How to design the vias in high-speed PCBs to be reasonable?

Through the analysis of the parasitic characteristics of vias, we can see that in high-speed PCB design, seemingly simple vias often bring great negative effects to circuit design. In order to reduce the adverse effects caused by the parasitic effects of the vias, the following can be done in the design:

ipcb

1. Considering the cost and signal quality, choose a reasonable size via size. For example, for the 6-10 layer memory module PCB design, it is better to use 10/20Mil (drilled/pad) vias. For some high-density small-size boards, you can also try to use 8/18Mil. hole. Under current technical conditions, it is difficult to use smaller vias. For power or ground vias, you can consider using a larger size to reduce impedance.

2. The two formulas discussed above can be concluded that using a thinner PCB is beneficial to reduce the two parasitic parameters of the via.

3. Leka hore u se ke ua fetola mekhahlelo ea matšoao a letšoao ho PCB boto, ke hore, leka ho se sebelise vias tse sa hlokahaleng.

4. Matla le lithapo tsa fatše li lokela ho phunngoa haufi le moo, ‘me moetapele pakeng tsa via le pin e lokela ho ba khutšoanyane ka hohle kamoo ho ka khonehang, hobane ba tla eketsa inductance. Ka nako e ts’oanang, matla le lisebelisoa tsa fatše li lokela ho ba tse teteaneng ka hohle kamoo ho ka khonehang ho fokotsa impedance.

5. Beha ba bang vias thehiloeng haufi le vias lera pontšo ho fana ka le haufi lupu bakeng sa pontšo. Hoa khoneha ho beha palo e kholo ea li-vias tse sa hlokahaleng holim’a boto ea PCB. Ha e le hantle, moralo o hloka ho fetoha habonolo. Mohlala o boletsoeng pejana ke moo ho nang le li-pads holim’a sekhahla se seng le se seng. Ka linako tse ling, re ka fokotsa kapa ra tlosa liphaephe tsa likarolo tse ling. Haholo-holo ha segokanyipalo sa vias ke phahameng haholo, ho ka ‘na lebisa ho sebopeho sa khefu groove hore arola lupu ka lera koporo. Ho rarolla bothata bona, ntle le ho tsamaisa boemo ba via, re ka boela ra nahana ka ho beha via ka lera koporo. Sekhahla sa patsi se fokotsehile.