Chaotic dynamics of a three-phase clock-driven oscillator with dual voltage controllability

Abstract

In this work, we study a novel dual-voltage-controlled chaotic oscillator by using a three-phase clock. The chaotic oscillator is based on two nonlinear functions, which are needed for chaotic signal generation. The proposed chaotic circuit consists of three non-overlapping clock-driven MOS (metal oxide semiconductor) switches for S/H (sample and hold), a level shifter, and two nonlinear functions for nonlinearity in the feedback. After nonlinear functions for chaotic signal generation had been optimized, the proposed circuit was simulated with SPICE (Simulation Program with Integrated Circuit Emphasis) program using a 0.6 µm CMOS (complementary metal oxide semiconductor) process parameter. For various control voltages, its chaotic dynamics, such as time waveform, bifurcation diagram and state transition diagram were analyzed. We confirmed that the circuit could generate discrete chaotic signals in specific control voltages. This circuit is expected to be utilized for various chaos applications.