Basic flow of PCB design

One of the main purposes of circuit schematic design is to provide a network list for the design of pcb, and to prepare for the design of PCB.
The design process of multi-layer pcb is basically the same as that of ordinary PCB, but the difference is that the wiring of the intermediate signal layer and the division of the internal electrical layer need to be carried out. Generally speaking, the design of multi-layer PCB is basically divided into the following steps. Firstly, this paper briefly introduces these steps.
The planning of circuit board is mainly to plan the physical size of pcb, the packaging form of components, the installation mode of components and the layer structure, that is, single-layer, double-layer and multi-layer boards.
Working parameter setting mainly refers to working environment parameter setting and working layer parameter setting. Reasonable setting of pcb environmental parameters can bring great convenience to the design of PCB and improve work efficiency.
Component layout and adjustment, when the preliminary work is accurate, the network list can be imported into the pcb, or the network list can be imported directly by updating the pcb in the schematic diagram. Readers who have used protel dxp know that the system comes with the function of automatic layout. However, the effect of automatic layout is often not ideal. Generally, manual layout should be adopted, especially for complex circuits and components with special requirements. The layout and adjustment of components is an important work in pcb design, which directly affects the following operations such as wiring and the division of internal electrical layers.
The definition and setting of PCB intermediate layer, this operation focuses on setting the specific layer structure in the layer stack manager of software, mainly setting the number of intermediate signal layers and internal electrical layers, upper and lower structures, etc.
Internal layer division, usually internal 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. This is the biggest difference between multilayer boards and ordinary boards, and it is also an important link in the design of multilayer circuit boards. The structure of internal layer division often directly affects the wiring of power supply and ground grid, and is also affected by the layout and wiring of components.
The setting of wiring rules is mainly to set various specifications of circuit wiring, such as wire width, parallel line spacing, safe spacing between wires and pads, and via hole size, etc. No matter what kind of wiring method is adopted, wiring rules are an essential step. Good wiring rules can ensure the safety of circuit board wiring, meet the requirements of manufacturing process, and save costs.
With wiring adjustment, the system provides automatic wiring, but it often can’t meet the requirements of designers. In practice, designers often rely on manual wiring, or some automatic wiring combined with manual interactive wiring to complete the wiring. Special attention should be paid to layout and wiring, and PCB circuit board has the characteristic of internal electrical layer. Although layout and wiring are in order, in design engineering, the layout of circuit board is often adjusted according to the need of wiring and internal electrical layer division, or wiring is adjusted according to layout. They are a process of mutual consideration and mutual adjustment.
Other auxiliary operations, such as copper plating and tear filling, as well as document processing such as report output, saving and printing, can be used to check and modify PCB, and can also be used as a list of purchased components. Please contact customer service for pcb design project.