Europhys. Lett.
Volume 71, Number 5, September 2005
Page(s) 723 - 729
Section General
Published online 10 August 2005
Europhys. Lett., 71 (5), pp. 723-729 (2005)
DOI: 10.1209/epl/i2004-10547-0

Excitable behavior of an operational amplifier

C.-M. Kim1, G.-S. Yim1, J.-W. Ryu1, 2, Y.-J. Park2 and D.-U. Hwang3

1  National Creative Research Initiative Center for Controlling Optical Chaos Pai Chai University - Daejeon 302-735, Korea
2  Department of Physics, Sogang University - Seoul 121-742, Korea
3  Istituto Nazionale di Ottica Applicata - 50125 Firenze, Italy

received 6 May 2004; accepted in final form 30 June 2005
published online 10 August 2005

We find excitable behavior in an operational amplifier (OPA27). When an output terminal is connected to an inverting input terminal through a resistor and a positive input terminal is connected to the ground, the simple electronic circuit exhibits a transition from a steady state to a relaxation oscillation state through quasi-harmonic and excitable pulsation states as the positive and the negative power supply voltages are varied. The observed distribution of the excitable pulsation intervals shows that the pulsations are phase-locked with the internal quasi-harmonic oscillation.

05.45.Ac - Low-dimensional chaos.
84.30.-r - Electronic circuits.

© EDP Sciences 2005