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US 12,136,911 B2Granted
FBAR filter with integrated cancelation circuit
AssigneeSkyworks Solutions, Inc.
InventorJoshua James Caron
Life of this patent
Estimating the term…
Abstract
An acoustic wave device includes an acoustic wave filter configured to filter a radio frequency signal and a loop circuit coupled to the acoustic wave filter. The loop circuit is configured to generate an anti-phase signal to a target signal at a particular frequency. The loop circuit includes a Lamb wave resonator having a piezoelectric layer and an interdigital transducer electrode disposed on the piezoelectric layer. The piezoelectric layer includes free edges. An edge of the piezoelectric layer is configured to one of suppress or scatter reflections of acoustic waves generated by the interdigital transducer electrode from the edge of the piezoelectric layer.
Claims20
An acoustic wave device comprising:
- an acoustic wave filter configured to filter a radio frequency signal;
- and
- a loop circuit coupled to the acoustic wave filter, the loop circuit configured to generate an anti-phase signal to a target signal at a particular frequency, the loop circuit including an acoustic wave element having a piezoelectric layer and an interdigital transducer electrode disposed on the piezoelectric layer, an edge of the piezoelectric layer configured to one of suppress or scatter reflections of acoustic waves generated by the interdigital transducer electrode from the edge of the piezoelectric layer, the edge of the piezoelectric layer including multiple curved portions.
A radio frequency module comprising:
- a duplexer including an acoustic wave device, the acoustic wave device including an acoustic wave filter configured to filter a radio frequency signal and a loop circuit coupled to the acoustic wave filter, the loop circuit configured to generate an anti-phase signal to a target signal at a particular frequency, the loop circuit including an acoustic wave element having a piezoelectric layer and an interdigital transducer electrode disposed on the piezoelectric layer, an edge of the piezoelectric layer configured to one of suppress or scatter reflections of acoustic waves generated by the interdigital transducer electrode from the edge of the piezoelectric layer, the edge of the piezoelectric layer including multiple curved portions;
- and
- a radio frequency switch arranged to pass a radio frequency signal associated with a port of the duplexer.
A wireless communication device comprising:
- a radio frequency front end including an acoustic wave device, the acoustic wave device including an acoustic wave filter configured to filter a radio frequency signal and a loop circuit coupled to the acoustic wave filter, the loop circuit configured to generate an anti-phase signal to a target signal at a particular frequency, the loop circuit including an acoustic wave element having a piezoelectric layer and an interdigital transducer electrode disposed on the piezoelectric layer, an edge of the piezoelectric layer configured to one of suppress or scatter reflections of acoustic waves generated by the interdigital transducer electrode from the edge of the piezoelectric layer, the edge of the piezoelectric layer one of including multiple curved portions;
- and
- an antenna in communication with the radio frequency front end.
A filter comprising:
- an input terminal;
- an output terminal;
- a main bulk acoustic wave filter circuit connected between the input terminal and the output terminal, the main bulk acoustic wave filter circuit having a first phase characteristic, a first passband, and a first stopband;
- and a phase shift circuit connected in parallel with the main bulk acoustic wave filter circuit between the input terminal and the output terminal, the phase shift circuit including a first capacitor element, a second capacitor element, and an acoustic wave element connected in series between the first capacitor element and the second capacitor element, the acoustic wave element including at least two interdigitated transducer electrodes disposed apart from each other on a piezoelectric layer in a single acoustic wave path along which acoustic waves propagate through the acoustic wave element, the piezoelectric layer including free edges, an edge of the piezoelectric layer configured to one of suppress or scatter reflections of acoustic waves generated by the acoustic wave element from the edge of the piezoelectric layer, the edge of the piezoelectric layer including multiple curved portions, the phase shift circuit having a second phase characteristic that is opposite to the first phase characteristic in an attenuation band that corresponds to at least a portion of the first stopband.
1 more element
Dependencies are inferred from the claim text.