Circuit working with acoustic volume waves and component connected to the circuit
View Patent ↗The invention relates to a circuit operating with bulk acoustic waves with at least electroacoustic systems, each arranged in a branch (Z 1 , Z 2 , Z 3 , Z 4 ), wherein each electroacoustic system comprises at least two series-connected resonators (R 11 , R 12 ; R 21 , R 22 ; R 31 , R 32 ; R 41 , R 42 ) in the respective branch, which are galvanically separated from one another and acoustically coupled to one another by means of a coupling system (K 1 , K 2 , K 3 , K 4 ) arranged therebetween. The electroacoustic systems are acoustically coupled via their coupling system (K 1 , K 2 ) and/or electrically coupled to one another.
1. A circuit for use with bulk acoustic waves, the circuit comprising:
a first electroacoustic system in a first branch;
a second electroacoustic system in a second branch;
wherein the first electroacoustic system comprises a first resonator and a second resonator that are in series in the first branch, that are galvanically separated, and that are acoustically coupled by a first coupling system;
wherein the second electroacoustic system comprises a first resonator and a second resonator that are connected in series in the second branch, that are galvanically separated, and that are acoustically coupled by a second coupling system;
wherein the first and second electroacoustic systems are acoustically coupled via the first and second coupling systems and/or are electrically coupled; and
a first electric port and a second electric port, wherein at least one of the first and second electric ports is symmetrically interconnected;
wherein a first signal path is between first terminals of the first and second electric ports;
wherein a second signal path is between second terminals of the first and second electric ports;
wherein the first branch corresponds to the first signal path and the second branch corresponds to the second signal path;
wherein the second terminal of the first electric port is electrically connected to a first reference potential;
wherein the second resonator of the first electroacoustic system is between the first terminal of the second electric port and a second reference potential; and
wherein the second resonator of the second electroacoustic system is between the second terminal of the second electric port and a third reference potential.
2. The circuit of claim 1 , wherein the first and second electroacoustic systems are electrically coupled.
3. The circuit of claim 1 , further comprising:
wherein the second branch corresponds to a first shunt arm connecting the first and second signal paths.
4. The circuit of claim 1 ,
wherein the first branch comprises a first shunt arm connecting the first and second signal paths, and the second branch comprises a second shunt arm in parallel with the first shunt arm.
5. The circuit of claim 1 , wherein the first and second coupling systems are electrically connected via a floating electrical connection.
6. The circuit of claim 1 , wherein the first and second coupling systems are capacitively or inductively coupled.
7. The circuit of claim 1 , wherein the first and second coupling systems are connected electrically via an electrical connection connected to a first reference potential.
8. The circuit of claim 1 , wherein the first resonators of the first and second electroacoustic systems are connected electrically in series.
9. The circuit of claim 1 , wherein the second resonators of the first and second electroacoustic systems are connected electrically in series.
10. The circuit of claim 1 , wherein the first resonators of the first and second electroacoustic systems are connected electrically in parallel.
11. The circuit of claim 1 , wherein the second resonators of the first and second electroacoustic systems are connected electrically in parallel.
12. The circuit of claim 1 , wherein each resonator comprises a transducer comprising an interdigitated comb-like electrode on a piezoelectric substrate.
13. The circuit of claim 1 , wherein the first resonator, the first coupling system, and the second resonator of the first electroacoustic system are arranged in a first resonator stack; and
wherein the first resonator, the second coupling system, and the second resonator of the second electroacoustic system are arranged in a second resonator stack.
14. The circuit of claim 13 , wherein the first and second resonator stacks are electrically connected.
15. The circuit of claim 1 , wherein the first coupling system comprises a first sub-structure and a second sub-structure;
wherein the first resonator of the first electroacoustic system and the first sub-structure of the first coupling system form a first resonator stack;
wherein the second resonator of the first electroacoustic system and the second sub-structure of the first coupling system form a second resonator stack; and
wherein the first and second substructures of the first coupling system are electrically connected via an additional electrical connection.
16. The circuit of claim 15 , wherein the second coupling system comprises a first sub-structure and a second sub-structure;
wherein the first resonator of the second electroacoustic system and the first sub-structure of the second coupling system form a third resonator stack;
wherein the second resonator of the second electroacoustic system and the second sub-structure of the second coupling system form a fourth resonator stack; and
wherein the first and second substructures of the second coupling system are electrically connected via an additional electrical connection.
17. The circuit of claim 15 , wherein the first and second sub-structures of the first coupling system are capacitively or inductively coupled.
18. The circuit of claim 1 , wherein the first and second resonators of the first electroacoustic system are coupled vertically via the first coupling system, the first coupling system comprising a piezoelectric layer;
wherein the first and second resonators of the second electroacoustic system are coupled vertically via the second coupling system, the second coupling system comprising a piezoelectric layer; and
wherein the first coupling system and the second coupling system are adjacent and are acoustically coupled to each other in a transverse direction by a transverse acoustic wave mode.
19. The circuit of claim 1 , further comprising:
one or more additional electroacoustic systems, each additional electroacoustic system being in a corresponding branch;
wherein each additional electroacoustic system comprises series-connected resonators that are galvanically separated, and acoustically coupled via a coupling system; and
wherein additional electroacoustic systems are acoustically coupled via coupling systems and/or are electrically coupled.
20. The circuit of claim 1 , wherein an impedance of the first electric port differs from an impedance of the second electric port by a factor of two or more.
21. A circuit for use with bulk acoustic waves, the circuit comprising:
a first electroacoustic system in a first branch; and
a second electroacoustic system in a second branch;
wherein the first electroacoustic system comprises a first resonator and a second resonator that are in series in the first branch, that are galvanically separated, and that are acoustically coupled by a first coupling system;
wherein the second electroacoustic system comprises a first resonator and a second resonator that are connected in series in the second branch, that are galvanically separated, and that are acoustically coupled by a second coupling system;
wherein the first and second electroacoustic systems are acoustically coupled via the first and second coupling systems.
22. A component comprising:
the circuit of claim 21 ;
wherein resonators of the first and second electroacoustic systems operate with guided bulk acoustic waves;
wherein each resonator comprises a transducer and a piezoelectric layer arranged therebelow or thereabove; and
wherein each piezoelectric layer corresponds to a coupling system.
23. The component of claim 22 , wherein resonators of a same electroacoustic system that are acoustically coupled are arranged in a stack and are acoustically coupled vertically.
24. The component of claim 22 , wherein resonators of a same electroacoustic system that are acoustically coupled are arranged side-by-side in a longitudinal direction and are acoustically coupled in the longitudinal direction.
25. The component of claim 22 , wherein resonators of a same electroacoustic system that are acoustically coupled are arranged side-by-side in a transverse direction and are acoustically coupled in the transverse direction.
26. The circuit of claim 21 , wherein the first resonator, the first coupling system, and the second resonator of the first electroacoustic system are arranged in a first resonator stack; and
wherein the first resonator, the second coupling system, and the second resonator of the second electroacoustic system are arranged in a second resonator stack.
27. The circuit of claim 21 , further comprising:
one or more additional electroacoustic systems, each additional electroacoustic system being in a corresponding branch;
wherein each additional electroacoustic system comprises series-connected resonators that are galvanically separated, and acoustically coupled via a coupling system; and
wherein additional electroacoustic systems are acoustically coupled via coupling systems.
28. The circuit of claim 21 , wherein each resonator comprises a transducer comprising an interdigitated comb-like electrode on a piezoelectric substrate.
29. The circuit of claim 21 , wherein the first and second resonators of the first electroacoustic system are coupled vertically via the first coupling system, the first coupling system comprising a piezoelectric layer;
wherein the first and second resonators of the second electroacoustic system are coupled vertically via the second coupling system, the second coupling system comprising a piezoelectric layer; and
wherein the first coupling system and the second coupling system are adjacent and are acoustically coupled to each other in a transverse direction by a transverse acoustic wave mode.