多层陶瓷电容的二维电子噪声研究

he electronic noise of multilayer ceramic capacitor is very sensitive to damage and degradation. Before use electronic noise to characteristic it’s reliability, establishing a clear electronic noise model of it is needed .However, the existing models consider only the electrons fluctuation in parasitic resistances, but not the polaron fluctuation of capacitor dielectric. So the electronic noise phenomenon of multilayer ceramic capacitors cannot explain reasonably. Therefore, based on the microscopic mechanism of fluctuation and dissipation by two-element excitation in multilayer ceramic capacitors, a two-dimensional electronic noise model of multilayer ceramic capacitors is established. Use the high order statistics method to analysis the time-frequency data of electronic noise. The electronic noise power spectral density and double spectra of multilayer ceramic capacitors are obtained. Intuitively reveals the dynamic change law of the two elementary (electronics and polaron) excitation fluctuation with the temperature in the device. A method for the characterization of two-dimensional electronic noise produced by the fluctuation and dissipation process of two-element excitation in multilayer structures is studied.