Application of the Input-Output Equivalent Sources Method for the Simulation of Nonlinearities in TC-SAW Resonators and Filters

A good understanding of the nonlinearity mechanism in SAW devices is a crucial aspect in the filter stage. Nonlinear intermodulation distortion (IMD) may lead to spurious signals falling into the receiver band and limiting its sensitivity. Identify the dominant source of nonlinearity specially at high-power is important for a good prediction of the filter nonlinear response. In this work, third-order intermodulation (IMD3) products in TC-SAW (Temperature Compensated-SAW) devices are presented. Within this work we apply the previously developed Input-Output Equivalent Sources (IOES) method to compute nonlinearities of more complex structures such as ladder-type and CRF (Coupled Resonator Filter) filter structures.