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Target Condition: Signal Integrity Without Borders

06/24/2026 | Kelly Dack -- Column: Target Condition
I started my PCB design career in 1980, long before “signal integrity” became a formal discipline. Back then, we were trying to “connect the dots” on simple, two-sided PCB layouts using the new $80,000 interactive graphics terminals we called a CAD system. By the time PCB design conferences emerged in the 1990s, signal integrity had begun to formalize into a discipline of its own. Much of the early, visible thought leadership came from North America and parts of Europe.

QTREX Expands into Quantum Processor Interface with Single-Build Cryogenic Chip Carrier

06/19/2026 | Globe Newswire
QTREX Quantum Ltd. a company focused on advancing Additively Manufactured Electronics (AME) for quantum computing infrastructure, announced a major technical and strategic milestone.

Marcy’s Musings: Old School vs. New School—When Does It Matter?

06/17/2026 | Marcy LaRont -- Column: Marcy's Musings
The battle between old and new is nothing new. Throughout history, technological progress has faced skepticism, resistance, and at times, outright hostility. Yet progress tends to win. In his book, "RenAIssance," author and APEX EXPO 2026 keynote Zack Kass illustrates this point beautifully. From hand weaving to sewing machines, from scribes to the printing press, from horse-drawn carriages to automobiles, and now to artificial intelligence, each technological leap has ultimately made our lives more productive and expanded what was possible.

Common vs. Differential Mode in Routing and Signal Integrity

06/11/2026 | Kristin Moyer, Sacramento State University and Global Electronics Association
In high-speed designs, the distinction between common-mode and differential-mode is becoming increasingly critical in PCB routing. While most designers are familiar with differential routing as a technique for certain signals on the PCB, many may not realize its underlying purpose. Differential routing is used to mitigate differential mode noise in the system. To understand this, we need a bit of electrical engineering background on signal and current flow in a system.

Elementary, Mr. Watson: Controlled Impedance—When ‘Connecting the Dots’ Stops Working

06/11/2026 | John Watson -- Column: Elementary, Mr. Watson
Signal integrity follows physics that are consistent, predictable, and fully explainable. But those rules don’t show up in the schematic. Instead, they live in the electromagnetic fields around the traces, in the stackup, and in the relationship between conductors and their return paths. The authors weren’t claiming black magic; they were calling out how it feels until you learn what’s going on. The fact that they said it more than 30 years ago only reinforces how fundamental and enduring these concepts really are.
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