Filter with BAW acoustic resonators, with digital reconfiguration and method

摘要

The circuit has sets of two-terminal-pair networks connected in cascade with each other. The networks comprise series branches (315, 325, 335) with acoustic resonators e.g. bulk acoustic wave type acoustic resonators (311, 321, 331), and parallel branches (316, 326, 336) with bulk acoustic wave type acoustic resonators (312, 322, 332), respectively. The parallel branch (316) comprises a capacitor (313) connected in series with the resonator (312) and connected in parallel with a switching transistor (314) that short-circuits the capacitor. An independent claim is also included for a method for reducing interference subjected by a receiving circuit for a mobile telephone.