CISPR 25

Via placement and trace geometry significantly affect decoupling capacitor performance. This final installment of a three-part series presents conducted emissions measurements across six PCB via topologies, revealing how distance from the power-ground plane pair and via spacing impact EMC results.

Conducted emissions testing on custom PCBs shows how moving a decoupling capacitor farther from an IC can increase emissions across multiple frequency bands. Using CISPR 25 methods, this study compares capacitor placements and via topologies to reveal how distance and inductance shape PDN behavior.

Decades of global collaboration have shaped today’s automotive EMC standards. From CISPR 25 and ISO 11452 to UNECE R10, this piece reveals how harmonization, travel, technical debate, and human connection have created the consistent, repeatable EMC frameworks the industry depends on.

Explore how PCB via and trace geometry influence the real‑world effectiveness of decoupling capacitors. This first article in the series defines six board variants, capacitor placement strategies, and PCB topologies, setting the stage for upcoming RF emission results based on CISPR 25 testing.

Explore essential strategies for EMC testing of electric axles in automotive applications. This technical guide examines key challenges in achieving CISPR 25 compliance, from test bench design to managing metallic structures, while ensuring accurate and reproducible measurements for high-power e-drive systems.

This two-part article provides an overview of current automotive EMC standards and the intricacies of chamber testing automotive systems and components.

In this article, we establish design guidelines of a spread spectrum modulation circuit as it relates to CISPR 25.

Accredited test laboratories, complying with the requirements of ISO/IEC 17025 have to evaluate measurement uncertainty.

From open fields to shielded enclosures, radiated emissions testing demands precision at every step — this technical deep dive compares OATS and ALSE measurement methods, antenna configurations, and FCC and CISPR compliance limits across a broad frequency spectrum.

Current conducted‑emissions measurement practices under DO‑160 and CISPR 25 rely on shielded‑enclosure testing, LISNs, and current probes to evaluate RF noise on power lines. This overview walks through setups, limits, and real measurement results for both aerospace and automotive environments.