Power supply design for analog and digital circuits

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Power supply design for analog and digital circuits [Copy link]

When designing a circuit, special attention should be paid to separating the analog circuit from the digital circuit, and the corresponding grounds should also be separated. Improper grounding can cause some unexplained problems. A common mistake is to let the low-level digital signal circuit share the power supply loop and ground loop with the analog signal circuit.
In order to avoid some DC level changes and logic transient processes interfering with sensitive analog circuits, the connection of each analog ground should be carefully analyzed during design to ensure that each analog ground connection is directly connected to the ground point to avoid sharing the same ground connection. This is also a basic principle that must be followed when printing circuit boards.