如何处理实际布线中的一些理论冲突的问题.pdf
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1 /
/
/“” 2
CPU CPU
PCB EMCEMI
1. , / (moat),
(returning current path) 2.
, , loop gain phase ,
, ground guard traces ,
, 3. EMI
EMI ferrite bead,
, PCB EMI ,
ferrite bead ,
2.
(output
impedance)(topology)(termination)
(
)
(side-by-side)(over-under)side-by-side
.
2
pcb
1GHz 50 50
100
(conductor loss), (skin effect),
dielectric loss (transmission line effect),
, ,
(voltage divider) ,
,
(differential impedance),
, ,
(signal integrity)(timing delay) 2(Z11 - Z12), , Z11
, Z12 , , 100
, 50 ,
4
, , ,
, , (moat)
5 PCB
PCB
dual stripline
6
(p4 )layour(cpu)?
(transmission line effect)
(reflec
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