5/2/2023 0 Comments Avr analog ground![]() Ground division and tandem: Grounding is one of the important means to suppress electromagnetic interference and improve the EMC performance of Electronic equipment. Theoretically speaking, the ground is at zero voltage, but on the actual PCBA, there is a lot of noise and bounce on the ground. ![]() In short, the logical connection characteristics of the ground and the physical characteristics on the PCB are to be distinguished. It should be handled according to the application and ESD requirements. Sometimes the circuit ground is connected to the housing through a 1M resistor, sometimes directly. The earth generally refers to the case, and this part is required for ESD and shielding. Even if it is a digital circuit with the same power supply, there are sometimes wiring requirements, such as the ground of the IO part with a large current, which may need to be handled separately. This is mainly based on the performance of the circuit to divide the ground, for the digital signal 3.3v circuit, 2.5V circuit and 5V circuit ground may also have a separate need. The power ground cannot be regarded as an analog ground, and the signal ground cannot be regarded as a digital ground. ![]() The separation of ground is mainly from the perspective of wiring to reduce the interference between different circuits. In engineering design, from the point of view of reference level, they are all the same ground, and eventually they must be connected together to obtain the same reference potential. ![]()
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