Mobile phone PCB digital ground and analog ground

阿_呆lw

Mobile phone PCB digital ground and analog ground [Copy link]

I heard from a senior who has been working in the industry for many years that now all mobile phones are made with a whole GND. I wonder if this is true.

懒猫爱飞

1) Although most of the circuits are digital, there are still various high-frequency and low-frequency signals. 2) There is no strong power input, and the ground is unified in theory. 3) However, some processing will be done between the signals, including ground.

bqgup

A whole ground? Analog ground and digital ground are usually separated, and there are some other grounds. Analog ground and digital ground are generally isolated with 0 ohm resistors to prevent interference. Mobile phones will not have the same ground.

Arvinˇ

The digital ground and analog ground should be separated, and then the two grounds should be connected together at one point.

topwon

For designers who know the reason, it is not impossible to use a whole ground. The key is to make relevant considerations during the component layout stage. Ensuring that the digital pulse ground return does not flow through the analog ground can avoid interference. Using a whole ground should be good for EMI. And there should not be many analog circuits in mobile phones.

qwqwqw2088

The PCB board of a mobile phone is generally around eight layers. Now drawing software is very powerful, and it is not a problem to make a board with more than ten layers. The density of the motherboard components is also very high. The interference of the RF chip of the mobile phone should be very sensitive, and the whole ground is very good for EMI.