MOS realization of the modified Lorenz chaotic system

A new chaotic oscillator circuit that realizes three attractors, the modified Lorenz system, Lorenz attractor “Butterfly attractor” and unsymmetrical modified Lorenz system [IEEE Trans. Circ. Syst. I 48 (2001) 289] is given in the paper. The general block diagram of this circuit is introduced based on gm–C integrators. The overall circuit realization using MOS transistors and using low supply voltage is given. The proposed circuit depends on the use of grounded capacitors which provides the freedom to be off chip. A new block diagram called voltage controlled current direction is also introduced and its realization using MOS transistors is given. Numerical and PSpice simulations are also provided to confirm its functionality.