PCB Avoid Bending
When odd PCB layers appear in the design, the following methods can be used to achieve balanced lamination, reduce PCB manufacturing cost, and avoid PCB bending. The following methods are arranged in order of preference.
1. One layer of signal layer and use. This method can be used if the power supply layer of the PCB is even and the signal layer is odd. The added layer does not increase the cost, but it can shorten the delivery time and improve the PCB quality.
2. Add an additional power layer. This method can be used if the power supply layer of the design PCB is odd and the signal layer is even. A simple method is to add a layer in the middle of the stack without changing other settings. First, wire according to the odd number of PCB layers, then copy the layers in the middle, and mark the remaining layers. This is the same as the electrical characteristics of the thickened layer foil.
3. Add a blank signal layer near the center of the PCB stack. This method minimizes stack imbalance and improves PCB quality. First, wire according to the odd number of layers, then add a blank signal layer and mark the remaining layers. It is used in microwave circuit and mixed medium circuit (the medium has different dielectric constant).
Advantages of balanced laminated PCB: low cost, not easy to bend, shorten delivery time, and ensure quality.