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SN74CBT3244PWRG4 데이터시트(PDF) 10 Page - Texas Instruments |
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SN74CBT3244PWRG4 데이터시트(HTML) 10 Page - Texas Instruments |
10 / 31 page WORST BETTER BEST 1W min. W SN74CBT3244 SCDS001O – NOVEMBER 1992 – REVISED SEPTEMBER 2015 www.ti.com 11 Layout 11.1 Layout Guidelines Reflections and matching are closely related to the loop antenna theory but are different enough to be discussed separately from the theory. When a PCB trace turns a corner at a 90° angle, a reflection can occur. A reflection occurs primarily because of the change of width of the trace. At the apex of the turn, the trace width increases to 1.414 times the width. This increase upsets the transmission-line characteristics, especially the distributed capacitance and self-inductance of the trace, which results in the reflection. Not all PCB traces can be straight; therefore, some traces must turn corners. Figure 6 shows progressively better techniques of rounding corners. Only the last example (BEST) maintains constant trace width and minimizes reflections. 11.2 Layout Example Figure 6. Trace Example 10 Submit Documentation Feedback Copyright © 1992–2015, Texas Instruments Incorporated Product Folder Links: SN74CBT3244 |
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