Effect of External Source Impedance on the Input Impedance of Digital Impedance Circuits. - Kristy A. Hecht; Christopher G. Daniel; Thomas P. Weldon (ISCAS, 2020)

A Stable Digital Impedance Circuit Design Method for Resistive Source Impedances. - Christopher G. Daniel; Thomas P. Weldon (IEEE Open J. Circuits Syst., 2022)

Design of Stable Digital Non-Foster Impedances for Electrically-Small Antennas Beyond The Chu Limit. - Thomas P. Weldon; Christopher G. Daniel (IEEE DataPort, 2022)