A Study on How Capacitance of Power Filtering Circuit Influences the Antiresonance Frequency

This article is dedicated to solving the problem of how to help engineers to optimize the power filtering circuit design. Through a thorough investigation, we discovered a significant relationship between the total capacitance in the circuit and the occurrence of antiresonance point. When the ferrite bead or inductor is constant, an increase in the total circuit capacitance leads to a proportional decrease in the antiresonance frequency. This inverse relationship is mathematically expressed in Eq. (4), which illustrates the ratio between the increase in capacitance and the corresponding decrease in antiresonance frequency. The finding contributes to a deeper understanding to the PDN (power distribution network) design and offers insights for optimizing circuit design to minimize the impact of antiresonance phenomenon.