WO2019044203A1 - 弾性波装置、高周波フロントエンド回路及び通信装置 - Google Patents
弾性波装置、高周波フロントエンド回路及び通信装置 Download PDFInfo
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- WO2019044203A1 WO2019044203A1 PCT/JP2018/026354 JP2018026354W WO2019044203A1 WO 2019044203 A1 WO2019044203 A1 WO 2019044203A1 JP 2018026354 W JP2018026354 W JP 2018026354W WO 2019044203 A1 WO2019044203 A1 WO 2019044203A1
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- Prior art keywords
- elastic wave
- laminated film
- film
- support substrate
- wave device
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Images
Classifications
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- H03H3/08—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of resonators or networks using surface acoustic waves
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- H03F2203/7209—Indexing scheme relating to gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal the gated amplifier being switched from a first band to a second band
Definitions
- the present invention relates to an elastic wave device, a high frequency front end circuit, and a communication device.
- Patent Document 1 discloses an example of an elastic wave device.
- the elastic wave device is provided on the support substrate, the support substrate, the laminated film including the piezoelectric thin film, the IDT electrode provided on the laminated film, and the support substrate and the laminated film.
- an external connection terminal electrically connected to the wiring electrode and the wiring electrode provided on the insulating layer and provided on the insulating film and electrically connected to the IDT electrode.
- the external connection terminal is provided in the region where the laminated film does not exist in plan view, the stress in bonding the external connection terminal is not directly applied to the laminated film, and the laminated film including the piezoelectric thin film It is believed that cracking and chipping are unlikely to occur.
- An object of the present invention is to provide an elastic wave device, a high frequency front end circuit, and a communication device in which cracking and chipping of the laminated film are less likely to occur and the supporting substrate and the laminated film are less likely to be separated.
- the elastic wave device is provided on a support substrate and the support substrate, and is provided inside of at least a part of the outer edge of the support substrate in plan view, and a piezoelectric thin film
- a connection electrode provided on the insulating layer and electrically connected to the connection electrode electrically connected to the IDT electrode and the connection electrode, and provided directly or indirectly on the connection electrode
- an external connection terminal provided on the support substrate and outside the region where the laminated film is provided in plan view, and the laminated film side of the support substrate Of the main surface of the Having a recess in a position of an outer edge of the laminated film case, the recess is covered with the insulating layer.
- the linear expansion coefficient of the laminated film and the linear expansion coefficient of the support substrate are different.
- the recess is formed entirely on the support substrate and outside the region where the laminated film is provided in plan view. In this case, the support substrate and the laminated film are more difficult to peel off.
- the recess is provided to surround the laminated film.
- the support substrate and the laminated film are more difficult to peel off.
- the supporting substrate is made of a material having a higher sound velocity of bulk wave propagating than the acoustic velocity of the elastic wave propagating the piezoelectric thin film
- the laminated film is The piezoelectric thin film is provided on the low sound velocity film, including a low sound velocity film in which the sound velocity of the bulk wave propagating is lower than the sound velocity of the elastic wave propagating in the piezoelectric thin film. In this case, the energy of the elastic wave can be effectively confined.
- the laminated film includes a high sound velocity film having a high sound velocity of a bulk wave propagating than the acoustic velocity of an elastic wave propagating the piezoelectric thin film;
- the low sound velocity film is provided on the high sound velocity film, and the piezoelectric thin film is provided on the low sound velocity film. It is done. In this case, the energy of the elastic wave can be effectively confined.
- the laminated film is a high acoustic impedance film having a relatively high acoustic impedance, and a low acoustic impedance film having a low acoustic impedance as compared to the high acoustic impedance film.
- the piezoelectric thin film is provided on the acoustic reflection layer. In this case, the energy of the elastic wave can be effectively confined.
- the elastic wave device directly or indirectly on the support substrate and outside the region where the laminated film is provided, in plan view.
- a supporting member provided with an opening surrounding the IDT electrode, a cover member provided on the supporting member to cover the opening, and connected to the connection electrode And an under bump metal layer penetrating the support member and the cover member, and the external connection terminal is indirectly provided on the connection electrode via the under bump metal layer.
- the IDT electrode is located in a hollow space surrounded by the support substrate, the support member, and the cover member.
- the external connection terminal is a bump provided directly on the connection electrode.
- the high frequency front end circuit of the present invention comprises an elastic wave device configured according to the present invention and a power amplifier.
- the communication device of the present invention comprises a high frequency front end circuit configured according to the present invention and an RF signal processing circuit.
- an elastic wave device it is possible to provide an elastic wave device, a high frequency front end circuit, and a communication device in which cracking and chipping of the laminated film are unlikely to occur and the supporting substrate and the laminated film are hardly peeled.
- FIG. 1 is a schematic cross-sectional view of an elastic wave device according to a first embodiment of the present invention.
- FIG. 2 is a schematic plan cross-sectional view of the elastic wave device according to the first embodiment of the present invention.
- FIG. 3 is a schematic enlarged plan view showing the vicinity of the elastic wave resonator according to the first embodiment of the present invention.
- FIG. 4 is an enlarged view of FIG. 1 showing the vicinity of the removal region of the support substrate in the first embodiment of the present invention.
- FIG. 5 is a schematic cross-sectional view of an elastic wave device according to a modification of the first embodiment of the present invention.
- FIG. 6 is a schematic enlarged cross-sectional view of an elastic wave device according to a second embodiment of the present invention.
- FIG. 7 is a schematic enlarged cross-sectional view of an elastic wave device according to a third embodiment of the present invention.
- FIG. 8 is a schematic enlarged cross-sectional view of an elastic wave device according to a fourth embodiment of the present invention.
- FIG. 9 is a schematic enlarged cross-sectional view of an elastic wave device according to a first modified example of the fourth embodiment of the present invention.
- FIG. 10 is a schematic enlarged cross-sectional view of an elastic wave device according to a second modified example of the fourth embodiment of the present invention.
- FIG. 11 is a schematic cross-sectional view of an elastic wave device according to a fifth embodiment of the present invention.
- FIG. 12 is a schematic cross-sectional view of an elastic wave device mounting structure according to a sixth embodiment of the present invention.
- FIG. 13 is a block diagram of a communication device having a high frequency front end circuit.
- FIG. 14 is a scanning type photomicrograph showing a part of an elastic wave device according to a third embodiment of the present invention
- FIG. 1 is a schematic cross-sectional view of an elastic wave device according to a first embodiment of the present invention.
- FIG. 2 is a schematic plan cross-sectional view of the elastic wave device according to the first embodiment.
- FIG. 1 is a cross-sectional view corresponding to a portion along the line II in FIG. The elastic wave resonator in FIG. 1 and FIG. 2 is shown by the schematic which added two diagonals to the rectangle.
- the elastic wave device 1 has a support substrate 2.
- the support substrate 2 is made of, for example, an appropriate material such as glass or Si.
- the laminated film 3 including the piezoelectric thin film 6 is provided on the support substrate 2. Specifically, the laminated film 3 is provided inside of at least a part of the outer edge of the support substrate 2 in plan view.
- the term “plan view” refers to viewing the elastic wave device 1 in the thickness direction of the support substrate 2 from the main surface side of the support substrate 2 on which the laminated film 3 is provided.
- the laminated film 3 includes a high sound velocity film 4 and a low sound velocity film 5 in addition to the piezoelectric thin film 6. More specifically, the high sound velocity film 4 is provided on the support substrate 2, the low sound velocity film 5 is provided on the high sound velocity film 4, and the piezoelectric thin film 6 is provided on the low sound velocity film 5. There is.
- the piezoelectric thin film 6 is made of a piezoelectric single crystal such as LiNbO 3 or LiTaO 3 .
- the piezoelectric thin film 6 may be made of appropriate piezoelectric ceramics.
- the high sound velocity film 4 is a film in which the sound velocity of the propagating bulk wave is higher than the sound velocity of the elastic wave propagating in the piezoelectric thin film 6.
- the high sound velocity film 4 is made of, for example, a material containing aluminum nitride, aluminum oxide, silicon carbide, silicon oxynitride, silicon, a DLC film, or a diamond as a main component.
- the material of the high sound velocity film 4 may be a material having a relatively high sound velocity.
- the low sound velocity film 5 is a film in which the sound velocity of the propagating bulk wave is lower than the sound velocity of the elastic wave propagating in the piezoelectric thin film 6.
- the low sound velocity film 5 is made of, for example, a material containing glass, silicon oxynitride, tantalum oxide or a compound obtained by adding fluorine or carbon or boron to silicon oxide as a main component.
- the material of the low sound velocity film 5 may be a material having a relatively low sound velocity.
- the laminated film 3 may include films other than the above-described films.
- an elastic wave resonator 13A On the piezoelectric thin film 6, an elastic wave resonator 13A, an elastic wave resonator 13B, and an elastic wave resonator 13C are configured.
- FIG. 3 is a schematic enlarged plan view showing the vicinity of the elastic wave resonator in the first embodiment. The wiring around the elastic wave resonator is omitted.
- An IDT electrode 14 is provided on the piezoelectric thin film 6. By applying an alternating voltage to the IDT electrode 14, an elastic wave is excited. A reflector 15A and a reflector 15B are provided on both sides of the IDT electrode 14 in the elastic wave propagation direction.
- the elastic wave resonator 13A is configured.
- the elastic wave resonator 13B and the elastic wave resonator 13C shown in FIG. 1 are similarly configured.
- the elastic wave resonator 13A, the elastic wave resonator 13B, and the elastic wave resonator 13C are electrically connected to one another by a plurality of wiring electrodes 16.
- the number of elastic wave resonators in the elastic wave device 1 and the configuration of connection are not particularly limited.
- the IDT electrode 14 may be provided indirectly on the piezoelectric thin film 6.
- the laminated film 3 may have a silicon oxide film on the piezoelectric thin film 6.
- the IDT electrode 14 is provided directly on the silicon oxide film. That is, the IDT electrode 14 may be provided on the laminated film 3.
- the support substrate 2 has a removal region R1 in which the laminated film 3 is partially removed in the region outside the region in which the IDT electrode is provided.
- FIG. 4 is an enlarged view of FIG. 1 showing the vicinity of the removal region of the support substrate in the first embodiment.
- the elastic wave device 1 of the present embodiment has an insulating layer 19 provided in the removal region R1 of the support substrate 2 and provided on the piezoelectric thin film 6.
- the insulating layer 19 has a first portion 19 a provided on the piezoelectric thin film 6 and a second portion 19 b located in the removal region R 1.
- the insulating layer 19 is not particularly limited, it is made of, for example, an organic insulator such as polyimide, epoxy resin or acrylic resin, or an inorganic insulator such as silicon oxide.
- the support substrate 2 has an outer edge contact portion X located at the outer edge of the portion in contact with the laminated film 3.
- a recess 12 is provided in the removal region R1 of the support substrate 2 so as to be continuous with the outer edge contact portion X.
- the recess 12 includes a connecting portion 2a that connects the outer edge contact portion X and the portion where the removal region R1 is lowered.
- the portion where the removal area R1 connected to the connection portion 2a is low is the bottom of the recess 12 in the present embodiment.
- the recess 12 includes a portion where the removal region R1 is lowered at a portion directly connected to the outer edge contact portion X.
- the recess 12 includes the entire connection portion 2 a.
- the connection portion 2 a is one of the surfaces in the recess 12.
- the concave portion 12 can be provided, for example, by forming a resist layer on the laminated film 3 and forming a resist layer on the portion of the removal region R1 where the concave portion 12 is not provided, and then etching the support substrate 2.
- the recess 12 is provided so as to surround the laminated film 3.
- the connection portion 2a is continuous with the entire outer edge contact portion X.
- the recess 12 may not surround the laminated film 3, and the connection portion 2 a may be connected to at least a part of the outer edge contact portion X.
- the recess 12 is inclined with respect to the thickness direction of the support substrate 2 and has an inner surface 12 b connected to the connection portion 2 a.
- the insulating layer 19 extends to the outer edge contact portion X and extends into the recess 12.
- the structure of the recessed part 12 is not limited above,
- the recessed part 12 may have surfaces other than the connection part 2a and the inner surface 12b.
- the bottom portion of the recess 12 is a portion where the connection portion 2 a and the inner surface 12 b are connected in the elastic wave device 1.
- the part in which surfaces other than the connection part 2a and the inner surface 12b were connected may be a bottom part.
- the height of the portion other than the portion where the concave portion 12 of the removal region R1 of the support substrate 2 is provided is the same as the height of the portion in contact with the laminated film 3.
- the height is a position in a direction parallel to the thickness direction of the support substrate 2.
- the supporting substrate 2 side is lower than the piezoelectric thin film 6 side.
- the elastic wave device 1 has a connection electrode 17 connected to the elastic wave resonator 13A shown in FIG. As shown in FIG. 4, the connection electrode 17 extends from above the piezoelectric thin film 6 onto the first portion 19 a of the insulating layer 19 and further onto the second portion 19 b.
- connection electrode 17 reaches the removal region R1 of the support substrate 2.
- the connection electrode 17 is indirectly provided on the support substrate 2 via the insulating layer 19.
- the connection electrode 17 may be provided directly on the support substrate 2.
- the support substrate 2 is made of a material having a low electric resistance, it is preferable that the support substrate 2 be provided on the insulating layer 19. As a result, the electrical characteristics of the elastic wave device 1 do not easily deteriorate.
- a support member 7 is provided in the removal area R ⁇ b> 1 of the support substrate 2.
- the support member 7 has an opening 7a surrounding the elastic wave resonator 13A, the elastic wave resonator 13B, and the elastic wave resonator 13C.
- the support member 7 is provided so as to cover a part of the connection electrode 17.
- the support member 7 is made of an appropriate resin.
- a cover member 8 is provided on the support member 7 so as to cover the opening 7 a.
- An under bump metal layer 9 is provided to penetrate the support member 7 and the cover member 8.
- the surface on the piezoelectric thin film 6 side of the under bump metal layer 9 is connected to the connection electrode 17.
- Bumps 10 as external connection terminals are provided on the under bump metal layer 9.
- the bump 10 is indirectly provided on the connection electrode 17 via the under bump metal layer 9.
- the bumps 10 are provided on the support substrate 2 in a plan view and outside the region where the laminated film 3 is provided.
- the external connection terminal in the present invention is not limited to a bump, and may be a member for electrically connecting the elastic wave device 1 to the outside.
- the external connection terminal may include an under bump metal layer in addition to the bumps.
- An elastic wave resonator 13A, an elastic wave resonator 13B and an elastic wave resonator 13C are located in a hollow space surrounded by the support substrate 2, the support member 7 and the cover member 8.
- the elastic wave resonator 13A, the elastic wave resonator 13B, and the elastic wave resonator 13C are electrically connected to the outside through the connection electrode 17, the under bump metal layer 9, and the bumps 10.
- the elastic wave device 1 has a WLP (Wafer Level Package) structure.
- the elastic wave device 1 is not limited to the above, and may be, for example, an elastic wave device included in a CSP (Chip Size Package) structure.
- the features of the present embodiment are provided on the support substrate 2 and the support substrate 2 and provided on the inner side of at least a part of the outer edge of the support substrate 2 in plan view, and the piezoelectric thin film 6 Insulating layer provided on the laminated film 3 from the supporting substrate 2 and provided on the laminated substrate 3, the IDT electrode 14 provided on the laminated film 3, the supporting substrate 2 and the laminated film 3 19 and a connection electrode 17 provided on the insulating layer 19 and electrically connected to the IDT electrode, and electrically connected to the connection electrode 17 directly or indirectly on the connection electrode 17 And an external connection terminal provided on the support substrate 2 and outside the region where the laminated film 3 is provided in plan view. And the main surface of the support substrate 2 on the laminated film 3 side is Has a recess 12 in the position of the outer edge of the laminated film 3 when facing is that the recess 12 is covered with the insulating layer 19.
- the main surface on the laminated film 3 side of the support substrate 2 has the recess 12 at the position of the outer edge of the laminated film 3 in plan view, and the recess 12 is covered by the insulating layer 19, for example Even if thermal stress is applied when the linear expansion coefficients of the support substrate 2 and the laminated film 3 are different, the insulating layer 19 covers the vicinity of the outer edge contact portion X in the recess 12 where the thermal stress is most applied. Therefore, the thermal stress is relaxed in the vicinity of the outer edge contact portion X to which the thermal stress is most applied, and the support substrate 2 and the laminated film 3 are hardly peeled off.
- the bumps 10 as external connection terminals are provided in a region where the laminated film 3 does not exist in plan view, the stress when bonding the bumps 10 is not directly applied to the laminated film 3, and the piezoelectric thin film 6 is not It is possible to prevent the occurrence of cracking or chipping of the laminated film 3 including the above.
- the main surface on the laminated film 3 side of the support substrate 2 has a recess 12 at the position of the outer edge of the laminated film 3 in plan view, and the recess 12 is covered by the insulating layer 19.
- the following is the configuration 1) and 2).
- the concave portion 12 is provided on the support substrate 2 so as to include the connection portion 2a connected to the outer edge contact portion X.
- the insulating layer 19 reaches the outer edge contact portion X and the connection portion 2a.
- the elastic wave device 1 has the laminated film 3 and the support substrate 2 includes the removal region R1.
- the support substrate 2 and the laminated film 3 are not easily peeled off even when stress is applied. Furthermore, since the insulating layer 19 extends on the piezoelectric thin film 6, displacement of the laminated film 3 in the direction away from the support substrate 2 can be suppressed. Therefore, peeling between the support substrate 2 and the laminated film 3 can be effectively suppressed.
- the recess 12 is preferably provided so as to surround the laminated film 3 as in the present embodiment.
- the entire outer edge contact portion X can be covered with the insulating layer 19, and the support substrate 2 and the laminated film 3 are more difficult to peel off.
- the insulating layer 19 preferably extends to the bottom of the recess 12. Thereby, the area in which the insulating layer 19 contacts the connection portion 2a can be increased, and the adhesion between the support substrate 2 and the insulating layer 19 can be enhanced. Therefore, the support substrate 2 and the laminated film 3 are more difficult to peel off.
- the end face of the first portion 19a of the insulating layer 19 including the portion in contact with the piezoelectric thin film 6 is inclined with respect to the thickness direction.
- the vicinity of the portion from the second portion 19 b to the first portion 19 a of the insulating layer 19 is also inclined.
- the connection electrode 17 is also inclined in the vicinity of the portion from above the piezoelectric thin film 6 to above the insulating layer 19, and extends from above the second portion 19b of the insulating layer 19 to above the first portion 19a. It is inclined in the vicinity.
- a portion from on the second portion 19 b of the insulating layer 19 to on the first portion 19 a is referred to as a third portion.
- the thickness of the portion provided on the third portion of the connection electrode 17 is the same as that of the portions provided on the first portion 19 a and the second portion 19 b of the connection electrode 17. It tends to be thinner than the thickness.
- the third portion since the third portion is inclined, the thickness of the portion provided in the third portion of the connection electrode 17 is thicker than in the case where the third portion is not inclined. can do. Therefore, disconnection of the connection electrode 17 is unlikely to occur.
- the insulating layer 19 and the connection electrode 17 may not necessarily be inclined as described above.
- the inner surface 12 b of the recess 12 is preferably inclined so as to approach the connection portion 2 a with respect to the thickness direction of the support substrate 2.
- the direction of shear stress applied between the removal region R1 and the insulating layer 19 in the support substrate 2 is not parallel to the direction in which the inner surface 12b extends. Therefore, by providing the concave portion 12 having the inner surface 12 b, the influence of the shear stress on the portion where the support substrate 2 and the laminated film 3 are in contact can be alleviated. Therefore, the support substrate 2 and the laminated film 3 are more difficult to peel off.
- the inner surface 12b is more preferably directly connected to the connection portion 2a as in the present embodiment.
- the volume of the recess 12 can be reduced, and the inclination of the surface of the insulating layer 19 on the connection electrode 17 side is unlikely to be a steep angle. Therefore, the disconnection of the connection electrode 17 can be suppressed, and the support substrate 2 and the laminated film 3 do not easily peel off.
- connection portion 2 a of the recess 12 extends in parallel with the thickness direction of the support substrate 2.
- the connection portion 2a may extend from the outer edge contact portion X side in the direction in which the removal region R1 is lowered, and may be inclined with respect to the thickness direction of the support substrate 2.
- the connection portion 2a and the inner surface 12b may include curved surface portions.
- the shape of the cross section of the recess 12 shown in FIG. 4 is a triangle in this embodiment.
- the shape of the cross section of the recessed part 12 is not limited above, For example, a rectangle, a trapezoid, or fan shape etc. may be sufficient.
- the support substrate 2 is made of, for example, a relatively high sound velocity material such as Si
- the high sound velocity film 4 may not be provided. Also in this case, the same effect as described above can be obtained.
- FIG. 5 is a schematic cross-sectional view of an elastic wave device according to a modification of the first embodiment of the present invention.
- the support substrate 2 is made of a material similar to the above-described high sound velocity film, in which the sound velocity of the bulk wave propagating is higher than the sound velocity of the elastic wave propagating the piezoelectric thin film 6.
- the piezoelectric thin film 6 is provided on the low sound velocity film 5.
- the laminated film 73 does not include a high sound velocity film. Also in this case, the energy of the elastic wave can be effectively confined, and the support substrate 2 and the laminated film 73 do not easily peel off.
- FIG. 6 is a schematic enlarged cross-sectional view of an elastic wave device according to a second embodiment. 6 shows a cross section corresponding to the cross section shown in FIG. The same applies to each schematically enlarged cross-sectional view described later.
- the present embodiment differs from the first embodiment in that the entire removal region R2 is lowered, and the connection portion 22a is continuous with the entire outer edge contact portion X.
- the elastic wave device of the present embodiment has the same configuration as the elastic wave device 1 of the first embodiment except for the above point.
- connection portion 22 a in the present embodiment is a step portion between the portion in contact with the laminated film 3 of the support substrate 22 and the removal region R2.
- the insulating layer 19 extends to the outer edge contact portion X and the connection portion 22a. Therefore, also in the present embodiment, since the outer edge contact portion X is covered by the insulating layer 19, the support substrate 22 and the laminated film 3 do not easily peel off.
- the concave portion of the support substrate includes the lowered portion in the case where the support substrate is provided with the step portion and the portion of the support substrate is lowered. Even when the lower portion of the support substrate extends from the step portion of the support substrate to the outer edge of the support substrate, the lower portion is a recess. In the second embodiment shown in FIG. 6, the recess is formed entirely on the support substrate 22 in the plan view and outside the region where the laminated film 3 is provided.
- the support substrate 2 may be etched.
- FIG. 7 is a schematic enlarged cross-sectional view of an elastic wave device according to a third embodiment.
- the present embodiment differs from the first embodiment in that the support substrate 32 has a recess 12 and the entire removal area R3 is lowered as in the second embodiment.
- the elastic wave device of the present embodiment has the same configuration as the elastic wave device 1 of the first embodiment except for the above point.
- the recess 12 is provided so as to include a part of the connection portion 32 a.
- the connection portion 32 a has a portion corresponding to the surface in the recess 12 and a portion corresponding to the above-described step portion similar to the second embodiment.
- the insulating layer 19 extends to the outer edge contact portion X and the connection portion 32 a. More specifically, the insulating layer 19 extends to a portion corresponding to the stepped portion of the connection portion 32 a and a portion corresponding to the surface in the recess 12. Accordingly, the outer edge contact portion X is covered with the insulating layer 19 and the adhesion between the support substrate 32 and the insulating layer 19 can be further enhanced, so the support substrate 2 and the laminated film 3 are further peeled off. hard.
- the direction in which the portion corresponding to the stepped portion in the connecting portion 32 a extends may be different from the direction in which the portion corresponding to the surface in the recess 12 extends.
- the configuration of the third embodiment is shown by the scanning type photomicrograph of FIG. It can be seen that the insulating layer extends to the surface in the step portion and the recessed portion and extends onto the piezoelectric thin film.
- FIG. 8 is a schematic enlarged cross-sectional view of an elastic wave device according to a fourth embodiment.
- the present embodiment differs from the first embodiment in that the laminated film 43 includes the acoustic reflection layer 43A.
- the elastic wave device of the present embodiment has the same configuration as the elastic wave device 1 of the first embodiment except for the above point.
- the acoustic reflection layer 43A has a plurality of high acoustic impedance films with relatively high acoustic impedance, and a plurality of low acoustic impedance films with low acoustic impedance as compared to the high acoustic impedance film. More specifically, as shown in FIG. 8, a high acoustic impedance film 44a and a high acoustic impedance film 44b, and a low acoustic impedance film 45a and a low acoustic impedance film 45b are alternately stacked.
- the number of layers of the high acoustic impedance film and the low acoustic impedance film is not particularly limited.
- the piezoelectric thin film 6 is provided on the acoustic reflection layer 43A. Thereby, the energy of the elastic wave can be effectively confined.
- the outer edge contact portion X is covered by the insulating layer 19, the support substrate 2 and the laminated film 43 do not easily peel off.
- the form of the support substrate 2 and the connection portion 2a is not limited to the same as that of the first embodiment. Also in the case of the first modified example and the second modified example described below, it is difficult for the support substrate and the laminated film 43 to peel off.
- FIG. 9 is a schematic enlarged cross-sectional view of an elastic wave device according to a first modification of the fourth embodiment.
- the entire removal region R2 is lowered, and the connecting portion 22a is continuous with the entire outer edge contact portion X.
- FIG. 10 is a schematic enlarged cross-sectional view of an elastic wave device according to a second modification of the fourth embodiment.
- the support substrate 32 of the present modification has the recess 12 and the entire removal area R3 is low.
- FIG. 11 is a schematic cross-sectional view of an elastic wave device according to a fifth embodiment.
- FIG. 11 shows a cross section corresponding to the cross section shown in FIG. The same applies to FIG. 12 described later.
- the elastic wave device 51 of the present embodiment differs from that of the first embodiment in that the bumps 10 are provided directly on the connection electrode 17. Also in the present embodiment, as in the first embodiment, the support substrate 2 and the laminated film 3 do not easily peel off.
- FIG. 12 is a schematic cross-sectional view of an elastic wave device mounting structure according to a sixth embodiment.
- the elastic wave device mounting structure 60 has a mounting substrate 62.
- the elastic wave device 51 of the fifth embodiment is mounted on the mounting substrate 62. More specifically, a plurality of connection terminals 68 are provided on the mounting substrate 62. The bumps 10 of the elastic wave device 51 are joined to the connection terminals 68, respectively.
- a sealing resin 69 is provided on the mounting substrate 62 so as to cover the elastic wave device 51.
- the elastic wave device 51 is mounted on the mounting substrate 62.
- the elastic wave device mounting structure 60 has a CSP structure.
- the elastic wave device 51 in the elastic wave device mounting structure 60 has the configuration of the fifth embodiment, the supporting substrate 2 and the laminated film 3 are not easily peeled off also in the present embodiment.
- the elastic wave device of each of the above embodiments can be used as a duplexer of a high frequency front end circuit or the like. An example of this is described below.
- FIG. 13 is a block diagram of a communication device and a high frequency front end circuit. Note that, in the same drawing, each component connected to the high frequency front end circuit 230, for example, the antenna element 202 and the RF signal processing circuit (RFIC) 203 are also illustrated.
- the high frequency front end circuit 230 and the RF signal processing circuit 203 constitute a communication device 240.
- the communication device 240 may include a power supply, a CPU, and a display.
- the high frequency front end circuit 230 includes a switch 225, duplexers 201A and 201B, filters 231 and 232, low noise amplifier circuits 214 and 224, and power amplifier circuits 234a, 234b, 244a and 244b.
- the high frequency front end circuit 230 and the communication device 240 in FIG. 13 are an example of the high frequency front end circuit and the communication device, and the present invention is not limited to this configuration.
- the duplexer 201A has filters 211 and 212.
- the duplexer 201B includes filters 221 and 222.
- the duplexers 201A and 201B are connected to the antenna element 202 via the switch 225.
- the elastic wave device may be a duplexer 201A or 201B, or may be a filter 211, 212, 221 or 222.
- the elastic wave device is also applied to a multiplexer including three or more filters, for example, a triplexer in which antenna terminals of three filters are shared, a hexaplexer in which antenna terminals of six filters are shared. Can.
- the elastic wave device includes an elastic wave resonator, a filter, a duplexer, and a multiplexer including three or more filters.
- the multiplexer is not limited to the configuration including both the transmission filter and the reception filter, and may be configured to include only the transmission filter or only the reception filter.
- the switch 225 connects the antenna element 202 and a signal path corresponding to a predetermined band in accordance with a control signal from a control unit (not shown), and is formed of, for example, a single pole double throw (SPDT) type switch .
- SPDT single pole double throw
- the number of signal paths connected to the antenna element 202 is not limited to one, and may be plural. That is, the high frequency front end circuit 230 may support carrier aggregation.
- the low noise amplifier circuit 214 is a reception amplifier circuit that amplifies a high frequency signal (here, a high frequency received signal) that has passed through the antenna element 202, the switch 225, and the duplexer 201A, and outputs the amplified signal to the RF signal processing circuit 203.
- the low noise amplifier circuit 224 is a reception amplifier circuit that amplifies a high frequency signal (here, a high frequency received signal) that has passed through the antenna element 202, the switch 225, and the duplexer 201B, and outputs the amplified signal to the RF signal processing circuit 203.
- the power amplifier circuits 234 a and 234 b are transmission amplifier circuits that amplify a high frequency signal (here, a high frequency transmission signal) output from the RF signal processing circuit 203 and output the amplified high frequency signal to the antenna element 202 via the duplexer 201 A and the switch 225.
- the power amplifier circuits 244 a and 244 b are transmission amplifier circuits that amplify a high frequency signal (here, a high frequency transmission signal) output from the RF signal processing circuit 203 and output the amplified high frequency signal to the antenna element 202 via the duplexer 201 B and the switch 225. .
- the RF signal processing circuit 203 performs signal processing on the high frequency reception signal input from the antenna element 202 via the reception signal path by down conversion or the like, and outputs the reception signal generated by the signal processing. Further, the RF signal processing circuit 203 performs signal processing of the input transmission signal by up conversion or the like, and outputs a high frequency transmission signal generated by the signal processing to the power amplifier circuits 234a, 234b, 244a, 244b.
- the RF signal processing circuit 203 is, for example, an RFIC.
- the communication device may include a BB (baseband) IC. In this case, the BBIC processes the received signal processed by the RFIC. Also, the BBIC processes the transmission signal and outputs it to the RFIC.
- the reception signal processed by the BBIC or the transmission signal before the signal processing by the BBIC is, for example, an image signal or an audio signal.
- the high-frequency front end circuit 230 may include a duplexer according to a modification of the duplexers 201A and 201B instead of the duplexers 201A and 201B.
- the filters 231 and 232 in the communication device 240 are connected between the RF signal processing circuit 203 and the switch 225 without passing through the low noise amplifier circuits 214 and 224 and the power amplifier circuits 234a, 234b, 244a and 244b.
- the filters 231 and 232 are also connected to the antenna element 202 via the switch 225 in the same manner as the duplexers 201A and 201B.
- the elastic wave device includes the elastic wave resonator, the filter, the duplexer, the multiplexer including three or more filters, and the like. It is difficult for the supporting substrate and the laminated film including the piezoelectric thin film to be separated, and cracking and chipping of the laminated film are less likely to occur.
- the elastic wave device, the high frequency front end circuit, and the communication device according to the embodiments of the present invention have been described above by using the embodiments and the modifications thereof, but the present invention relates to any component in the embodiments and the modifications Another embodiment realized by combining the above, a variation obtained by applying various modifications to those skilled in the art without departing from the spirit of the present invention with respect to the above embodiment, a high frequency front end circuit according to the present invention
- the present invention also includes various devices incorporating a communication device.
- the present invention can be widely used in communication devices such as cellular phones as elastic wave resonators, filters, duplexers, multiplexers applicable to multiband systems, front end circuits, and communication devices.
- Low acoustic impedance film 51 ... Elastic wave device 60 . Elastic wave device Mounting structure 62 ... mounting substrate 68 ... connection terminal 69 ... sealing resin 73 ... laminated film 201A, 201B ... duplexer 202 ... antenna element 203 ... RF signal processing circuit 211, 21 ... Filter 214 ... Low noise amplifier circuit 221, 222 ... Filter 224 ... Low noise amplifier circuit 225 ... Switch 230 ... High frequency front end circuit 231, 232 ... Filter 234a, 234b ... Power amplifier circuit 240 ... Communication device 244a, 244b ... Power amplifier circuit R1 ⁇ R3 ... Removal area X ... Outer edge contact area
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Abstract
Description
2…支持基板
2a…接続部
3…積層膜
4…高音速膜
5…低音速膜
6…圧電薄膜
7…支持部材
7a…開口部
8…カバー部材
9…アンダーバンプメタル層
10…バンプ
12…凹部
12b…内面
13A~13C…弾性波共振子
14…IDT電極
15A,15B…反射器
16…配線電極
17…接続電極
19…絶縁層
19a,19b…第1,第2の部分
22…支持基板
22a…接続部
32…支持基板
32a…接続部
43…積層膜
43A…音響反射層
44a,44b…高音響インピーダンス膜
45a,45b…低音響インピーダンス膜
51…弾性波装置
60…弾性波装置実装構造体
62…実装基板
68…接続端子
69…封止樹脂
73…積層膜
201A,201B…デュプレクサ
202…アンテナ素子
203…RF信号処理回路
211,212…フィルタ
214…ローノイズアンプ回路
221,222…フィルタ
224…ローノイズアンプ回路
225…スイッチ
230…高周波フロントエンド回路
231,232…フィルタ
234a,234b…パワーアンプ回路
240…通信装置
244a,244b…パワーアンプ回路
R1~R3…除去領域
X…外縁接触部
Claims (11)
- 支持基板と、
前記支持基板上に設けられており、平面視した場合に前記支持基板の外縁の少なくとも一部よりも内側に設けられており、かつ、圧電薄膜を含む積層膜と、
前記積層膜上に設けられているIDT電極と、
前記支持基板上及び前記積層膜上に設けられており、前記支持基板上から前記積層膜上に至っている絶縁層と、
前記絶縁層上に設けられており、前記IDT電極と電気的に接続されている接続電極と、
前記接続電極と電気的に接続されており、前記接続電極上に直接的にまたは間接的に設けられており、かつ、平面視した場合に前記支持基板上であって前記積層膜が設けられている領域の外側に設けられている、外部接続端子と、
を備え、
前記支持基板における前記積層膜側の主面は、平面視した場合に前記積層膜の外縁の位置に凹部を有し、
前記凹部は、前記絶縁層によって覆われている、弾性波装置。 - 前記積層膜の線膨脹係数と、前記支持基板の線膨張係数とは異なる、請求項1に記載の弾性波装置。
- 前記凹部が、平面視した場合に前記支持基板上であって前記積層膜が設けられている領域の外側の全体に形成されている、請求項1または2に記載の弾性波装置。
- 前記凹部が前記積層膜を囲むように設けられている、請求項1~3のいずれか1項に記載の弾性波装置。
- 前記支持基板が、前記圧電薄膜を伝搬する弾性波の音速よりも伝搬するバルク波の音速が高い材料からなり、
前記積層膜が、前記圧電薄膜を伝搬する弾性波の音速よりも伝搬するバルク波の音速が低い低音速膜を含み、
前記低音速膜上に前記圧電薄膜が設けられている、請求項1~4のいずれか1項に記載の弾性波装置。 - 前記積層膜が、前記圧電薄膜を伝搬する弾性波の音速よりも伝搬するバルク波の音速が高い高音速膜と、前記圧電薄膜を伝搬する弾性波の音速よりも伝搬するバルク波の音速が低い低音速膜と、を含み、
前記高音速膜上に前記低音速膜が設けられており、
前記低音速膜上に前記圧電薄膜が設けられている、請求項1~4のいずれか1項に記載の弾性波装置。 - 前記積層膜が、音響インピーダンスが相対的に高い高音響インピーダンス膜と、前記高音響インピーダンス膜に比べて音響インピーダンスが低い低音響インピーダンス膜と、を有する音響反射層を含み、
前記音響反射層上に前記圧電薄膜が設けられている、請求項1~4のいずれか1項に記載の弾性波装置。 - 平面視した場合に、前記支持基板上であって前記積層膜が設けられている領域の外側の領域に直接的にまたは間接的に設けられており、前記IDT電極を囲んでいる開口部を有する支持部材と、
前記支持部材上に、前記開口部を覆うように設けられているカバー部材と、
前記接続電極に接続されるように、前記支持部材及び前記カバー部材を貫通しているアンダーバンプメタル層と、
をさらに備え、
前記外部接続端子が、前記接続電極上に前記アンダーバンプメタル層を介して間接的に設けられているバンプであり、
前記支持基板、前記支持部材及び前記カバー部材により囲まれた中空空間内に、前記IDT電極が位置している、請求項1~7のいずれか1項に記載の弾性波装置。 - 前記外部接続端子が、前記接続電極上に直接的に設けられているバンプである、請求項1~7のいずれか1項に記載の弾性波装置。
- 請求項1~9のいずれか1項に記載の弾性波装置と、
パワーアンプと、
を備える、高周波フロントエンド回路。 - 請求項10に記載の高周波フロントエンド回路と、
RF信号処理回路と、
を備える、通信装置。
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CN201880054861.4A CN111066244B (zh) | 2017-08-29 | 2018-07-12 | 弹性波装置、高频前端电路以及通信装置 |
JP2019539036A JP6791390B2 (ja) | 2017-08-29 | 2018-07-12 | 弾性波装置、高周波フロントエンド回路及び通信装置 |
US16/801,360 US11588468B2 (en) | 2017-08-29 | 2020-02-26 | Acoustic wave device, radio-frequency front-end circuit, and communication apparatus |
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WO2021220889A1 (ja) * | 2020-04-27 | 2021-11-04 | 株式会社村田製作所 | 弾性波装置 |
WO2022075311A1 (ja) * | 2020-10-09 | 2022-04-14 | 株式会社村田製作所 | 弾性波装置 |
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US20200195219A1 (en) | 2020-06-18 |
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US11588468B2 (en) | 2023-02-21 |
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