PCB LAYOUT

Why Crystal Oscillators Should Not Be Placed at PCB Edges

2026-03-31

A car dash cam failed radiation emission tests when powered by an external adapter, with excessive emissions detected at 84 MHz, 144 MHz, and 168 MHz. The root cause of the non-compliance needed to be analyzed, and corresponding countermeasures proposed.

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What Are PCB Impedance Testing Methods? Six Key Factors Affecting PCB Impedance

2026-03-31

PCB impedance strips and impedance traces are special metal areas and lines on Printed Circuit Boards (PCBs) designed to ensure impedance matching of circuit conductors. Their role is to control signal transmission speed, reduce signal interference and loss, and guarantee the accuracy of data transmission.

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Four Common Types of PCB Solder Mask

2026-03-30

When studying circuit boards, especially as a beginner in the electronics industry, I always wondered why the top layer of PCBs is green. Answers vary, but everyone agrees on one thing: solder mask aids inspection, protects conductors, and reduces eye fatigue during manual assembly. Different types of PCB solder mask vary in application method, composition, and cost.

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How to Define HDI Board Order & Differences Between HDI Boards and Standard PCBs

2026-03-30

HDI (High Density Interconnect) board order is defined by its structural design and manufacturing process. Typically, the order is related to the number of layers, wiring density, and process complexity.

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Step-by-Step Guide to Routing GND on PCBs

2026-03-30

During circuit schematic design, engineers typically define different GND ground lines as the 0V reference for various functional circuits to form independent current loops, thereby reducing mutual interference between circuits.

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In-Depth Explanation of Decoupling Capacitors: PCB Layout and Routing

2026-03-27

Decoupling capacitors (also called bypass capacitors) are placed near the power pins of components to filter high-frequency noise, stabilize voltage, and ensure normal operation.

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Fundamentals of Signal Integrity in Digital Design

2026-03-27

Traditionally, digital design has been relatively straightforward. Designers could develop circuits operating at frequencies up to 30 MHz without worrying about transmission line effects, because at lower frequencies signals remain within data-specified ranges, allowing normal system operation.

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I connected to ground! No, you connected to dirt!

2026-03-27

Grounding is extremely important in electronic design. A proper ground is NOT just connecting to dirt or soil!

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