Process Analysis of Multilayer PCB Design
One of the main purposes of the design of the circuit schematic is to provide a netlist for PCB design, and to prepare the basis for the design of the PCB board.
The process of multilayer PCB design is basically the same as the design steps of ordinary PCB boards. The difference is that the routing of the intermediate signal layer and the division of the inner electrical layer are required. On the whole, the multilayer PCB design is basically divided into the following step. This article first briefly introduces these steps.
1. Circuit board planning
The main thing is to plan the physical size of the PCB board, the package form of the component, the component installation method, and the layer structure, that is, single-layer board, double-layer board and multi-layer board.
2. Working parameter settings for multilayer PCB design
It mainly refers to the working environment parameter setting and the working layer parameter setting. Setting the PCB environmental parameters correctly and reasonably can bring great convenience to the multilayer PCB board design and improve work efficiency.
3. Component layout and adjustment of multilayer PCB design
After the preparatory work is ready, you can import the netlist into the PCB, or you can directly import the netlist by updating the PCB in the schematic diagram. Component layout and adjustment are relatively important tasks in the multilayer PCB design, which directly affect operations such as the subsequent wiring and the division of internal electrical layers.
4. Definition and setting of the middle layer of multilayer PCB design
The focus of this operation is to set up a specific layer structure in the software layer stack manager, mainly setting the number of intermediate signal layers and internal electrical layers, upper and lower structures, etc.
5. Internal electrical layer segmentation in multilayer PCB design
Usually, the internal power layer often has more than one power supply network. It is often necessary to divide the internal power supply layer into several isolated areas and connect each area to a specific power supply network, which is the biggest difference between a multilayer board and an ordinary board. It is also an important link in the multilayer PCB design. The structure of the internal electrical layer division often directly affects the wiring of the power supply and the ground grid, and is also affected by the component layout and wiring.
6. Multilayer PCB design and wiring rules setting
It mainly refers to set various specifications of circuit wiring, wire width, parallel line spacing, safety spacing between wires and pads, and via size, etc., no matter what wiring method is adopted, wiring rules are an indispensable step. Good wiring rules can ensure the safety of the circuit board wiring, and meet the requirements of the manufacturing process, saving costs.