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參數(shù)資料
| 型號： | AN246 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Transmission lines and terminations with Philips Advanced Logic families |
| 中文描述： | 傳輸線，并與飛利浦先進邏輯家庭終端 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 216K |
| 代理商： | AN246 |
Philips Semiconductors
Application Note
AN246
Transmission lines and terminations
with Philips Logic families
1998 Feb 05
8
Another tool that is useful for evaluating these effects is SPICE
models. Philips Semiconductors offers free models for our FAST,
ALS, HCMOS, ABT, ABT16, ALVC, ALVT, LV, LVC, LVT, and LVT16
product families to aid in signal integrity evaluation. The models
help reduce design time by eliminating time consuming efforts of
reflection and Bergeron diagrams, and they also help predict signal
integrity prior to board layout.
As an example, the circuit in Figure 10 was modeled and the results
are shown in Figure 11. A pulse was fed into the ALVC16244 and
the input and output waveforms were observed. This example
illustrates the effect of reflections due to the mismatch of the driver
impedance (around 10
) and the transmission line.
Note that the overshoot and undershoot in Figure 11 may not be
acceptable to drive other 3V device inputs or DRAM’s. To reduce
the overshoot and undershoot, line termination will be necessary.
SH00116
A
B
ALVC16244 Driver
ALVC16374 Receiver
Z
O
= 50
Figure 10. ALVC16244 driving ALVC16374 receiver
SH00104
Figure 11. SPICE simulation for the circuit in Figure 10.
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