Fault conditions of a simple chaotic circuit under capacitor nonlinear effects

In this paper a tolerance analysis in the electronic design of a simple chaos generator is reported. This simple chaotic oscillator is composed by four resistors, three capacitors and two opamps. A Verilog-A model for the opamps and capacitors is used herein. For the opamp, the model contains input impedance, finite bandwidth with a dominant pole and voltage saturation effects. In case of capacitor, a nonlinear model based on a varactor is considered, which includes the charge-dependence with the voltage. By using H-Spice simulator, the sensitivity of the chaos generation in the simple chaotic oscillator as a function of the varactor is analyzed. Several H-Spice simulations are given.