Management of Stored Energy in Acoustic Wave Ladder Filters to Improve Yield

The design of acoustic wave ladder is strongly limited by the resonator material properties. That is why transmission zeros, return loss and cut-off frequency are usually controlled independently by adjusting the resonant frequencies of the resonators to meet specifications. However, when a solution has to be mass-produced, the sensitivity of the structure must also be taken into account so that the economical cost is feasible. Consequently, time-consuming post-optimizations are used through very slow statistical analysis to increase yield, leaving aside equiripple solution. This article improves the sensitivity of acoustic wave ladder synthesis so that it can be mass produced efficiently, considering the relationship between stored energy and sensitivity to obtain faster and better results in terms of yield with Generalized Chebyshev functions and even more so with Non-Equiripple functions.