ywguo
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Vijay,
Paul has propose the two basic rule. In general, how to assign power supply and ground depends many factors including the requirement on performance, the topology of the circuit, the available pin resources, and so on.
If possible, provide one clean (seperate) ground to analog circuit or as the guard ring for analog circuit. For some very sensitive design, assign a seperate ground for bulk of the digital circuits to prevent the substrate from pollution.
Best regards, Yawei
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