In high-speed PCB design, differential pair impedance is the backbone of reliable data transmission. Protocols like USB, HDMI, PCIe, and Gigabit Ethernet rely on controlled differential impedance—typically 100Ω or 90Ω—to maintain signal integrity. This article compares edge-coupled vs broadside-coupled topologies to help you choose the best approach for your next high-speed board. The Fundamentals of…
In high-speed PCB design, understanding how skew between P and N affects differential pair impedance and common mode noise is critical for maintaining signal integrity. This page explains the physics, manufacturing realities, and mitigation strategies for this silent killer of high-speed performance. Section 1: The Foundation – What is Skew in a Differential Pair? Skew,…
In high-speed PCB design, managing signal integrity (SI) is paramount, especially for differential pairs used in protocols like USB, HDMI, PCIe, and Ethernet. One of the most critical yet often misunderstood phenomena is reflection in transmission lines, specifically the distinction between common mode and differential mode. While differential signaling inherently offers noise immunity, reflections can…
In high-speed PCB design, differential pair crosstalk is a critical signal integrity challenge that engineers must master. This comprehensive guide explores the two fundamental types of coupling—intra-pair and inter-pair—providing actionable strategies to optimize your high-speed PCB layouts for reliable performance at multi-gigabit data rates. Understanding Differential Pairs in High Speed PCB A differential pair in…