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高速PCB电路电源完整性仿真分析

更新时间:2020-10-27 20:30:12 大小:3M 上传用户:zhengdai查看TA发布的资源 标签:pcb电路电源完整性 下载积分:1分 评价赚积分 (如何评价?) 打赏 收藏 评论(0) 举报

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针对日益复杂的高速印制电路板(Printed Circuit Board,PCB)电源电压波动问题,提出一种基于电源分配网络(Power Distribution Network,PDN)与目标阻抗协同仿真设计的方法,对1.15V电源网络的电源完整性(Power Integrity,PI)进行研究。主要涉及两个方面:(1)直流分析,通过加宽覆铜面积、减少回流路径等措施使1.15V电压降从9mV跌落至2.5mV、温度从1.3℃降至0.1℃、直流电流密度从91.3403A/mm^2降至82.3935A/mm^2;(2)交流分析,从谐振分布和PDN输入阻抗分析,在987.34MHz谐振点处添加22μF去耦电容,搭建去耦网络去除风险点。仿真结果表明该方法有效地减少了高速PCB电路潜在的电压波动和目标阻抗不匹配的风险,从而提高了电源系统稳定性和可靠性。

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/mm^2 drops to 82.393 5 A/mm^2;(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.

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