SMALL-SIGNAL AMPLIFICATION CAUSED BY NONLINEAR DIELECTRIC-PROPERTIES OF TGS - THEORETICAL PREDICTION AND EXPERIMENTAL-VERIFICATION BELOW PERIOD-DOUBLING AND SYMMETRY-BREAKING BIFURCATIONS

A series resonance circuit with ferroelectric TGS-capacitor is a pract ical realization of a nonlinear dynamical system. Depending on externa l parameters (e.g., amplitude and frequency of the driving voltage or temperature of the ferroelectric material) it is possible to observe p eriod doubling and symmetry breaking bifurcations or chaotic behavior. It can be shown theoretically that near such instabilities a dynamica l system can act to amplify small signals of suitably chosen frequenci es. This effect has been investigated experimentally in the series res onance circuit near period doubling and symmetry breaking bifurcations . The experimental results are in good agreement with theoretical pred ictions.