A Generic Hybrid Modeling Approach for the Complete Response of Acoustic Resonator

The growing prevalence of RF acoustic filters has emphasized the need for a model for accurate resonator frequency response including spurious modes. Traditional modeling methods have their limitation and cannot fully accommodate the fast-paced design work. This paper proposes a generic hybrid modeling approach for complete response of acoustic resonators. A systematic technique is presented by splitting an acoustic resonator model into two parts: 1) the main mode is simulated by a one-dimensional non-linear circuit model and 2) spurious modes are simulated from a data-based s-parameter model. Moreover, resonator non-linearity caused by spurious modes is introduced by adding a non-linear voltage source. This hybrid model is able to predict both small signal and large signal behaviors of resonators. This modeling approach is consolidated at resonator level and is proved to be useful in the filter design.