Patent ID: 11923829
Assignee: SKYWORKS SOLUTIONS, INC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 19:
20. A method of forming an electronic filter, the method comprising:
forming a plurality of series arm acoustic wave resonators electrically connected in series between an input port and an output port;
forming a plurality of parallel arm acoustic wave resonators electrically connected on first sides between respective ones of the plurality of series arm acoustic wave resonators and electrically connected on second sides to ground; and
forming at least one additional acoustic wave resonator electrically connected in parallel with one of one of the plurality of series arm acoustic wave resonators, the at least one additional acoustic wave resonator having a temperature coefficient of frequency lower than a temperature coefficient of frequency of the acoustic wave resonator to which it is electrically connected in parallel and having a resonant frequency below a lower edge of a passband of the filter.