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Although semiconductor integration is higher and higher, many applications on chip system can be obtained at any time, also many powerful development board became available

by:Rigao      2020-03-30
This article introduces a few golden rules of PCB design, and is widely used in all kinds of PCB design projects. This paper introduces the electronic design engineer in the use of design software for printed circuit board layout design and commercial manufacturing should be kept in mind and practice of article 10 of the most effective design rules. Engineers don't need according to the time or the relative importance in order to implement these rules, just follow they can significantly alter the product design. Rule one: choose the right set of grid, and always use with most component matching grid spacing. Although multiple grid ( multigrid) Seems to be effective, but if engineers can in the early stages of printed circuit board layout design more thinking, they can avoid the difficulty in space, and can maximize the application of circuit board. Due to the many devices have a variety of package sizes, engineers should use the most favourable design products. In addition, the polygon for the copper plating on the circuit board is very important. Many circuit board copper plating on polygon, often produce polygon fill the deviation. Although it is not based on a single grid, it can provide live a longer life expectancy than required circuit board to use. Rule 2: keep the shortest path and direct this sounds simple and common, but in each stage should keep in mind, even if this means changing the PCB layout to optimize the wire length. This is especially applicable to simulation and high-speed digital circuit, the system performance is always part of the impedance and the limitation of the parasitic effects. Three rules: as far as possible use of the power supply layer to manage the distribution of power and ground for most of the PCB design software, the power level of the copper coating is a faster, more simple choice. Through mutual connection of wires and can assure you with the highest efficiency and the lowest current impedance or voltage drop, at the same time can provide adequate ground loop. If possible, can also be run in the same area in the circuit board more than the power cord, to confirm whether the ground layer covering most of printed circuit board stratification, which is beneficial to the interaction between adjacent layer on the paths. Rule four: with the requirements of the test point for grouping related parts, for example, OpAmp operational amplifier for discrete component close to the device is placed, so that the bypass capacitor and resistor can communicate and coordinate with the same to help optimize rule 2 mentioned in wiring length, at the same time make it easier to test and fault detection. Rule 5: in another larger PCB circuit board needed for repeat many times for printed circuit board layout equipment used for manufacturers to select the most appropriate size will help decrease the cost of prototype design and manufacturing. First of all, on the front panel circuit board layout, contact circuit board manufacturers to obtain the size of choice for each panel, and then modify your design specifications, within those panel size and try to repeat your design several times. Rule 6: integration of component values as a designer, you will choose to have high or low but the performance of the same component values of discrete components. Through consolidation in smaller standard scope, can simplify the bom, reduce the cost. If you have a series of value based on the preferred device of polychlorinated biphenyls (PCBS) products, in the long run, making the right inventory management decision making will be more helpful. Rule seven: perform design rule checking as much as possible while in the printed circuit board software running on digital copyright control functions only need a very short time, but in a more complex design environment, as long as always perform inspection in the process of design, can save a lot of time, this is a worth keeping good habits. Each routing decisions is important, you can at any time by performing one of the most important routing message for DRC. Rule eight: flexible use of screen printing screen printing can be used to tag a variety of useful information, for circuit board manufacturers, service, or test engineer, installation personnel or equipment debugging personnel to use in the future. Not only marks a clear function and test point label, and as much as possible to mark the direction of the components and connectors, even the annotation of printed circuit boards using components under the surface ( After the circuit board assembly) On the surface of circuit boards up and down fully application of screen printing technology can reduce the repeated work, simplify the production process. Rule 9: need decoupling capacitor don't trying to avoid the power cord decoupling and according to component data manual limits to optimize design of capacitor is cheap and durable. You can spend as much time to assemble the capacitor. At the same time, to follow the rules 6 and use standard range to maintain a clean and tidy inventory. Rule 10: printed circuit board manufacturing parameters and validated before submitting the production even though most of the circuit board manufacturers willing to directly download and verify for you, but you'd better output Gerber file first, and then use free viewer to check, in order to avoid misunderstanding. Through personal verification, you will find that even some careless mistakes, avoiding the caused by the parameters of the complete production according to the error of the loss. As the circuit design is more and more widely Shared, internal team is more and more dependent on the reference design, and the basic rules of the similar will be is still a feature of PCB design, we think it is very important for PCB design. By illustrating the basic rules, developers can very flexible to improve the value of their products, and gain maximum benefit from their circuit board manufacturing. Even the novice PCB designer can remember these basic rules to speed up the learning process, enhance self-confidence.
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