Investigation on Third-Order Intermodulation Distortions Due to Material Nonlinearities in TC-SAW Devices
| Autor: | V. Chauhan, Markus Mayer, Amelie Hagelauer, Thomas Ebner, Ingo Bleyl, Andreas P. Mayer, Karl C. Wagner, Robert Weigel, Elena Mayer, Werner Ruile |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Acoustics and Ultrasonics business.industry Surface acoustic wave Substrate (electronics) 01 natural sciences Finite element method Power (physics) Nonlinear system Third order 0103 physical sciences Optoelectronics Electrical and Electronic Engineering business 010301 acoustics Instrumentation Scaling Intermodulation |
| Zdroj: | IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 65(10) |
| ISSN: | 1525-8955 |
| Popis: | Nonlinearity can give rise to intermodulation distortions in surface acoustic wave (SAW) devices operating at high input power levels. To understand such undesired effects, a finite element method (FEM) simulation model in combination with a perturbation theory is applied to find out the role of different materials and higher order nonlinear tensor data for the nonlinearities in such acoustic devices. At high power, the SAW devices containing metal, piezoelectric substrate, and temperature compensating (TC) layers are subject to complicated geometrical, material, and other nonlinearities. In this paper, third-order nonlinearities in TC-SAW devices are investigated. The materials used are LiNbO3-rot128YX as the substrate and copper electrodes covered with a SiO2 film as the TC layer. An effective nonlinearity constant for a given system is determined by comparison of nonlinear P-matrix simulations to third-order intermodulation measurements of test filters in a first step. By employing these constants from different systems, i.e., different metallization ratios, in nonlinear periodic P-matrix simulations, a direct comparison to nonlinear periodic FEM-simulations yields scaling factors for the materials used. Thus, the contribution of the different materials to the nonlinear behavior of TC-SAW devices is obtained and the role of metal electrodes, substrate, and TC film are discussed in detail. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|