Introduction of PCB Vias & PCB Holes
1 Via design in high speed PCB
In high-speed PCB design, multi-layer PCBs a r e often required. H0wever, vias are an important factor in multilayer PCB design.
The via holes in the PCB a r e mainly composed of a hole, a pad area around the hole, and a POWER layer isolation area.
Today, let’s talk about the vias of PCB and design requirements for vias in high-speed PCBs.
In high-speed PCB multi-layer boards,signals a r e transmitted from one layer of interconnect to another
and via vias a r e required to connect. And also,when the frequency is lower than 1 GHz, the via can play a good connection,
However, when the frequency is higher than 1 GHz, the influence of the parasitic effect of the via on the signal integrity can not be ignored.
At this time, the via appears as a discontinuous breakpoint on the transmission path
which will cause signal reflection, delay, and attenuation. Signal integrity problem
2 Type of vias
Blind hole: refers to the top and bottom of the printed circuit board
with a certain depth for the connection between the outer line and the inner line
The depth and aperture of the hole usually do not exceed a certain ratio.
Buried hole: refers to the connection hole located in the inner layer of the printed circuit board
which does not extend to the surface of the circuit board.
Through Hole: This type hole passes through the entire circuit board
and can be used to implement internal interconnections or as mounting holes for components
Since the through holes are easier to implement in the process and the cost is lower,
In general, almost all printed circuit boards have through holes
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is a professional and trusted pcb manufacturer in Shenzhen, China, specialises in multilayer pcb, HDI pcb, and rigid-flex pcb