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The characteristic impedance of transmission lines starts with the board stackup.

Broadside-Coupled Striplines: DFM Challenges

PCB ECAD software is highly intelligent and customizable to meet the needs of modern electronic design and manufacturing. Perhaps the most helpful tool for designers is the robust electronic rule checks that actively determine whether users are violating the predefined parameters for manufacturability; instead of waiting for a design review or feedback from the manufacturer,…

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PCB Beveling for Edge Connectors

PCB Dielectric Constant: Why Board Materials Matter

The dielectric constant of materials has taken on an increasingly larger role in manufacturing, with tighter tolerances on controlled impedance transmission lines and greater losses at high-speed rise/fall times.  While the dielectric constant is a material property, fabrication methods and the shape of laminates, sub-products, and other board materials can lead to a significant deviation…

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PCB layout constraints

PCB Drill Chart: What to Include

Manufacturers require accurate documentation from the design team to translate the manufacturing files into the expected board dimensions, performance, and other critical characteristics. These files correspond to individual steps in the manufacturing process, like the XY-data for pick-and-place assembly, Gerber/ODB++ for etch-resist photoimaging, and the PCB drill chart for drill hit location. The placement of…

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An ISO 9001 Certified Manufacturer Improves Quality

Embarking on production can become a harrowing ordeal for design teams unfamiliar with production quality or those previously burned by manufacturers without the necessary protocols. When time-to-market deadlines are tight, there can be significant pressure to find a manufacturer who meets cost, lot size, and production capabilities; however, all these factors are for naught if…

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PCB EMI Shields for Electromagnetic Compatibility

New designers and engineers may suffer from missing the forest for the trees. In this scenario, they become so laser-focused on solving a particular problem that they fail to account for how the solution fits into the overall design landscape. I recall a project where I spent ages pouring over datasheets for a pulse width…

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PCB Beveling for Edge Connectors

Avoiding PCB Misregistration During Fabrication

All but the simplest boards today utilize multiple layers to accommodate increasingly dense interconnections or smaller board areas. Four-layer PCBs are exceedingly popular and pose little additional processing difficulties for manufacturers; further layer counts are also easily achievable. However, the presence of multiple conductor layers means manufacturers must be aware of these layers’ linear and…

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