This paper discusses the fundamental requirements of power integrity (PI), and the most important concept used in PI, the network impedance. It answers the questions commonly asked by digital designers on how a power delivery network (PDN) is represented, how PDN impedance is generally defined, what the target impedance is and its effective range, and the factors affecting impedance analysis. The paper also addresses the contributions of IC current, package inductance, and on-die capacitance to PDN impedance analysis.
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.
Three driving forces are radically changing CAD library construction. The first is lead-free solder. The next is metric units. And lastly is "component manufacturer chaos." This term describes component manufacturers who no longer follow JEDEC packaging standards and are leading the way for new component package development. It seems as though the constraints of standard package data have been thrown out the window and new unique electronic device packages are emerging on the market at light speed. These challenges will continue to impact CAD library development and maintenance as we move forward.
Sunstone Circuits’ technological collaboration with Digi‐Key Corp. and NXP Semiconductor provides Sunstone PCB123 CAD users access to ready‐made, certified parts symbols from NXP. Not only is sufficient information provided to ensure accurate physical design, but the collaboration also ensures efficient design with component availability and pricing information. Within the Sunstone ECOsystemSM, these new functional elements provide the end user with a turnkey level of convenience and accuracy, even when working on prototypes and early engineering projects.
The white paper can be downloaded here.
This white paper gives pros and cons of 13 critical issues to consider before making the decision whether to manufacture onshore or offshore. Authored by QCircuits Inc. president Jeff Cosman, who has an MBA from Harvard and is a veteran of General Electric, it includes tips on anticipating problems and avoiding hidden costs.Click here for a copy.
Is screen printing able to keep pace with quality demands and complex board layouts? Is new jet printing technology ready to fill the gap? A comparison study between the two methods reveals some interesting differences. Screen printers offer some possibilities for optimizing solder paste deposits, but optimization is far easier and quicker with the jet printer. At the same time, the ability to print individualized deposits on every single PCB pad may be the answer to the growing quality challenge.
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.