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PCB Layout - PCB ground layer considerations
Old system assemblies, based on vacuum tubes, were often made directly on the manufacturing floor without any PCB support. With the increased signal frequency and system integration, made possible by transistors and ICs, using a PCB was a must. Nevertheless, till the 80’, regulations were not covering commercial products as they do today. EMC (Electromagnetic Compatibility) and immunity tests are today part of the system requirements that may challenge the designer during the design phase. High-speed applications, precision analog, and the regulations that the system must fulfill, make the PCB a fundamental part of the design puzzle. In this article, we will take a closer look at the PCB ground layer. Using it is very important, but sometimes it could lead to more problems than benefits...
PCB Layout - understand stray capacitance and inductance
The PCB board layout is the last challenge after having designed the schematic. While things may work on sub-modules level, once all the system gets assembled on the PCB, additional problems may occur. Several “Tips and Tricks Cookbooks” are providing recommendations to the designer making the PCB layout the right way. Nevertheless properly understanding the limitation and boundary conditions at which a certain rule can be used, is fundamental. Thus, in this article, rather than talking about “Tips and Tricks” we will go down to the details of understanding from where the stray capacitance and inductance come from. Indeed, the two are responsible of the major problems a wrong layout may cause at system level.
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