Differential Pair Impedance: Why USB and HDMI Routing Is a Geometry Problem

May 23, 2026 · 12:17 AM UTC ·5 min read · 0 reactions · 0 comments · 23 views

TL;DR · WeSearch summary

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.

Key facts

▪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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Original publisher	DEV.to (Top)
Canonical URL	https://dev.to/01888927bd0e8aa92caca/differential-pair-impedance-why-usb-and-hdmi-routing-is-a-geometry-problem-4nm9
Publication time	Sat, 23 May 2026 00:17:01 +0000
Retrieval time	2026-05-23T01:02:03.674Z
Last seen	2026-05-23T01:02:03.674Z
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Excerpt method	First ~120 words (~800 chars) of extracted publisher body, fair-use limited.
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Publisher visit	Yes — open original
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Indexing	May the item be indexed (stored, ranked, made findable)?	Allowed
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Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.

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Opening excerpt (first ~120 words) tap to expand

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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