Differential Pair Impedance: Why USB and HDMI Routing Is a Geometry Problem
The article discusses the importance of differential pair impedance in high-speed interfaces like USB and HDMI. It explains how the geometry of trace pairs affects their impedance and the necessity of matching this impedance to avoid signal issues. The author emphasizes that proper design choices regarding trace width and spacing are crucial for achieving the desired performance.
- ▪Differential pairs are essential for high-speed data transmission, requiring specific impedance values to function correctly.
- ▪USB requires a differential impedance of 90 ohms, while HDMI and other standards typically require 100 ohms.
- ▪The geometry of the traces, including their width and spacing, directly influences their differential impedance.
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try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3944450) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } NovaSolver Posted on May 23 • Originally published at novasolver.jp Differential Pair Impedance: Why USB and HDMI Routing Is a Geometry Problem #engineering #science #differential #em Every fast interface on a modern board — USB, HDMI, PCIe, Ethernet, SATA — sends its data as a differential pair: two traces carrying equal and opposite signals. The receiver listens to the difference between them, which rejects noise beautifully.
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