Coherence Resonance in a Schmitt-Trigger Inverter with Delayed Feedback

Abstract

We study the coherence resonance in a Schmitt-trigger inverter with a delayed feedback loop. The output of the system is analyzed changing the input noise amplitude and the delay time of the feedback loop. The regularity of the output shows resonance-like dependence on the input noise amplitude. At the optimum input noise amplitude, the system outputs well-regulated rectangular wave, and corresponding peaks in the output spectrum become large and sharp. This optimization of the system is accomplished when the period of the output rectangular wave almost coincides with the feedback delay time.