➀ Modern electronic design trends necessitate SI-PI cosimulation to minimize power consumption and voltage levels while increasing speed. ➁ The PDN should be meticulously modeled to minimize input impedance seen by I/O drivers, and combined with channel models to accurately predict output eye diagrams. ➂ The article details the complete modeling process of SI-PI cosimulation based on HBM, highlighting considerations for high-frequency PDN design at the chip and package levels.