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2025-12-18
Innovative Design and Investigation on Resistive and Capacitive Network Based NGD Topology
By
Progress In Electromagnetics Research Letters, Vol. 128, 54-60, 2025
Abstract
This paper investigates the circuit theory of elementary passive topology exhibiting reconfigurable positive/negative delay (RPND) effect. This novel evaluated framework enables identification of the first-order L-topology constituted by RC-network operating under RPND effect. The investigated passive L-cell can operate in both negative and positive group delay (NGD or PGD) mode depending on the RC-network parameter. After establishing the NGD existence condition, the design equations versus the RPND effect including the target parameter values are formulated. To validate the theory, an RC-circuit representing a RPND Proof-of-Concept (PoC) was designed, implemented and tested especially in the time-domain by verifying the time-advance signature corresponding to the NGD operation mode. By tuning a PoC resistor, experimentation of pulse and arbitrary waveform signals confirm the feasibility to observe RPND reconfigurability. In the NGD mode, it is observed that outputs in time-advance of their own inputs about -3 ms. The RPND circuit is particularly useful for adjusting delay effect and signal synchronization in the communication system.
Citation
Runtao Song, Sonia Moussa, Nathan B. Gurgel, Nicolas Waldhoff, Ali Hamada Damien Fakra, Dmitry Kholodnyak, Mathieu Guerin, Glauco Fontgalland, Fayu Wan, and Blaise Ravelo, "Innovative Design and Investigation on Resistive and Capacitive Network Based NGD Topology," Progress In Electromagnetics Research Letters, Vol. 128, 54-60, 2025.
doi:10.2528/PIERL25102001
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