Chua's diode

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Current-voltage characteristic of Chua's diode

In electronics and chaos theory, Chua's diode[1] is a type of two-terminal, nonlinear active resistor which can be described with piecewise-linear equations. It is an essential part of Chua's circuit, a simple electronic oscillator circuit which exhibits chaotic oscillations and is widely used as an example for a chaotic system. It is implemented as a voltage-controlled, nonlinear negative resistor.

The diode is not sold commercially, and is usually built from standard circuit components such as diodes, capacitors, resistors and op-amps. There are multiple ways to simulate Chua's diode using such components. One standard design is realized by connecting two negative impedance converters in parallel. A negative impedance converter (NIC) is a simple op amp circuit that has negative resistance. Another implementation uses one negative impedance converter to create the negative resistance characteristic, and a diode-resistor network to create the nonlinear characteristic.

Chua's diode was invented by Leon Chua, who is also the inventor of Chua's circuit.


  1. ^ Chua, Leon. "The Chua Diode is Locally Active". Scholarpedia. Retrieved January 10, 2018. 
  • Kılıç, Recai (2010). A practical guide for studying Chua's circuits. World Scientific series on nonlinear science. Series A, Monographs and treatises. Singapore ; Hackensack, N.J: World Scientific. ISBN 9814291137. 

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