Do you know how to Place and Route PCB?

As a PCB Materials Company, share with you. At present, as PCB size requirements become smaller and smaller and device density requirements become higher and higher, the difficulty of PCB design gradually increases. How to shorten design time while ensuring quality? This requires engineers to have excellent technical knowledge and master some design skills.

1. Determine the number of Prototype PCB layers

The circuit board size and the number of wiring layers need to be determined early in the design. The number of wiring layers and the stacking method will directly affect the wiring and impedance of the printed wiring.

The size of the board helps determine the stacking method and the width of the printed line to achieve the desired design effect. At present, the cost difference between the multi-layer boards is very small. It is best to use more circuit layers and evenly distribute the copper when starting the design.

2. Design rules and restrictions

To successfully complete the wiring task, the wiring tool needs to work under the correct rules and restrictions. To classify all signal lines with special requirements, each signal class should have a priority. The higher the priority, the stricter the rules.

The rules relate to the width of the printed lines, the maximum number of vias, the parallelism, the mutual influence between the signal lines and the limitations of the layers. These rules have a great influence on the performance of the wiring tool. Careful consideration of design requirements is an important step in successful wiring.

3. Layout of components

In the optimization assembly process, manufacturability design rules will limit the component layout. If the assembly department allows the components to move, the circuit can be properly optimized to facilitate automatic wiring.

For example, for the layout of the power line: ① In the PCB layout, the power decoupling circuit should be designed near each related circuit, not placed in the power supply section, otherwise it will affect the bypass effect and will flow on the power line and the ground line. The pulsating current causes disturbance; ②For the power direction inside the circuit, power supply should be taken from the last stage to the previous stage, and the power supply filter capacitor of this part should be arranged near the last stage; ③ For some major current channels, such as during debugging and The current should be disconnected or measured during the detection process, and the current gap should be arranged on the printed wire during the layout. In addition, pay attention to the layout of the regulated power supply as far as possible on a separate printed board. When the power supply and the circuit use a printed board, in the layout, it should avoid mixing the regulated power supply and the circuit components or make the power supply and the circuit use the ground wire. Because this kind of wiring is not only easy to cause interference, but also can not disconnect the load during maintenance, then only part of the printed wire can be cut, which damages the printed board.

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