Measurement of a digital non-Foster negative RLC circuit and digital positive RLC circuit

Abstract

Measurements and theory are presented for digital discrete-time implementations of series non-Foster negative RLC (resistor-inductor-capacitor) circuits and series positive RLC circuits. This new digital RLC design approach builds upon recent digital implementations of other non-Foster circuits such as negative RC (resistor-capacitor) and negative RL (resistor-inductor) circuits. Such digital implementations of non-Foster circuits have shown promise in addressing common design challenges, such as stability, that may be more difficult to control in analog non-Foster circuits. Furthermore, a digital approach offers inherent potential advantages in applications such as software-tunable or adaptive digital implementations of negative RLC or positive RLC circuits. To confirm the proposed approach and underlying theory, simulation results and prototype measurements are provided that demonstrate the efficacy of digital implementations of both positive RLC and negative RLC circuits.