Decoupling Capacitor Selection Method Based on Maximum Time-domain Transient Noise

LIU Yang; BAI Yujie; LUO Houxing; XIA Jianqiang

doi:10.11999/JEIT170210

Volume 39 Issue 11

Nov. 2017

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LIU Yang, BAI Yujie, LUO Houxing, XIA Jianqiang. Decoupling Capacitor Selection Method Based on Maximum Time-domain Transient Noise[J]. Journal of Electronics & Information Technology, 2017, 39(11): 2763-2769. doi: 10.11999/JEIT170210

Citation:

LIU Yang, BAI Yujie, LUO Houxing, XIA Jianqiang. Decoupling Capacitor Selection Method Based on Maximum Time-domain Transient Noise[J]. Journal of Electronics & Information Technology, 2017, 39(11): 2763-2769. doi: 10.11999/JEIT170210

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Decoupling Capacitor Selection Method Based on Maximum Time-domain Transient Noise

doi: 10.11999/JEIT170210

Funds:

The National Natural Science Foundation of China (61501345), The Fundamental Research Funds for the Central Universities of China (JB150212)

Received Date: 2017-03-07
Rev Recd Date: 2017-07-10
Publish Date: 2017-11-19

Abstract

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.
- Integrated Circuit (IC),
- Maximum time-domain transient noise,
- Time-domain transient impedance,
- Time-domain decoupling range

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References(17)

References

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