In addition, before the solder resistance film coating, the printed circuit board surface is treated by plasma, and a certain roughness and high activity surface can be obtained, so as to improve the adhesion of the solder resistance film.
Now the production of gold plate is rarely, in the actual trial process, 90% of the gold plate can be replaced by gold plate sinking gold plate, gold plate welding poor is his fatal shortage, is also the direct cause of Princecircuit to give up gold plate
The parasitic capacitance through the hole can cause the signal rise time to be prolonged and the transmission speed to be slowed down, thus deteriorating the signal quality.
It is difficult to use this process to control the production, so process engineers must adopt special flow and parameters to ensure the quality of the plug hole.
The chemical residue in the gold settling process can be left in the hole where the plug hole is not sufficient, causing problems such as weldability.
There is no significant relationship between the generation of bulge and construction area, the same area some severe, some light, some intact.
The advantage of performing reception equalization in standalone devices is that it provides optimal wiring advantage and design flexibility.
The current approach is to increase the distance between the two signal layers and make the lines of the two layers as vertical as possible to avoid signal crosstalk between layers.
The inner laser hole needs to be electroplated and filled, and then the outer laser hole is made. The price is more expensive than the error hole.
Shenzhen Princetron Circuit, as an innovative one-stop high-end electronic manufacturing services expert, will be committed to bring you more convenient experience, more intimate service and continuous innovation and progress!
In addition to the gold-plated copper foil at the lower left corner in the figure above, BGA packaging also uses the missing corner and concave points and silk screen dots to indicate the direction of the first foot.
This simple statement connects the common sense of capacitance with the newly discovered theory of characteristic impedance.