Redesign A/D Converter PCB Board Wiring Schematic and eliminate the noise of the digital code output by the A/D converter can be attributed to the noise of the op amp and the lack of anti-aliasing filters.
Redesign A/D Converter PCB Board Wiring Schematic
If there is a “minimum” amount of digital circuits in the printed circuit board schematic redesign, you may only need a ground plane and a power plane. “Minimum” can be defined by the PCB board designer.
The danger of connecting digital and analog ground planes together is that the analog circuit will introduce noise from the power supply pins and couple the noise into the signal path.
At one or more points of the circuit, the ground and power supply of the analog circuit and digital circuit should be connected together to ensure that the power supply, input and output of all devices share the same ground and their nominal value will not be destroyed.
In a 12-bit system, the power plane is not as important as the ground plane.
Although the power plane can solve many problems, making the power line twice or three times wider than other traces on the circuit board and effectively using bypass capacitors can reduce the noise of the power supply.
