Equivalent-circuit-based Stability Analysis of non-Foster SCS Negative Capacitor

Equivalent circuit of a non-Foster negative capacitor, based on an SCS voltage-inversion negative converter with one-pole and two-pole amplifier model, has been developed. The circuit was loaded with an external RC network of series or parallel type, and the stability of the whole system is investigated. It was found that there is always a trade-off between operating bandwidth and the range of external capacities and resistances that assure stable operation.