Basic Printed Circuit Board Layout
Basic Printed Circuit Board LayoutAuthor: Pcb Solutions The connections on the PCB should be identical to the circuit diagram, but while the circuit diagram is arranged to be readable, the PCB layout is arranged to be functional. There is rarely any visible correlation between the circuit diagram and the layout. Printed circuit board layout can be performed manually (using CAD) or in combination with an auto-router. The best results are usually still achieved using at least some manual routing, simply because the design engineer has a far better judgment of how to arrange circuitry. Surprisingly, many auto-routed boards are often completely illogical in their track routing. The program has optimized the connections and sacrificed any small amount of order that may have been put in place by manual routing. Generally, auto-routed boards are somewhat harder for a technician to repair or debug, for this reason. Historically, PCBs used to be laid out by drawing or using stick-on paper shapes on mylar film - that really WAS manual routing! The CAD printed circuit board layout consists of several layers.
For illustration, often the layers will be colored and compressed into the one overlay image. When laying out boards, it’s usually best to try using actual size check plots at some stage during the design process. Most overlays need to be printed out enlarged to show the detail, but an actual size print, with mounting holes and possibly cutouts, is a great check tool.
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06.05.2010
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