What are the common rules for PCB wiring?
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- Time of issue:2021-03-08
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(Summary description)PCB wiring refers to paving and repairing electrical signal roads to connect various components. In the PCB preset, wiring is a key step to complete the product preset. What are the common rules for PCB circuit board wiring
What are the common rules for PCB wiring?
(Summary description)PCB wiring refers to paving and repairing electrical signal roads to connect various components. In the PCB preset, wiring is a key step to complete the product preset.
What are the common rules for PCB circuit board wiring
- Categories:Company News
- Author:
- Origin:
- Time of issue:2021-03-08
- Views:
PCB wiring refers to paving and repairing electrical signal roads to connect various components. In the PCB preset, wiring is a key step to complete the product preset.
What are the common rules for PCB circuit board wiring
● 01 The direction control rule of the wiring
During PCB routing, the routing directions of adjacent layers are orthogonal to prevent different signal lines from walking in the same direction on adjacent layers to reduce the indispensable inter-layer tampering. When the PCB wiring is unavoidably exposed to parallel wiring, the simplest surface of the ground should be used to isolate the wiring layers, and the ground wire should be used to isolate the signal wires.
● 02 Open-loop inspection rules for wiring
In the PCB wiring, in order to prevent the "receiving antenna effect" arising from the wiring, reduce the indispensable interference radiation and collection, it is generally not allowed to expose the wiring method with one end floating.
● 03 Wiring length control rules
Try to keep the wiring length as short as possible in the preset to reduce the interference problem caused by the excessively long wiring. Regarding the situation of driving multiple components, it should be based on the specific situation to vote on which network topology to use.
● 04 Impedance-like matching rules
The wiring width of the same network should be kept exactly the same. Variations in the line width will cause the special characteristics of the line to be evenly warped. When the transmission speed is high, special circumstances will cause reflection. Under certain conditions, there may be no way to prevent the line width from changing, and every effort should be made to reduce the length of the half waist that is not exactly the same as the local effective length.
● 05 Chamfering rules
When PCB wiring, the corners of the wiring should be prevented from being preset to acute angles and 90-degree angles to avoid indispensable radiation; it is required that the angle between all wires and wires should be greater than or equal to 135°? In the wiring, it is indeed required to be 90 degrees. In the case of a degree-angle corner, two improvements can be taken: one is to turn the 90° corner into two 45° corners; the other is to use rounded corners as appropriate?
● 06 Component decoupling rules
An indispensable decoupling capacitor is added to the printed plate to filter out the interference signal on the power supply, so that the power signal is stable.
● 07 3W rule
In order to reduce the crosstalk between lines, the line spacing should be large enough. When the line core spacing is not less than 3 times the line width, 70% of the electric field can be maintained without mutual interference, which is called the 3W rule.
● 08 Ground wire loop rules
The smallest rule of the loop, that is, the size of the loop plane or the surface of the object formed by the signal line and its loop should be as small as possible. The smaller the loop plane or the surface of the object, the less the external radiation and the less the interference from the outside world.
● 09 Shielding try our best to take care of it
For a signal with a particularly high frequency, it is necessary to consider the problem and use the copper shaft cable shielding structure to preset it as it is appropriate. Separate the wires to be routed with ground wires on the left and right, and also think about how the problem works. Let the shielding ground It is joined to the simplest noodle tube in practice.
● 10 Resonance rules for traces
Mainly for high-frequency signal presets, that is, the length of the wiring cannot be in a flat relationship with its wavelength to avoid resonance.
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