Mark Houck is a Senior PCB Designer at Re:Build AppliedLogix with more than 20 years of experience designing complex printed circuit boards for commercial, industrial, aerospace, and other high-performance applications. His expertise includes multilayer PCB layout, controlled impedance routing, PCB stack-up development, signal integrity collaboration, and designing manufacturable hardware for demanding environments.
When people think about printed circuit board (PCB) design, they often picture components being placed and traces being routed between them.
In reality, that’s only one part of the job.
Designing a reliable PCB requires balancing electrical performance, manufacturability, mechanical constraints, thermal considerations, and signal integrity—all before the board is ever manufactured.
After more than 20 years designing PCBs, I’ve learned that the difference between a board that simply works and one that performs reliably often comes down to the decisions made long before routing begins – especially the PCB stack-up and design-for-manufacturability choices.
One of the biggest misconceptions about PCB layout is that routing is where the design process begins.
In my experience, successful PCB designs start much earlier—with the PCB stack-up. The stack-up establishes the foundation for controlled impedance, signal integrity, return current paths, manufacturability, and routing strategy. Once that’s defined, component placement becomes the next priority because every placement decision influences routing efficiency, thermal performance, and overall electrical behavior.
One lesson I’ve learned throughout my career is that a PCB isn’t just an electrical design, it’s also a mechanical product. A quality engineer I worked with years ago used to say, “It’s not electrical until you plug it in”. Before placing a single component, I’m thinking about board thickness, component heights, spacing, vibration requirements, enclosure constraints, and thermal management just as much as electrical performance.
One recent DDR4 project reinforced something I’ve seen throughout my career: high-speed PCB design isn’t about following a checklist, it’s about understanding the fundamental electromagnetic principles that govern digital signal propagation within a PCB.
Maintaining controlled impedance, matching signal lengths, managing via impedance, preserving continuous reference planes, and keeping related signals together all contribute to reliable signal integrity and timing performance. These high-speed PCB layout practices reduce crosstalk, reflections, and skew in modern bus interfaces like DDRx, PCIe, and JESD204
Every PCB introduces its own set of unique mechanical, electrical, and manufacturing constraints. That’s where a depth of past experience combined with sound engineering judgment become just as valuable as technical specifications – selecting the materials, defining the PCB stack-up, and tuning placement and trace routing rules for manufacturability and yield.
Even after more than 20 years designing PCBs, I still believe one of the best engineering tools is another set of eyes.
Peer design reviews catch things that software can’t. Sometimes it’s a missing bus connection. Sometimes it’s an enable signal. Sometimes it’s simply asking, “should this really work this way?” Cross-functional reviews with signal integrity engineers, mechanical engineers, and manufacturing experts help validate the layout against the constraints.
I’ve learned it’s far easier to prevent problems through early conversations than to troubleshoot hardware after fabrication. Engineering has never been about having all the answers—it’s about asking the right questions and aligning PCB design decisions with product requirements.
Robust PCB design doesn’t happen by chance. It requires the judgment that only experience brings.
Technology changes quickly, but the fundamentals don’t. Understand the signal propagation principles that govern the interconnects you create. Plan before you route. Respect manufacturability. Collaborate with your team. Applying a zero-defects mentality is essential – review your work carefully. For high-speed PCB design, focus on stack-up definition, return paths, and clear constraints for impedance, length matching, and differential pairs.
People often think PCB designers simply “connect the dots”. I like to say we connect the dots intelligently—and that’s what transforms a PCB layout into a reliable and manufacturable product with robust signal integrity.
The best PCB designs don’t happen by chance. They are the result of thoughtful planning, technical expertise, process discipline, and close collaboration across engineering teams.
Whether I’m developing a PCB stack-up, routing a high-speed DDRx interface, or reviewing a schematic before layout, every decision contributes to the reliability of the final product. Optimizing for signal integrity and controlled impedance from day one pays off in manufacturing yield and system performance.
For me, successful PCB design isn’t measured by how quickly traces are routed. It’s measured by delivering fully functional and durable hardware that performs in the lab and in the field.
Whether you’re developing a new product, redesigning an existing PCB, or solving a complex high-speed layout challenge, the decisions made during PCB design have a lasting impact on performance, manufacturability, and long-term reliability.
At Re:Build AppliedLogix, our senior PCB designers work alongside electrical engineers, signal integrity specialists, mechanical engineers, firmware developers, FPGA engineers, and manufacturing experts to solve complex design challenges and deliver world-class results.From stack-up and material selection to impedance modeling and DFM reviews, we align design decisions with your product goals.
If you’re looking for an engineering partner to support your next PCB design, our team is ready to help. Let’s get the conversation started – see the form below.
A PCB designer transforms an electrical schematic into a manufacturable PCB by optimizing component placement, routing, stack-up, and design rules while balancing electrical performance, manufacturability, and reliability.
Controlled impedance is the practice of designing PCB traces with a specific, predictable electrical resistance to signal flow—called characteristic impedance, measured in ohms (Ω).
Why it matters:
In high-speed digital signaling, traces aren’t just connections—they behave as electrical transmission lines. Designers must manage the signal trace topology and trace impedance while accounting for the source impedance and load impedance, in order to maximize the signal quality delivered to the receiver(s). When impedance control is lacking, the intended circuit behavior is often compromised:
What controls it:
Trace impedance depends on physical geometry:
A PCB stack-up defines the board’s multi-layer structure including the materials, dielectric spacing, via types and construction, and reference planes. It is the foundation for impedance control, signal integrity, EMI/EMC performance, and overall routing strategy in high-speed PCB layouts.
PCB design defines the functional requirements and performance targets, specifying a system architecture that fully meets those goals, key components review and selection, circuit design, simulation and schematic capture. PCB layout focuses on the physical implementation of the design through placement, routing, and verification for manufacturability.
Companies often benefit from outsourcing PCB design when tackling high-speed layouts, compressed schedules, limited internal resources, or products requiring specialized expertise in signal integrity, controlled impedance, and design-for-manufacturability.
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