source:Other information release time:2023-04-10 Hits: Popular:PCB Assembly company
Answer: In order to ensure that the design performance reaches the technical specifications of the data manual, some guidance principles must be observed. First of all, there is a common question: "Should Agnd and DGND ground floor be separated?" The simple answer is: depends on the situation.
The detailed answer is: usually not separated. Because in most cases, the separation ground layer will only increase the inductance of returning current, and the disadvantage it brings is greater than the benefits. It can be seen from the formula V = L (di/dt) that the voltage noise will increase as the inductance increases. As the switching current increases (because the sampling rate of the converter increases), the voltage noise will also increase. Therefore, the ground floor should be connected together.
One example is that in some applications, in order to meet the traditional design requirements, the dirty bus power or digital circuit must be placed in some areas. At the same time, it is also affected by the size restrictions. In this case, the separation ground layer is to achieve good performance
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