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參數(shù)資料
| 型號： | IBM42F10SNNAA20 |
| 廠商： | IBM Microeletronics |
| 英文描述： | SFF-1063/1250N-SW PTH Serial Optical Transceiver(SFF-1063/1250N-SW PTH串行光纖收發(fā)器) |
| 中文描述： | SFF-1063/1250N-SW普通話系列光收發(fā)器（SFF-1063/1250N-SW普通話串行光纖收發(fā)器） |
| 文件頁數(shù)： | 6/7頁 |
| 文件大?。?/td> | 465K |
| 代理商： | IBM42F10SNNAA20 |
Application Note
SFF-1063/1250N-SW PTH Serial Optical Transceiver Design & Layout Guide
Page 6
optxcvr.fm
July 2000
Appendix A: Stripline Transmission Lines
An example stripline transmission line configuration
is shown in Figure 3. A similar layout can be used on
host PC board designs for long high speed data
lines. The example transmission line is built on a
glass-epoxy (FR4) PC board. The dimensions
shown are taken from a stripline incorporated into an
IBM test card and are for reference only.
Mathematical modeling of stripline transmission
characteristics is complex due to the interaction of
multiple PC board properties and parameters. The
example stripline has a line-to-line impedance of just
over 100 ohms and a line-to-ground impedance con-
siderably higher than 50 ohms. Although the IBM
engineering specification
1063/1250 MBd Small
Form Factor Transceiver with Signal Detect
and this
application note state that high speed data lines
must have an impedance of 100 ohms line-to-line
and 50 ohms line-to-ground, it is not possible to
build a practical stripline to meet these require-
ments.
In applications where high-speed data lines remain
entirely on the host PC board, the more critical of the
two impedances is 100 ohms line-to-line for the dif-
ferential pair. To achieve this impedance for a practi-
cal stripline, the line-to-ground impedance of the
differential pair must be considerably higher than 50
ohms.
Figure 3: Stripline Transmission Line Example
Note: All dimensions are in mils.
10.0
1.9 (0.5 oz copper foil and plating)
1.2 (1.0 oz copper)
4.0
4.5
FR4
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