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PCB circuit board structure description
Mar 27, 2018

First, the printed circuit board is mainly composed of pads, vias, mounting holes, wires, components, connectors, fillers, electrical boundaries, etc. The main functions of each component are as follows:

 

Pads: Metal holes used to solder component pins.

 

Via: Metal hole used to connect component pins between layers.

 

Mounting hole: Used to fix the printed circuit board.

 

Conductor: An electrical network copper film used to connect component pins.

 

Connectors: Components used to connect between circuit boards.

 

Fill: The copper used for the ground network can effectively reduce the impedance.

 

Electrical Boundary: Used to determine the size of the circuit board. Components on all circuit boards must not exceed this boundary.

 

Second, the common laminar structure of the printed circuit board includes Single Layer PCB, Double Layer PCB and Multi Layer PCB. A brief description of the three layer structures is as follows: :

 

(1) Single-layer boards: Circuit boards that have only one side of copper and no copper on the other side. The components are usually placed on the side that is not covered with copper, and the copper side is used for wiring and soldering.

 

(2) Double-layer board: This is a circuit board with copper on both sides. It is usually called a top layer on one side and a bottom layer on the other side. The top layer is generally used as the placement component surface, and the bottom layer is used as the component welding surface.

 

(3) Multilayer board: It refers to a circuit board that includes multiple working planes. Besides the top layer and the bottom layer, it also contains several intermediate layers. Generally, the middle layer can be used as a wire layer, a signal layer, a power layer, a ground layer, and the like. The layers are insulated from each other, and the layers are usually connected by vias.

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