Comment on "Modeling of Three Terminal Devices: A Black-Box Approach

In this letter, models for
x
-controlled concave and convex resistors are presented. These models are valid for all prescribed piecewise-linear conductance and resistance functions as defined in [1]. In conjunction with the results in [1], three-terminal resistors, characterized by two families of piecewise-linear
V-1
curves, are shown to be realizable by ideal diodes, linear resistors, independent sources, linear-controlled sources, and square-law devices.