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.

Current-voltage characteristic of Chua's diode

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.

References
  1. Chua, Leon (9 October 2007). "The Chua Diode is Locally Active". Scholarpedia. 2 (10): 1488. doi:10.4249/scholarpedia.1488. 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 978-9814291132.
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