First: preparation.

This includes preparing component libraries and schematics. “To do good work, must first sharpen its device”, to make a good board, in addition to the principle of good design, but also draw well. Before PCB design, the component library of schematic SCH and the component library of PCB should be prepared first. Peotel libraries can be used, but in general it is difficult to find a suitable library, it is best to make your own library according to the standard size information of the selected device. In principle, make PCB component library first, and then SCH component library. PCB component library requirements are high, it directly affects the board installation; SCH’s component library requirements are relatively loose, as long as attention is paid to the definition of pin attributes and the corresponding relationship with PCB components. PS: Note the hidden pins in the standard library. Then is the schematic design, ready to do PCB design.

Second: PCB structural design.

In this step, according to the circuit board size and mechanical positioning, PCB board surface is drawn in the PCB design environment, and connectors, buttons/switches, screw holes, assembly holes and so on are placed according to positioning requirements. And fully consider and determine the wiring area and non-wiring area (such as how much of the screw hole around the non-wiring area).

Third: PCB layout. Layout is basically putting devices on a board. At this point, if all the preparatory work mentioned above is done, you can generate the Design- CreateNetlist on the schematic, and then import the network table Design- LoadNets on the PCB diagram. See the device hubbub of the whole pile up, between the pins and fly line prompt connection. You can then lay out the device. The general layout is carried out according to the following principles:

How to draw PCB board in PCB design environment

(1). According to the electrical performance reasonable partition, generally divided into: digital circuit area (that is, afraid of interference, and interference), analog circuit area

(fear of interference), power drive area (interference source);

(2). Complete the same function of the circuit, should be placed as close as possible, and adjust the components to ensure the most simple connection; At the same time, adjust the relative position between the functional blocks to make the connection between the functional blocks the most concise.