Fast simulation method of Distributed Nonlinearities in Surface Acoustic Wave Resonators

Understanding the mechanism of nonlinearity in SAW/BAW devices is growing up in importance because these, even being weak, can cause desensitization of the receivers and limiting their performance. Proper nonlinear distributed models have been extensively used, usually running Harmonic Balance (HB) simulations being in some cases very time consuming. The motivation of this work is to apply a new method of analysis for the simulation of harmonics (H) and intermodulation products (IMD) generation in SAW devices. The method is called the Input-Output Equivalent Sources (IOES) and it allows extremely fast and robust simulations of large distributed weak nonlinear circuits.