The physical entity on which a circuit system depends is the PCB (Printed Circuit Board). The interconnection of components (including both electrical and mechanical connections) is realized through metallized traces on the surface of the dielectric or between dielectric layers, while traces on different layers are connected via electroplated vias.
The physical entity on which a circuit system depends is the PCB (Printed Circuit Board). The interconnection of components (including both electrical and mechanical connections) is realized through metallized traces on the surface of the dielectric or between dielectric layers, while traces on different layers are connected via electroplated vias.
Figure 1 Three-dimensional schematic diagram of a 6-layer PCB
In multilayer PCBs, especially high-speed PCBs, several metal layers (planes) between dielectrics are often allocated to power and ground (Power/Gnd) networks. Accordingly, the traces on the PCB can be roughly divided into two categories: microstrip lines and striplines.
A microstrip line has only one adjacent metal plane, and is usually located on the outer layers (Top/Bottom Layer) of the PCB. It can be further divided into surface microstrip lines and coated microstrip lines. The traces of a surface microstrip line are directly exposed to the air, while the trace surface of a coated microstrip line is covered with a layer of dielectric film.
A stripline is flanked by metal planes on both sides, which can effectively suppress electromagnetic radiation. According to the distance between the stripline and the two planes, it can be classified into symmetrical striplines and asymmetrical striplines, as shown in Figure 2.
Figure 2 Routing Types of High-Speed PCBs
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Figure 1 Three-dimensional schematic diagram of a 6-layer PCB
Figure 2 Routing Types of High-Speed PCBs