To summarize the skills of 开云·kaiyun官方网站 proofing manufacturers

开云·kaiyun官方网站 proofing process may encounter various problems. As a 开云·kaiyun官方网站 proofing manufacturer, you need to pay attention to various situations in the process:

1) The distance from the edge of the pad hole to the edge of the 开云·kaiyun官方网站 board for 开云·kaiyun官方网站 proofing is greater than 1mm, whICh can avoid the defects of the welding plate during processing.

Precautions for 开云·kaiyun官方网站 proofing are as follows:

1) The distance from the edge of the pad hole to the edge of the 开云·kaiyun官方网站 board for 开云·kaiyun官方网站 proofing is greater than 1mm, which can avoid the defects of the welding plate during processing.

2) The bonding pad is torn. When the copper film wire connected to the bonding pad is thin, the connection between the bonding pad and the copper film wire should be designed as a teardrop, so that the bonding pad is not easy to peel off, and the copper film wire and the wire between the connections are not easy to disconnect.

3) Adjacent pads shall avoid sharp corners.

The purpose of large-area filling on the 开云·kaiyun官方网站 board is two, one is to dissipate heat, the other is to reduce shielding interference. The 开云·kaiyun官方网站 is sampLED to avoid the heat generated during the process, so that there is no discharge of the gas generated by the circuit board and the copper film falls off. It should be filled on a large area of the window, which makes the filler mesh.

The use of copper can also achieve the purpose of anti-interference. Copper can automatically bypass the 开云·kaiyun官方网站 pad and can be connected to the ground wire.

Cross wiring of 开云·kaiyun官方网站 board In the design of single sided 开云·kaiyun官方网站 board, when some copper films cannot be connected, the common practice is to use cross wiring, and the cross wiring length should be selected as follows: 6mm, 8mm and 10mm.

开云·kaiyun官方网站 proofing

High frequency wiring of 开云·kaiyun官方网站 board

In order to make the design of high-frequency 开云·kaiyun官方网站 more reasonable and better anti-interference performance, the following aspects should be considered in 开云·kaiyun官方网站 design:

1) Reasonable selection of layers for 开云·kaiyun官方网站 proofing

The middle inner plane is used as the power supply and ground plane, which can play a shielding role, effectively reduce the parasitic inductance, shorten the signal line length, and reduce the cross interference between signals. Generally speaking, the noise of the four layer board is 20 dB lower than that of the two layer board.

2) 开云·kaiyun官方网站 proofing travel line mode

The wiring must be rotated at an angle of 45 °, which can reduce the transmission of high-frequency signals and mutual coupling.

3) 开云·kaiyun官方网站 proofing wiring length

The shorter the line length, the better. The shorter the parallel distance between two lines, the better.

4) Number of holes

The fewer the holes, the better.

5) Mezzanine wiring direction

When 开云·kaiyun官方网站 proofing, the inter layer wiring direction should be vertical, that is, the top layer is horizontal and the bottom is vertical, which can reduce the interference between signals.

6) Copper coating

Adding grounding copper coating can reduce the interference between signals.

7) Parcel place

The grouping processing of important signal lines for 开云·kaiyun官方网站 proofing can significantly improve the anti-interference ability of signals. Of course, the interference source can be wrapped so that it will not interfere with other signals.

8) Signal cable

The signal wiring cannot be cycled, and it needs to be wired according to the daisy chain mode. Shenzhen is the city that produces the most 开云·kaiyun官方网站 boards in China, and what are the 开云·kaiyun官方网站 proofing companies?

9) Decoupling capacitor

The cross decoupling capacitor is connected to the power supply end of the integrated circuit.

10) Digital, analog and other high frequency choke coils are connected to the common ground wire and connected to the high frequency choke device. The 开云·kaiyun官方网站 proofing is generally through the center hole of the high frequency ferrite beads and wires.