Pcb Artwork Guide - Samsung S5PV210 Hardware Design Manual

S5PV210_HARDWARE DESING GUIDE REV 1.0
23.4.

PCB Artwork Guide

Transmission Line Design of Differential pairs
A)
For high-frequency signal transmission along the traces of the differential signals, the trace structure must
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be a transmission line structure. The strip line structure and the microstrip line structure are the most
recommended structures.
- For the traces of the differential pairs, the grounded plane should be a continuous plane. The ground plane of
the microstrip line and the strip line should be continuous. Any discontinuity or slot in the ground plane causes
signal reflections.
The differential line on the top layer of the PCB with the microstrip line structure is most recommended.
-
The number of via on the differential line should be minimized.
-
- pre-determined differential line impedance of the differential pairs is 100[Ohm].
And recommended range of the differential line impedance of the trace is between 95[Ohm] to 105[Ohm].
TX2P/N
TX1P/N
TX0P/N
TXCP/N
C110
with HDMI
Decoupling Capacitor
B)
Small size MLCC's are used. In all these cases, the capacitors should be placed as close as possible to the
-
package. When choosing these components, the smallest components should be chosen since they have the
least parasitic inductance.
- Ferrite Bead is used for high frequency noise rejection. But ferrite bead can induce IR voltage drop due to DC
resistance. We recommend to use ferrite bead with small DC resistance considering max current.
C) More general guidelines
Route the length of parallel signal lines is kept to same if possible.
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1X
HDMI
Connector
5X
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