Contact Us
Blog >> Blog Details Page

How to improve EMC compatibility of single/double sided PCB

Posted:10:13 AM January 31, 2018 writer: G

The main reason for this phenomenon is because the signal loop area is too large, not only produced strong electromagnetic radiation but also make the circuit sensitive to external interference. The easiest way to improve the electromagnetic compatibility of a line is to reduce the loop area of critical signals.

The key signal: 

From the electromagnetic compatibility point of view, the key signal mainly refers to produce strong radiation signals and sensitivity to the outside world. Signals that produce strong radiation are typically periodic signals, such as low-level signals of clocks or addresses. Signal that is sensitive to interference refers to those analog signals with low levels.

Reduce the area of the circuit method:

A simple way is to lay a ground wire on the edge of the critical signal line, which should be as close as possible to the signal line. This results in a smaller loop area, reducing the sensitivity of differential mode radiation to outside interference. When a ground line is added next to a signal line, a loop of the smallest area is formed, and the signal current will certainly pass-through this loop, not the other ground path.

If it is a double-sided circuit board, you can place a ground wire along the signal line on the other side of the circuit board, just under the signal line, and try to make the line as wide as possible. The loop area thus formed is equal to the thickness of the board multiplied by the length of the signal line.

In addition, the double-decker board should use the ground grid without exception to reduce the impedance of the ground. When using a ground grid, there is always a ground adjacent to the signal line, forming a smaller loop area. And in the wiring, should try to make the key line near the ground. Only for particularly critical lines (which produce very strong radiation or are particularly sensitive). Just need to set the ground line close to the signal line.

 

Tag: EMC compatibility PCB EMC
  • PCB
    Prototype
  • PCB
    Assembly
  • SMD
    Stencil

Dimensions: (mm)

×

Quantity: (pcs)

5
5
10
15
20
25
30
40
50
75
100
120
150
200
250
300
350
400
450
500
600
700
800
900
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
6000
6500
7000
7500
8000
9000
10000

Other Quantities:(quantity*length*width is greater than 10㎡)

OK

Layers:

Thickness:

Quote now