Decoupling Capacitor Selection Method Based on Maximum Time-domain Transient Noise
LIU Yang BAI Yujie LUO Houxing XIA Jianqiang
(The Institute of Electronic CAD, Xidian University, Xi'an 710071, China)
(Key Lab of High-Speed Circuit Design and EMC, Ministry of Education, Xidian University, Xi'an 710071, China)
Abstract：A decoupling capacitor selection method based on maximum time-domain transient noise is proposed to solve the over-design problem caused by the traditional method based on the frequency-domain target impedance. According to the property that the current in board level can be approximated by a series of triangular pulses, the time to reach the decoupling capacitor's local maximum transient voltage noise and the condition which should be satisfied for the time-domain transient impedance are derived. Meanwhile, the time range of decoupling is determined by analyzing the maximum transient voltage noise of VRM branch. In addition, the selection criteria for the decoupling capacitors are developed by researching the properties and characteristics of the time-domain transient impedance curves of the decoupling capacitors. Finally, the decoupling design scheme based on the maximum time-domain transient noise is proposed. Comparing with the traditional frequency-domain decoupling scheme, the results of decoupling design for four examples with typical stimulus settings show that the quantity of capacitors can be reduced by more than 24.59% by the proposed algorithm under the condition of the same input excitation and satisfying the requirement of voltage noise.
刘洋,白钰杰,罗厚兴,夏建强. 基于最大时域瞬态噪声的去耦电容选择方法[J]. 电子与信息学报, 2017, 39(11): 2763-2769.
LIU Yang, BAI Yujie, LUO Houxing, XIA Jianqiang. Decoupling Capacitor Selection Method Based on Maximum Time-domain Transient Noise. JEIT, 2017, 39(11): 2763-2769.
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