Digital Impedance Circuits and Digital Non-Foster Circuits
New research provides digitally-implemented impedances that enable practical fabrication of exotic impedances such as negative capacitors and negative inductors. For example, non-Foster impedances such as negative capacitance and negative inductance enable antenna designs that have bandwidths that greatly exceed the theoretical Wheeler-Chu bandwidth limit. These exotic impedances have the potential for breaking classical barriers of fundamental physics in electromagnetics, acoustics, and mechanical systems.
Digital Impedance Circuits
Recently, we discovered that digital impedances are dependent on the source impedance of the external source that drives the digital impedance. To address this source dependence, we recently developed a new design procedure in our recent article: Christopher G. Daniel, Jr. and Thomas P. Weldon, “A Stable Digital Impedance Circuit Design Method for Resistive Source Impedances,” in IEEE Open Journal of Circuits and Systems, vol. 3, pp. 109-114, 2022, doi: 10.1109/OJCAS.2022.3174694.