Carrier aggregation (CA) and the resulting increasing number of filter chips per multiplexer modules has significantly changed linearity requirements. Accurate prediction of non-linear performance in BAW is crucial to be able to optimize a design of a filter for the required linearity specifications. Aspects for model simplification in simulation are discussed and examples given to show the sensitivity of non-linear prediction accuracy on the model. The scope of the paper is to present general approaches to improve the linearity in a single BAW filter, considering as well additional constraints and challenges applying for multiplexer modules. Factors for response variation as well as the effects of acoustic modes on the non-linearity are presented.
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