Low-Voltage Chaotic Oscillator With an Approximate Cubic Nonlinearity

A compact eight-transistor grounded nonlinear resis- tor possessing cubic-like current-voltage characteristics and op- timized for low-voltage operation ( 1.5V) is designed in a 2 CMOS process. The resistor is then incorporated into the well- known Chua's circuit and tuned to develop the double-scroll chaotic attractor. The inherent nonlinear behaviours of a single- ended differential pair and simple current mirrors are used to shape the resistor characteristics.