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| 型號(hào)： | 21176 |
| 英文描述： | Designing 100BASE-TX? 86.8KB (PDF) System with the QFEX Family ? |
| 中文描述： | 設(shè)計(jì)100BASE - TX的？ 86.8KB（PDF格式）系統(tǒng)？與QFEX家庭 |
| 文件頁數(shù)： | 13/15頁 |
| 文件大?。?/td> | 86K |
| 代理商： | 21176 |
Designing 100BASE-TX Systems with the QFEX Family
13
not recommended to isolate system ground from PECL
ground, since ferrite beads add extra inductance that
affects the return signal path. For further PECL port
isolation, individual PECL ground planes can be added
at the expense of a more intricate design to minimize
signal path return. Separate PECL ground planes are
also more tedious to lay out in multiport designs.
Each plane is separated by a ferrite bead (recommend
Fair Rite 274-3019-446) that minimizes noise being
conducted through to the next plane. Differential pair
traces should be completely shrouded by the power/
ground plane it is in and should not cross into other
power/ground planes.
The plane area under the magnetics is left void for
optimum noise separation between the transmit/re-
ceive and chassis planes. The chassis plane connects
directly to the RJ-45 jacks, which are recommended to
be fully shielded. Additionally, 2-K volt capacitors con-
nected to chassis ground are required for ESD protec-
tion, per the 100BASE-X standard.
CONCLUSION
100BASE-TX repeater design is more intricate and
requires a greater design effort than 10BASE-T design.
However, there is a great amount of knowledge readily
available to designers since high-speed design is
already upon us.
The QFEXr device is relatively straightforward to de-
sign into a 100-Mbps repeater system. With integrated
four-port capability, the reduction in board space and
related components (otherwise needed for single port
PHYs), the QFEXr device provide an easier and more
cost-effective design for customers.
By following these rules for high-speed design and
recommendations of repeater design with the QFEXr
device, 100BASE-TX repeater designers should be
able to make the transition from the 10 Mbps arena in
a single leap.
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| 2118 | 2118 |
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| 2128E | In-System Programmable SuperFAST⑩ High Density PLD |
| 2128VE | 3.3V In-System Programmable SuperFAST⑩ High Density PLD |
| 2128VL | 2.5V In-System Programmable SuperFAST⑩ High Density PLD |
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