基于最大時域瞬態(tài)噪聲的去耦電容選擇方法

劉洋; 白鈺杰; 羅厚興; 夏建強

doi:10.11999/JEIT170210

基于最大時域瞬態(tài)噪聲的去耦電容選擇方法

doi: 10.11999/JEIT170210

基金項目:

國家自然科學基金項目(61501345)，中央高?；究蒲袠I(yè)務(wù)費(JB150212)

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- 文章訪問數(shù): 1408
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2017-03-07
- 修回日期: 2017-07-10
- 刊出日期: 2017-11-19

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

Funds:

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

摘要

摘要: 針對傳統(tǒng)的基于頻域目標阻抗的去耦電容選擇方法存在過度設(shè)計的問題，該文提出基于最大時域瞬態(tài)噪聲的去耦電容選擇方法。首先，利用板級電流可由一系列三角脈沖近似合成這一性質(zhì)，推導出了去耦電容瞬態(tài)電壓噪聲達到局部最大值的時刻及時域瞬態(tài)阻抗應(yīng)該滿足的條件，并通過分析VRM支路最大瞬態(tài)電壓噪聲確定了去耦電容的去耦時間范圍；其次，通過研究去耦電容時域瞬態(tài)阻抗曲線的性質(zhì)和特點，制定了去耦電容的選擇標準。最后，提出基于最大時域瞬態(tài)噪聲的去耦設(shè)計方案。通過對4個具有典型激勵輸入的實例進行去耦設(shè)計，結(jié)果表明，在輸入激勵條件相同且滿足電壓噪聲要求的前提下，與傳統(tǒng)頻域目標阻抗法獲得的去耦方案相比，該文提出的算法所需電容數(shù)量至少能減少24.59%以上。
- 集成電路 /
- 最大時域瞬態(tài)噪聲 /
- 時域瞬態(tài)阻抗 /
- 時域去耦范圍
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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參考文獻(17)

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