Basic knowledge of via and differential via design
Author:cj Time:2021-06-07 09:19 Browse(610)
Basic knowledge of via and differential via design, touch screen and OLED Forum
In a high-speed printed circuit board (PCB), through holes have been criticized for reducing the signal integrity performance.
however,

Basic knowledge of via and differential via design

the use of via holes is inevitable.
in standard PCB, components are placed on the top layer, However, the routing of differential pairs is in the inner layer.
the electromagnetic radiation and crosstalk between pairs in the inner layer are relatively low.
through holes must be used to connect the components on the circuit board plane with the inner layer.
fortunately.
a transparent through hole can be designed to minimize the impact on performance.
in order to reduce the impact on the circuit board performance, it is necessary to connect the components on the circuit board plane with the inner layer: m" \# A% T- M.
S# n: }, V( e0 r- z% E; Basic knowledge of via structure+ s* n, F$ Q' x    L& f5 t2 e2 c, y) }& Q* _ 2 O "P0] 3 [9 | let's start by examining the components connecting the top transmission line to the inner layer in the simple via.
Figure 1 is a 3D diagram showing the via structure.
there are four basic components: signal via, via stump, via pad and isolation pad.
$w9 j +? 3 x9 i7 F9 a: A7 u7 e; }( K$ k   _; AVias are metal cylinders plated outside the through holes between the top and bottom layers of the circuit board.
signal vias connect the transmission lines on different layers.
via stumps are unused parts on vias.
via pads are annular gaskets.
they connect vias to the top or internal transmission lines.
isolation pads are annular gaps in each power supply or ground plane.
in order to prevent power supply and grounding For more information about the short circuit of ground plane, please pay attention to the official website of jiepei www.jiepei.com/G156   x0 I: s" W& O- e6 ]& g,}; Y$ v' p6 x* I. f4 U) M- l! [ 5 A4 {.
pass by and help! No thanks.
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thank you
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