Abstract
The voltage regulator module (VRM) impacts the power distribution network (PDN) impedance in the low frequency range. The effect of VRM is essential for reliable PDN analysis and simulation. However, the existing VRM models for power integrity (PI) simulation lack an in-depth understanding of the effect of the feedback control in the VRM. In this paper, the impact of the VRM control loop on the PDN impedance is investigated. The relationship between the VRM output impedance and the PDN impedance at the IC input pin is derived. The output impedance of a VRM is analyzed using small signal analysis. Eventually, the PDN impedance considering the VRM is obtained. The analysis method was validated on a commercial VRM. The proposed method can be used to calculate the PDN impedance with the VRM on in the PDN design stage.
Recommended Citation
H. Zhang et al., "Impact of Voltage Regulator Modules on Power Distribution Network Impedance," IEEE International Symposium on Electromagnetic Compatibility, pp. 541 - 546, Institute of Electrical and Electronics Engineers, Jan 2025.
The definitive version is available at https://doi.org/10.1109/EMCSIPI52291.2025.11170253
Department(s)
Electrical and Computer Engineering
Keywords and Phrases
impedance; power distribution network; power integrity; voltage regulator module
International Standard Serial Number (ISSN)
2158-1118; 1077-4076
Document Type
Article - Conference proceedings
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2025 Institute of Electrical and Electronics Engineers, All rights reserved.
Publication Date
01 Jan 2025
