Noise on the power supply: If it is a linear power supply, the first low frequency 50Hz is a serious source of interference. Since the primary incoming AC is inherently impure and is a sinusoidal wave of waves, it is easy to cause electromagnetic interference to the adjacent circuit, that is, electromagnetic noise. If it is a switching power supply, the noise is more serious, the switching power supply operates in a high frequency state, and there is a dirty harmonic voltage in the output portion, which can generate a large noise to the entire circuit.
Prevention method: Reasonable grounding, transmission of analog signals by differential structure, decoupling capacitors at the power supply output of the circuit, electromagnetic shielding technology, analog digital separation, bottom line on both sides of the signal line, ground isolation, etc.
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