Analysis of PCB design layout rate and design efficiency techniques

Analysis of PCB design layout rate and design efficiency techniques

Introduction: In PCB routing design, there is a complete set of methods to improve the layout rate. Here, we provide effective techniques for enhancing the layout rate and design efficiency of PCB design. These not only save the project development cycle for customers but also ensure the quality of the design product to the greatest extent.

Determine the number of layers of the PCB

The size of the circuit board and the number of wiring layers need to be determined at the initial stage of the design. If the design requires the use of high-density ball grid array (BGA) components, the minimum number of wiring layers needed for the wiring of these devices must be taken into consideration. The number of wiring layers and the stacking method will directly affect the wiring and impedance of the printed line. The size of the board helps determine the layering method and the width of the printing line, achieving the desired design effect.

For many years, people have always believed that the fewer layers a circuit board has, the lower its cost will be. However, there are many other factors that affect the manufacturing cost of circuit boards. In recent years, the cost differences among multi-layer boards have been significantly reduced. When starting the design, it is best to use a large number of circuit layers and ensure that the copper coating is evenly distributed to avoid discovering a small number of signals that do not meet the defined rules and space requirements near the end of the design, thus being forced to add new layers. Careful planning before design will reduce a lot of trouble in wiring.

2. Design rules and restrictions

The automatic wiring tool itself has no idea what it should do. To complete the wiring task, the wiring tools need to operate under the correct rules and constraints. Different signal lines have different wiring requirements. All signal lines with special requirements should be classified, and the classification varies with different designs. Each signal class should have a priority. The higher the priority, the stricter the rules. The rules involve the width of printed lines, the maximum number of vias, parallelism, the mutual influence between signal lines, and layer restrictions. These rules have a significant impact on the performance of routing tools. Carefully considering the design requirements is an important step towards successful wiring.