现代电子技术
現代電子技術
현대전자기술
MODERN ELECTRONICS TECHNIQUE
2014年
10期
144-146,149
,共4页
电源完整性%谐振%SIWAVE仿真分析%去耦电容
電源完整性%諧振%SIWAVE倣真分析%去耦電容
전원완정성%해진%SIWAVE방진분석%거우전용
power integrity%resonance%SIWAVE simulating and analysis%decoupling capacitor
谐振是电源完整性一大问题，PCB电源平面间谐振振幅过大，会导致电源分配系统（PDS）工作异常，甚至成为EMI辐射源，故在PCB详细设计阶段需开展谐振仿真分析并消除谐振，从而提高设计成功率。为消除谐振，首先利用SI-WAVE软件对电源地平面间谐振情况进行仿真分析，找出谐振点，然后合理选用布局去耦电容，消除400 MHz以下频段谐振影响。通过调整PCB叠层及层间距消除400 MHz以上频段谐振影响。通过实例仿真分析，依据工程经验，实现了快速估算去耦电容的计算方法，并证明了其正确性。
諧振是電源完整性一大問題，PCB電源平麵間諧振振幅過大，會導緻電源分配繫統（PDS）工作異常，甚至成為EMI輻射源，故在PCB詳細設計階段需開展諧振倣真分析併消除諧振，從而提高設計成功率。為消除諧振，首先利用SI-WAVE軟件對電源地平麵間諧振情況進行倣真分析，找齣諧振點，然後閤理選用佈跼去耦電容，消除400 MHz以下頻段諧振影響。通過調整PCB疊層及層間距消除400 MHz以上頻段諧振影響。通過實例倣真分析，依據工程經驗，實現瞭快速估算去耦電容的計算方法，併證明瞭其正確性。
해진시전원완정성일대문제，PCB전원평면간해진진폭과대，회도치전원분배계통（PDS）공작이상，심지성위EMI복사원，고재PCB상세설계계단수개전해진방진분석병소제해진，종이제고설계성공솔。위소제해진，수선이용SI-WAVE연건대전원지평면간해진정황진행방진분석，조출해진점，연후합리선용포국거우전용，소제400 MHz이하빈단해진영향。통과조정PCB첩층급층간거소제400 MHz이상빈단해진영향。통과실례방진분석，의거공정경험，실현료쾌속고산거우전용적계산방법，병증명료기정학성。
Resonance is a major problem of power integrity. If the resonance amplitude between PCB power planes is too large,it may cause PDS work abnormal,even cause the power planes to become EMI emitter,so in the detailed PCB design stage,simulation analysis of resonance and eliminating resonance are needed for improving the success rate of the design. To eliminate resonance,first,the SIWAVE is used to simulate and analyze the resonance between the power planes to find the reso-nance point,and then the decoupling capacitor is selected and layouted reasonably,so as to eliminate the influence caused by the resonance below 400 MHz frequency,and eliminate the influence caused by the resonance above 400 MHz frequency by ad-justing the PCB overlayers and the space between overlayers. Based on engineering experience,a rapid calculation method to es-timate the value of the decoupling capacitors was achieved. Its correctness was proved with simulation analysis on example.
