I. Drawing process of four-layer PCB board:

1. Draw circuit schematic diagram and generate network table.

The process of drawing schematic diagram involves the drawing of components and packaging drawing, mastering these two drawing schematic diagram is basically no problem. To eliminate errors and warnings, general problems should be resolved. Complex schematics can be drawn using hierarchical schematics.

The shortcut keys used here: CTRL+G (to set the spacing between the network tables), CTRL+M(to measure the distance between two points)

2. Plan the circuit board

How many layers should I draw? Do you place components on one side or on two? What is the size of the circuit board? , etc.

3. Set various parameters

Layout parameters, board layer parameters, basically according to the system default, only need to set a small number of parameters.

4. Load network table and component package

Design -> Update PCB Document USB.PcbDoc

Note: If there is an error during schematic drawing, but the PCB layout has been completed, and you want to correct the error without affecting the PCB layout, you can also do this step, but do not check the Add in front of the last item of Add ROOMS!! Otherwise it will be rearranged, that is painful!!

Network table is the interface between the circuit schematic diagram editing software and the PRINTED circuit board PCB design software, only after loading the network table, can do automatic wiring to the circuit board.

5. Layout of components

In most cases, the layout is manual, or a combination of automatic and manual.

If you want to place the component on both sides: select the component and press the left mouse button, then press L; Or click the component on the PCB interface and change its property to the bottom layer.

Note:

Uniform discharge of components for installation, plug-in and welding operations. The text is placed in the current character layer, the position is reasonable, pay attention to the orientation, avoid being blocked, easy to produce.

6 and the wiring

Automatic wiring, manual wiring (before wiring should be planned layout, with the inner electrical layer, and first hide the inner electrical layer for wiring, the inner electrical layer is usually the whole piece of copper film, and copper film with the same network name of the pad through the inner electrical layer when the system will automatically connect it with the copper film, The form of connection between pads/holes and the internal electrical layer, as well as the copper film and other pads not part of the network, and the safe spacing can be set in the rules.