High-speed PCB circuit power integrity simulation analysis

Abstract

Aiming at the increasingly complicated high-speed PCB power supply voltage fluctuation problem, a method based on PDN(Power Distribution Network) and target impedance co-simulation design is proposed for the 1.15 V power network. PI(Power Integrity) was studied. Mainly involved in two aspects：(1)DC analysis, by widening the copper area, reducing the return path and other measures to reduce the 1.15 V voltage drop from 9 mV to 2.5 mV, the temperature from 1.3 ℃ to 0.1 ℃, DC current density from 91.340 3 A/mm2 drops to 82.393 5 A/mm2；(2)AC analysis, from the resonance distribution and PDN input impedance analysis, add 22 μF decoupling capacitor at the 987.34 MHz resonance point to build a decoupling network to remove the risk point. The simulation results show that the method effectively reduces the risk of potential voltage fluctuation and target impedance mismatch in high-speed PCB circuits, thus improving the stability and reliability of the power system.

Keywords

• pcb
• power integrity
• pdn
• target impedance