Ten Practical Rules of PCB Circuit Board Design Analysis
Rule 1: Choose the exact grid settings and always use the grid spacing that can match the most components. While multiple grids may seem obvious, but engineers can avoid frustration when setting distances and maximize the application of the board if they can think more about it in the early stages of PCB layout design. Because many devices are used in a variety of package sizes, engineers should use the most conducive to their own design of the product. In addition, the polygon is critical to the circuit board copper, multi-grid circuit boards in the polygonal copper polygonal filling deviation generally occurs, although not as based on a single grid so scale, but can provide more than the required life of the board.
Rule 2: Keep the path shortest and most direct. This may sound simplistic, but it should be kept in mind at every stage, even if it means altering the board layout to optimize the length of the wiring. This point is also particularly applicable to system performance is always sector limited by impedance and parasitic effects of analog and high-speed digital circuits.
Rule 3: As far as possible to use the power layer to govern the distribution of power and ground lines. Copper laying on the power supply layer is a faster and simpler option for most PCB circuit design software. By sharing a large number of wires, it ensures that the highest efficiency current with the lowest impedance or voltage drop is available, while providing an adequate ground return path. If possible, run multiple power lines in a uniform area of the board to verify that the grounding layer covers most of the PCB layer, which facilitates interaction between lines running on adjacent layers.
Rule 4: Group related components together with the required test points. For example, the OpAmp operational amplifier discrete components required to be placed closer to the device so that the bypass capacitors and resistors can work with them in the same place, thus helping to optimize the length of the wiring referred to in Rule 2, but also to make the test and fault detection easier.
Rule 5: Repeat the PCB routing by duplicating the required board several times on another, larger board. Select the size that best fits the equipment used by the manufacturer to help reduce the cost of prototyping and manufacturing. Start with a circuit board layout at panel length, contact the circuit board manufacturer for their preferred size specifications for each panel, then modify your design specifications and do your best to repeat your design many times within those panel sizes.
Rule 6: Integrate component values. As a designer, you will choose discrete components that have either high or low component values, but the same effectiveness. By consolidating within a smaller range of scale values, you can simplify your bill of materials and potentially reduce cost. If you have a range of PCB circuit board products based on preferred device values, it is also better for you to make accurate inventory management decisions in the longer term.
Rule 7: Perform as many design rule checks (DRCs) as possible. While running the DRC function on your PCB software takes a short amount of time, in more complex design environments you can save a lot of time by always performing the checks during the design process, which is a good habit to keep. Every wiring decision is pivotal, and by performing a DRC you can always be reminded of the most important ones.
Rule 8: Be flexible with screen printing. Screen printing can be used to label a variety of useful information for future use by board builders, service or test engineers, installation staff, or equipment commissioning staff. Not only clearly marked function and test point labeling, but also as far as possible to indicate the direction of the components and connectors, even if these notes will be printed on the board used in the lower surface of the components (after the board is assembled). In the board on the upper and lower surfaces of the full application of screen printing technology can reduce duplication of work and streamline the production process.
Rule 9:Always use decoupling capacitors. Don't try to optimize your design by avoiding decoupling power lines and relying on the limits in the component datasheets. Capacitors are inexpensive and robust, and you can take as much time as you need to put them together while following Rule 6 and using a range of scale values to keep your inventory tidy.
Law 10: Born PCB circuit board manufacturing parameters and verify them before submitting them for production. While most board manufacturers are excited and willing to download and verify for you directly, it's still best to output the Gerber file yourself and check with a free viewer that it's as expected to avoid misinterpretation. By verifying it firsthand, you may even find some inadvertent errors and thus avoid losses by completing the output according to the wrong parameters.
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