What is Design Rule
A design rule in the PCB industry refers to a set of guidelines or constraints that are implemented during the PCB design process to ensure that the design meets specific requirements and can be easily manufactured. These rules cover various aspects of the design, including electrical properties, physical attributes, and spacing requirements.
Electrical design rules focus on factors such as impedance, voltage, and other electrical properties. They ensure proper signal integrity and functionality by specifying parameters like trace lengths, matching trace lengths within differential pairs, and defining routing patterns for different types of signals. These rules help optimize the electrical performance of the PCB design.
Physical design rules, on the other hand, are related to factors like trace width, via sizes, and differential pairings. They dictate the physical layout and routing of the PCB, ensuring proper spacing and alignment of components and traces. Physical design rules help prevent conflicts, collisions, and other issues that may arise during manufacturing and assembly.
Spacing design rules are associated with high-voltage power track spacing and clearance. They define the minimum distance required between high-voltage tracks to ensure safety and prevent electrical arcing or short circuits.
By adhering to design rules, PCB designers can optimize the functionality, manufacturability, and reliability of their designs. These rules act as a boundary or limit, preventing the design from going beyond certain specifications or capabilities. Design rules also enable designers to utilize advanced technologies while still ensuring compliance with necessary constraints.