Noise Analysis and Improvement of Power Supply Network Based on Power Integrity

Power supply integrity is very important in digital systems. When the frequency on the power loop becomes higher, the impedance on the loop will gradually increase. The change in voltage drop will also cause the fluctuation of the output voltage to increase, and eventually causing the overall system becomes unstable and loses efficiency. The coupling capacitance on the loop plays an important role for these phenomenon. In this paper, the output voltage of the switching power supply is supplied to the microcontroller for operation. Simulation software is used to analyze the impedance on the power loop, and the circuit board is used to implement the method of operation and measurement will be discussed in depth on their principles and characteristics.