Abstract
The two-port shunt configuration is often heralded as the gold standard for low-impedance measurements. However, this measurement method is not without its own issues. The shunt configuration inherently creates a ground loop between the measurement device's reference plane and the reference of the device under test (DUT). Additionally, probes often must be oriented in such a way that allows inductive coupling to occur. This work uses microprobes to measure the shunt impedance of a non-ideal short to explore the limitations of this measurement method in terms of both frequency and impedance. It highlights the importance of ground loop isolation and common-mode rejection ratio (CMRR) as well as limitations resulting from the mutual inductance between probes. The conclusions of these experimental measurements aim to find a path to further optimize shunt impedance measurements for power distribution networks (PDNs) as the industry points towards further lowering PDN impedance to meet increased current demands.
Recommended Citation
F. Squires et al., "Obstacles and Mitigations for an Accurate Low Impedance, Low Frequency Measurement," IEEE International Symposium on Electromagnetic Compatibility, pp. 210 - 214, Institute of Electrical and Electronics Engineers, Jan 2025.
The definitive version is available at https://doi.org/10.1109/EMCSIPI52291.2025.11170207
Department(s)
Electrical and Computer Engineering
Keywords and Phrases
common-mode current; microprobes; power distribution network; two-port shunt
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
