav taws xob siv.
Kev ntsuas tshwj xeeb: Tsis txhob tsim cov voj voog kaw hauv ntau- txheej PCBs rau siab - cov teeb liab ceev, xws li cov cim moos.
3. Siab-Speed Speed Signal Routing Qhib-Txoj Cai Loop
Yog vim li cas: Qhib loops tsim nyob rau hauv multi- txheej PCB routing tuaj yeem tsim cov kav hlau txais xov kab, kuj ua rau EMI hluav taws xob ntau ntxiv.
Kev ntsuas tshwj xeeb: Tsis txhob tsim cov voj voog qhib hauv ntau - txheej PCBs rau siab - cov teeb liab ceev.
4. Siab -Speed Signal yam ntxwv Impedance Continuity txoj cai
Yog vim li cas: Discontinuities nyob rau hauv cov yam ntxwv impedance thaum inter-txheej txheej switching nce EMI hluav taws xob.
Kev ntsuas tshwj xeeb: Ua kom muaj qhov dav txuas ntxiv ntawm cov kab nyob hauv tib txheej thiab txuas ntxiv impedance ntawm cov kab hla sib txawv.
5. Routing Direction Rules nyob rau hauv siab -Speed PCB Tsim
Yog vim li cas: Tsis yog - cov kab nyob ib sab ntawm cov khaubncaws sab nraud povtseg ua rau crosstalk, nce EMI hluav taws xob.
Cov Kev Ntsuas Tshwj Xeeb: Cov txheej txheem kev sib txuas uas nyob ib sab yuav tsum ua raws kab rov tav - mus rau - kev taw qhia ntsug kom txwv kev sib tham.
6. Txoj Cai Topology hauv High-Speed PCB Tsim
Yog vim li cas: Ib qho tsim nyog topology cuam tshuam ncaj qha rau cov yam ntxwv impedance tswj thiab kev ua tau zoo nyob rau hauv ntau yam loads.
Kev ntsuas tshwj xeeb: Hauv siab- qauv PCB ceev, nws raug nquahu kom siv lub nraub qaum- hnub qub kawg - zoo li tus qauv symmetrical es tsis txhob daisy- saw topology feem ntau siv hauv tsawg- cov ntawv thov zaus.
7. Txoj Cai Length Resonance
Yog vim li cas: Thaum cov kab ntev thiab cov teeb liab zaus resonate, electromagnetic nthwv dej yog tawg, tsim kev cuam tshuam.
Kev ntsuas tshwj xeeb: Tshawb xyuas cov teeb liab kab ntev thiab tsis txhob ua rau lawv qhov sib npaug ntawm 1/4 ntawm lub teeb liab wavelength los tiv thaiv resonance.
8. Rov qab Txoj Cai
Yog vim li cas: High- cov teeb liab ceev uas tsis muaj txoj kev rov qab zoo yuav muaj hluav taws xob ntau ntxiv.
Kev ntsuas tshwj xeeb: xyuas kom meej tias txoj kev rov qab los rau siab - cov cim ceev xws li cov cim moos raug txo kom tsawg. Radiation yog ncaj qha proportional rau thaj chaw uas nyob ze ntawm lub teeb liab txoj kev thiab txoj kev rov qab los.
9. Txoj cai muab tso rau Capacitor Decoupling
Yog vim li cas: Qhov chaw tsis raug ntawm decoupling capacitors yuav ua tsis tiav qhov xav tau decoupling nyhuv.
Kev ntsuas tshwj xeeb: Decoupling capacitors yuav tsum tau muab tso rau ze rau lub hwj huam mov pins, thiab thaj chaw uas muaj lub hwj chim thiab hauv av kab ntawm lub capacitors yuav tsum raug txo kom tsawg.