3/21/2024 0 Comments Pcb layout proteus 8![]() To do this a layer rule would be created with different clearances which would override the board rule on the specified layer.Īnother common requirement is for tight clearances on several layers in the area inside and around a fine pitch SMD or BGA to enable all of the signals to fanout and escape onto the board. For example, we may allow the space between tracks on inner layers to be smaller because they are better protected from things like dust and condensation. It’s very common however to want different clearances between objects in different parts of the PCB. The EDA tool will then monitor the distances between objects as the PCB is placed and routed and will warn us if objects violate the specified clearances. At its simplest level we define a distance between pads, between a track and a pad and between two tracks. This rule applies everywhere on the board that is not overridden by another rule. There is always a board rule, sometimes called the default rule. Physical scope starts of course with the entire PCB. Fortunately, the EDA industry has a well established and fairly standardized system for specifying electrical design rules, allowing us to limit a rule to a physical area of the PCB and/or to a certain number of signals. Modern electronic products are more complex than ever before, operating at higher speeds and needing to fit into smaller enclosures this means we need more control over electrical clearances during board layout. ![]() Making sure that there are safe clearances between objects on the PCB is a top priority.
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