Backdrilling PCB Technology
Backdrilling technology used in the semiconductor industry that ensures the highest fidelity signals can be carried at ever increasing speeds. This will ensure signal stubs are minimized; Stubs are the source of impedance discontinuities and signal reflections which become more critical as data rates increase. It is a preferred method in HS designs.
The advantages of the back drill via:
Reduce the use of buried blind holes, reduce the difficulty of PCB manufacturing that
is the role of the back drill?
The purpose of the back drill is to drill through a hole that does not have any connection or transmission to avoid reflection, scattering, delay of high-speed signal transmission. It is shown that the main factors that affect signal integrity of the signal system are that vias have a great influence on the signal integrity except for design, board material, transmission line, connector, chip package and so on.
The principle of back drill production working
When the drill bit is drilled, the drill tip touches the copper foil of the substrate board generates micro-current to sense the height of the board surface, and then drill down according to the set drilling depth. It will stop when reach drilling depth.
The process of back drill
What the features of back drill via PCB?
In PCB manufacture process, back drilling is 2nd drill operation that removes the unused plating in vias from a certain side to a certain depth.
Backdrilling prototype board
The major fabrication points of back drilling: