Operational Transconductance Amplifier

This paper presents a chaotic integrated circuit based on a dual-delay voltage-controlled oscillator (VCO). To address the hardware limitations associated with the traditional Chua circuit using discrete components, the proposed circuit employs the SMIC 180 nm CMOS process to achieve full integration. A dual-delay VCO regulates the oscillation frequency, while an operational trans-impedance amplifier (OTA) controls the gain within the circuit. The chaotic behavior of the integrated circuit is evaluated using Lyapunov exponents, bifurcation diagrams, and phase diagrams.