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Just Ask Happy: Ground Reference Planes
June 29, 2020 | I-Connect007 Editorial TeamEstimated reading time: Less than a minute

We asked for you to send in your questions for Happy Holden, and you took us up on it! The questions you've posed run the gamut, covering technology, the worldwide fab market, and everything in between. Enjoy.
Q: How important are GND reference planes in signals that are less than 50MHz, since 1/4 wavelength is about 30 inches?
A: GND is an essential part of the circuit. The return path for DC is the lowest resistance, but for the AC part of the signal, it is the lowest inductance.
Take the survey to pose your own question for Happy Holden.
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Brent Fischthal - Koh YoungSuggested Items
New Episode Drop: MKS’ ESI’s Role in Optimize the Interconnect
08/21/2025 | I-Connect007In this latest episode, Casey Kruger, director of product marketing at MKS’ ESI, joins On the Line With… host Nolan Johnson to share how CO₂ laser technology delivers faster, more accurate vias in a smaller, more energy-efficient footprint.
Revolutionizing PCB Production Through MES, Partnerships, and Vision
08/21/2025 | Barry Matties, I-Connect007Two years ago, we visited Schweitzer Engineering Laboratories (SEL) to better understand its new captive greenfield PCB facility. We recently returned, this time to discuss how this bold vision has transformed the industry. Barry Matties met with John Hendrickson, engineering director, and Jessi Hall, vice president of vertical integration, to discuss the transformative capabilities of Factory Core, SEL’s custom manufacturing execution system (MES), which allows for real-time monitoring of workflow and machine performance, and has led to impressive improvements in quality and cost efficiency.
Inventing the Future: An Interview with Dr. Ed Schweitzer
08/20/2025 | Barry Matties, I-Connect007Dr. Edmund O. Schweitzer III, founder of Schweitzer Engineering Laboratories (SEL), has a corner office in the company’s world headquarters in Pullman, Washington. Forty-two years after his SEL-21—the first microprocessor-based digital protective relay—ushered in a new era of power-system protection, he has forever changed the way the world safeguards its electric grids. In this three-hour conversation, Dr. Schweitzer reveals that he remains excited to get to work each day, unpacking the “better, cheaper, faster, simpler” mantra that’s still driving SEL’s innovation, and the culture glue that keeps more than 7,000 employee-owners rowing in unison.
Amphenol to Acquire Trexon
08/19/2025 | BUSINESS WIREAmphenol Corporation announced a definitive agreement to acquire Trexon for approximately $1 billion in cash, subject to customary post-closing adjustments.
Happy’s Tech Talk #42: Applying Density Equations to UHDI Design
08/19/2025 | Happy Holden -- Column: Happy’s Tech TalkWith the need for faster speeds, more parts on an assembly, and the trend to make things smaller for portability, the printed circuit design and layout process is both creative and challenging. The process involves “applying the density equation” while considering certain boundary conditions, such as electrical and thermal performance. Unfortunately, many designers don’t realize there is a mathematical process to laying out a printed circuit.