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Use the role of the ground layer:
2019-09-09 11:47:58
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When it comes to PCB, many friends will think that it can be seen everywhere around us, from all kinds of household appliances, computer accessories, to all kinds of digital products, as long as electronic products almost all use PCB, then what is PCB? PCB is printed circuit board, that is, printed circuit board, for electronic components to insert, with circuit base plate. The copper plated substrate is printed with anti-corrosion circuit by printing, and then etched to wash out the circuit.

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Use the role of the ground layer:
Adding grounding layers to PCB is a very simple, low-cost, and efficient way to design electronic devices with better signal integrity, higher accuracy, and stronger interference resistance.If you are not comfortable , be sure to keep these benefits in mind when laying out the next PCB.

How is the difference distribution line realized?

Two points should be paid attention to in the wiring of differential pairs. One is that the length of the two lines should be as long as possible. The other is that the distance between the two lines (which is determined by the differential impedance) should always remain unchanged, that is, to keep parallel. There are two ways of parallel: one is that two lines run on the same side by side, and the other is that two lines run on two adjacent layers (over under). Generally, there are many ways to implement the former side by side.

For a clock signal line with only one output, how to realize the difference distribution line?

Only when the difference distribution line is used is the signal source and receiver are also differential signals. Therefore, the difference distribution line cannot be used for clock signal with only one output.

Can a matching resistance be added between the differential pairs at the receiving end?

The matching resistance between differential pairs at the receiving end is usually added, and its value should be equal to the value of differential impedance. So the signal quality will be better.

Why do differential pair routing be close and parallel?

The routing of differential pairs should be appropriately close and parallel. The so-called appropriate approach is because the distance will affect the value of differential impedance, which is an important parameter in the design of differential pairs. Parallel is also necessary because of the consistency of differential impedance. If the two lines are far or near, the differential impedance will be inconsistent, which will affect the signal integrity and timing delay.


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