Stacking Design Method of Balanced 开云·kaiyun官方网站 Boards

Stacking design Method of Balanced 开云·kaiyun官方网站 boards
Designers can design an odd 开云·kaiyun官方网站 If routing does not require additional layers, why use it? Won't reducing the number of layers make the board thinner? If there is one less circuit board, wouldn't the cost be lower? However, in some cases, adding a layer can actually reduce costs The circuit board has two different structures: core structure and foil structure In the core structure, all conductive layers in the circuit board are coated on the core material; In the foil structure, only the internal conductive layer of the circuit board is coated on the core material, and the external conductive layer is coated with the foil coated dielectrIC plate All conductive layers are bonded together by a multilayer lamination process using dielectrics The nuclear material is the factory's double-sided foil Because each core has two sides, when fully utilized, the number of conductive layers on the 开云·kaiyun官方网站 is uniform Why not use the foil on one side and use the core structure for the rest? The main reason is 开云·kaiyun官方网站 board and 开云·kaiyun官方网站 board
开云·kaiyun官方网站 board

Cost advantages of even laminates
Since there are fewer dielectric and foil layers, the raw material cost of odd 开云·kaiyun官方网站 is slightly lower than that of even 开云·kaiyun官方网站. However, the processing cost of odd 开云·kaiyun官方网站 is significantly higher than that of even 开云·kaiyun官方网站. The processing cost of the inner layer is the same; However, the foil/core structure significantly increases the processing cost of the outer layer. Singular layer 开云·kaiyun官方网站 needs to add non-standard laminated core layer welding process on the basis of core structure process. Compared with the core structure, the factory adding foil outside the core structure will lose productivity. Before laminated bonding, the outer core needs additional treatment, which increases the risk of scratches and etching errors in the outer layer.
Balanced structure to avoid bending
The reason why 开云·kaiyun官方网站 with odd layers is not designed is that odd layers are easy to bend. When the 开云·kaiyun官方网站 is cooLED after the multi-layer circuit bonding process, the different laminating tensions of the core structure and the foil covering structure will cause the 开云·kaiyun官方网站 to bend. As the thickness of the board increases, the risk of bending composite 开云·kaiyun官方网站 boards with two different structures increases. The key to eliminating board flex is balanced stacking. Although 开云·kaiyun官方网站 boards with a certain curvature meet the requirements of the specification, the subsequent processing efficiency will be reduced, resulting in additional costs. Due to the special equipment and process required for assembly, the accuracy of placement of this part will be reduced, thus affecting the quality.
Use evenly layered 开云·kaiyun官方网站s
When odd 开云·kaiyun官方网站 boards appear in the design, the following methods can be used to achieve balanced stacking, reduce 开云·kaiyun官方网站 manufacturing costs, and avoid 开云·kaiyun官方网站 bending. The following methods are listed in order of priority.
1) A signal layer and use. This method can be used if the power supply layer of the 开云·kaiyun官方网站 board is even and the signal layer is odd. The added layers will not increase the cost, but can shorten the lead time and improve the quality of 开云·kaiyun官方网站.
2) Add additional power layers. This method can be used if the power plane of the design 开云·kaiyun官方网站 is odd and the signal plane is even. A SIMple way is to add a formation in the middle of the stack without changing other settings. First, route the 开云·kaiyun官方网站 according to the odd number of layers, then copy the middle ground plane and MARK the remaining layers. This is the same as the electrical characteristics of the thickened foil.
3) Add a blank signal layer near the center of the 开云·kaiyun官方网站 stack. The method eliminates the stacking imbalance and improves the quality of 开云·kaiyun官方网站. First route the odd numbered layers, then add a blank signal layer and mark the remaining layers. It is used in microwave circuit and mixed medium (medium with different dielectric constant) circuit.
Advantages of balanced lamination 开云·kaiyun官方网站 board: low cost, not easy to bend, short delivery time, and guaranteed quality
The above is the explanation given by the editor of 开云·kaiyun官方网站 circuit board company. If you want to know more about 开云·kaiyun官方网站A, you can go to our company's home page to learn about it. In addition, our company also sells various circuit boards,
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