White Papers

The Universal PCB Design Grid System

This paper reviews one of the single most important, but sometimes overlooked or taken for granted, aspects of the electronics industry – The PCB Design Grid System. Mixing PCB Design Layout units will compromise perfection every time. PCB Design perfection starts with building CAD library parts and quickly moves to part placement, via fanout and trace routing challenges. Outputting data for machine production can be extremely complex or very simple based on the PCB Design Layout units that were used throughout the PCB design process.

Author: Mentor Graphics

Impact of Materials on Microwave Cable Performance

Presents important factors to consider when selecting microwave/RF cable assemblies to ensure reliable performance in today’s challenging conditions. Highlights the importance of identifying all of the electrical, mechanical, environmental, and application-specific conditions that will affect cable performance. Describes advantages and disadvantages of typical materials used in cable construction, including an explanation of the testing and data analysis a manufacturer should complete in order to verify that its cable will perform in a specific application.

Author: Paul Pino, lead design engineer, W. L. Gore & Associates


 

 

RoHS Compliant vs. RoHS Compatible

Author: New Age Technologies

Abstract: The desire to reduce pollution within our environment has led to the RoHS directive in the EU that restricts the use of certain hazardous substances in electrical and electronic equipment. Since that time, this environmental standard has spread to other parts of the world. These are the early days of RoHS, and it is not a simple matter to say let’s switch our products to RoHS. As a designer or an executive involved in decisions to move to RoHS, it is important to understand the complexity of this decision. Many individuals believe that converting to RoHS is just a matter of selecting RoHS components and manufacturing with lead-free solder. The issue is that many parts may be RoHS compliant, but they cannot handle the more extreme RoHS manufacturing process. This article is intended to clarify what it means for a component to be RoHS compliant
versus being RoHS compatible.

Published 2008

 

Design for Manufacturing (DFM): Defining the Processes

by New Age Technologies

With most assemblies, the difference between achieving ideal and having to compensate with
added cost is not a great variation in the design. If the PCB designer is aware of the impact to cost and quality,
the basic decisions made when initial component placement is generated are likely to have a long-term
positive impact on the overall product quality. Every effort should be made to educate PCB designers, and
design reviews should include DfM steps early in the design and layout process. Too often, DfM is inserted at
the end of a design project if it is done at all. Once the design has been accomplished, project schedules and
other demands tend to overtake the DfM concerns and the result is years of additional cost with no added
value, or even diminished value to the product integrity.

Published: 2008

High-Speed DSP Systems Design Reference Guide

by Texas Instruments

Today’s digital signal processors (DSPs) are typically run at a 1GHz internal clock rate while transmit and receive signals to and from external devices operate at rates higher than 200MHz. These fast switching signals generate a considerable amount of noise and radiation, which degrades system performance and creates electromagnetic interference (EMI) problems that make it difficult to pass tests required to obtain certification from the Federal Communication Commission (FCC). Good high-speed system design requires robust power sources with low switching noise under dynamic loading conditions, minimum crosstalk between high-speed signal traces, high- and low-frequency decoupling techniques, and good signal integrity with minimum transmission line effects. This document provides recommendations for meeting the many challenges of high-speed DSP system design.

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