3W Principle of PCB High-Speed Wiring

Topology and Timing Requirements:
Meeting the timing requirements is the key to the normal and stable operation of the system. The delay control reflected in the PCB design is the equal-length control of the traces. The equal-length winding has even become a term used by wiring engineers. Timing design is also a very complex system requirement. PCB design engineers must not only know the equal length, but also truly understand the timing requirements behind the equal length.

Cabling Requirements for Power and Power Signals:
The principle of filtering after protection should be done well in the power inlet circuit.

The pins of the chip and its filter capacitor should be as short and thick as possible, and the energy storage capacitor should be punched more to reduce the installation inductance caused by wiring.

Considering the safety requirements, when the voltage difference of the power network is large, it needs to be kept away, and the pins and vias of the high-voltage network plug-in need to be hollowed out.

Thermal Considerations in Routing:
There is also an important trend in electronic design, that is, the voltage drop and the power consumption increase. As an important part of the board thermal design, the PCB wiring becomes more important. When necessary, it is necessary to use relevant electrical and thermal simulation tools to assist in thermal design.

Strictly calculate the wiring channel to meet the current carrying requirements.

Also, pay attention to the current-carrying capacity of the vias, and plan the number and location of the vias reasonably.

If there is an empty position under the chip with high heat generation, copper can be added to the ground in a large area, and ground holes can be added to enhance heat dissipation.

In the projection area of ​​the device with high power and high heat generation, do not run high-speed lines and sensitive signal lines in all layers.

For high-current power supplies, if the wiring path is long, it is necessary to strengthen the wiring channel to reduce heat loss.

For heat-generating devices with heat-dissipating pads added, vias are added to the heat-dissipating pads to enhance heat dissipation.

PCB wiring is a systematic project. Design engineers need to have comprehensive knowledge of multiple disciplines, as well as strong analysis and processing capabilities. A good balance needs to be achieved in all aspects of integration.