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1. Effect of External Source Impedance on the Input Impedance of Digital Impedance Circuits

   https://doi.org/10.1109/ISCAS45731.2020.9180570  

   Hecht, Kristy A. ; Daniel, Christopher G. ; Weldon, Thomas P. ( October 2020 , 2020 IEEE International Symposium on Circuits and Systems (ISCAS))

   The input impedance of recently-introduced digital impedance circuits has been discovered to be dependent on the impedance of the external signal source. To address this problem, the theory for the dependence of digital impedance on external source resistance is presented. These digital impedance circuits provide an important digitally-controlled digitally-tunable alternative approach to difficult design problems, such as design of negative capacitances for stable wideband non-Foster antennas and metamaterials. Unfortunately, undesired source-dependent variation of the digital impedance can arise in scenarios where off-the-shelf high-speed analog-to-digital and digital-to-analog converters commonly have 50 ohm impedance. Further complicating matters, the sensitivity of digital impedance on source resistance appears to also depend on other design parameters of the digital circuit. Therefore, theory and simulation results are presented to show the dependence of digital impedance on the external source resistance. Lastly, measured results for a prototype of a digital non-Foster negative capacitance confirm the theoretical results. 

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2. Simulation of Localized Surface Plasmon Resonances in Two Dimensions via Impedance-Impedance Operators

   https://doi.org/10.1137/20M133066X  

   Nicholls, David P. ; Tong, Xin ( January 2021 , SIAM Journal on Applied Mathematics)

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3. A Wearable CMOS Impedance to Frequency Sensing System for Non-Invasive Impedance Measurements

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   Hedayatipour, Ava ; Aslanzadeh, Shaghayegh ; Hesari, Shahram Hatefi ; Haque, Mohammad Aminul ; McFarlane, Nicole ( October 2020 , IEEE Transactions on Biomedical Circuits and Systems)

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4. New opportunities for fracture healing detection: Impedance spectroscopy measurements correlate to tissue composition in fractures: IMPEDANCE FOR FRACTURE HEALING DETECTION

   https://doi.org/10.1002/jor.23570  

   Lin, Monica C. ; Yang, Frank ; Herfat, Safa T. ; Bahney, Chelsea S. ; Marmor, Meir ; Maharbiz, Michel M. ( June 2017 , Journal of Orthopaedic Research)
5. Sequence Impedance Modeling of Grid-Forming Inverters

   https://doi.org/10.1109/PESGM46819.2021.9638001  

   Yan, Weihang ; Shah, Shahil ; Gevorgian, Vahan ; Gao, David Wenzhong ( July 2021 , 2021 IEEE Power & Energy Society General Meeting (PESGM))