Dynamic behaviors in two novel autonomous circuits with a physical negative resistor characterized by nonsymmetric function

Presents two novel three-order autonomous circuits. The nonlinear element in the circuits may be any physical negative resistor, either piecewise-linear or irregular. Using a type-S negative resistance element, the authors observed the double scroll attractors similar to that in Chua´s circuit. Using an avalanche transistor, they observed more complicated dynamic behaviors than in other autonomous circuits with piecewise-linear and symmetric elements