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Related Experiment Videos

Multiple time scale chaos in a Schmitt trigger circuit.

Thomas L Carroll1

  • 1Code 6362, U.S. Naval Research Laboratory, Washington, DC 20375, USA.

Chaos (Woodbury, N.Y.)
|October 29, 2005
PubMed
Summary

Stray radio frequency signals cause circuit disruption through nonlinear effects. A single-transistor Schmitt trigger circuit exhibits broadband chaos, revealing mechanisms of operational disruption.

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Area of Science:

  • Electronics
  • Nonlinear Dynamics
  • Chaos Theory

Background:

  • Stray radio frequency (RF) signals can induce nonlinear effects, disrupting electronic circuit operations.
  • The precise mechanisms behind RF signal-induced circuit disruption remain incompletely understood.

Purpose of the Study:

  • Investigate the disruptive effects of high-frequency signals on an emitter-coupled Schmitt trigger circuit.
  • Characterize the nonlinear dynamics and chaos generated within the circuit under RF signal drive.

Main Methods:

  • An emitter-coupled Schmitt trigger circuit was subjected to high-frequency signal driving.
  • Analysis of power spectrum peaks and frequency conversion effects during transitions between mode-locked states.
  • Circuit simulation was employed to validate observed frequency conversion phenomena.

Main Results:

  • A region of chaos was observed during transitions between mode-locked states (e.g., period 2 to period 3).
  • The chaotic state exhibited a broadband power spectrum with peaks unrelated to integer multiples of the driving frequency.
  • Extremely broadband chaos, spanning orders of magnitude from megahertz down to hertz, was generated by a single-transistor circuit.
  • True quasiperiodicity was not observed in this specific circuit configuration.

Conclusions:

  • A single-transistor emitter-coupled Schmitt trigger circuit can generate extremely broadband chaos.
  • The observed chaos provides insight into the mechanisms of RF signal-induced circuit disruption.
  • The circuit demonstrates significant frequency conversion capabilities, contributing to operational anomalies.

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