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Related Experiment Videos

Bistability in a complementary metal oxide semiconductor inverter circuit.

Thomas L Carroll1

  • 1Code 6362, US Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, DC 20375, USA. thomas.l.carroll@nrl.navy.mil

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

Digital inverter circuits, typically immune to radiofrequency (rf) interference, can exhibit bistability when driven by high-frequency signals. This unexpected behavior allows for the generation of low-frequency signals by switching between these stable states.

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Area of Science:

  • Electrical Engineering
  • Nonlinear Dynamics
  • Circuit Theory

Background:

  • Radiofrequency (RF) signals can interfere with low-frequency electronic circuits.
  • Digital inverter circuits are generally considered robust against RF interference due to their discrete output states (0 V and 5 V).

Purpose of the Study:

  • To investigate the potential for digital inverter circuits to exhibit unexpected behavior when subjected to high-frequency signals.
  • To demonstrate and model the phenomenon of bistability in digital inverters under RF drive.

Main Methods:

  • Experimental demonstration of bistability in a digital inverter circuit driven by a radiofrequency signal.
  • Development and analysis of a simplified theoretical model to explain the observed bistability.

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Main Results:

  • A digital inverter circuit, when driven by a high-frequency signal, can enter a bistable regime with two coexisting stable states, neither at 0 V nor 5 V.
  • Slowly modulating the RF drive signal allows for switching between these stable states, generating a low-frequency output signal.
  • The experimental findings are consistent with the predictions of the developed circuit model.

Conclusions:

  • Digital inverter circuits are not entirely immune to RF signal disruption and can exhibit complex nonlinear behavior.
  • The observed bistability in digital inverters presents a novel mechanism for generating low-frequency signals from high-frequency inputs.
  • This phenomenon has implications for understanding circuit behavior in the presence of RF interference and for potential applications in signal generation.