Behavioral circuit models of power BAW resonators and filters

A nonlinear circuit model taking into account the parasitics of the resonator connection to the measurement bench is presented; the measured data agree with the simulation results, except some undulations in the frequency dependence of the 2f harmonic component of the reflected power. New models for the anti-series and the anti-parallel connections of two resonators are proposed. The frequency warping effect is discussed together with its elimination using the Gear methods up to the sixth order.