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

Claim 18:
19. An electronic filter comprising:
a plurality of series arm surface acoustic wave resonators electrically connected in series between an input port and an output port;
a plurality of parallel arm surface 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
at least one additional surface acoustic wave resonator electrically connected in parallel with one of one of the plurality of series arm acoustic wave resonators having a temperature coefficient of frequency (TCF) lower than a TCF of the acoustic wave resonator to which it is electrically connected in parallel, the at least one additional surface acoustic wave resonator having interdigital transducer electrodes covered by a thinner layer of SiO2 than the interdigital transducer electrodes of the plurality of parallel arm acoustic wave resonators.