WO2009153916A1 - 弾性境界波装置 - Google Patents
弾性境界波装置 Download PDFInfo
- Publication number
- WO2009153916A1 WO2009153916A1 PCT/JP2009/002193 JP2009002193W WO2009153916A1 WO 2009153916 A1 WO2009153916 A1 WO 2009153916A1 JP 2009002193 W JP2009002193 W JP 2009002193W WO 2009153916 A1 WO2009153916 A1 WO 2009153916A1
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- Prior art keywords
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- dielectric
- connection conductor
- acoustic wave
- wave device
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- 239000004020 conductor Substances 0.000 claims abstract description 86
- 239000000758 substrate Substances 0.000 claims abstract description 42
- 229910052751 metal Inorganic materials 0.000 claims description 27
- 239000002184 metal Substances 0.000 claims description 27
- 229920005989 resin Polymers 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- 239000003989 dielectric material Substances 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims 1
- 239000003990 capacitor Substances 0.000 abstract description 5
- 238000010897 surface acoustic wave method Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 229910013641 LiNbO 3 Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 230000001902 propagating effect Effects 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 1
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- 229910052802 copper Inorganic materials 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/05—Holders; Supports
- H03H9/058—Holders; Supports for surface acoustic wave devices
- H03H9/059—Holders; Supports for surface acoustic wave devices consisting of mounting pads or bumps
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/05—Holders; Supports
- H03H9/10—Mounting in enclosures
- H03H9/1064—Mounting in enclosures for surface acoustic wave [SAW] devices
- H03H9/1071—Mounting in enclosures for surface acoustic wave [SAW] devices the enclosure being defined by a frame built on a substrate and a cap, the frame having no mechanical contact with the SAW device
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
- H03H9/14538—Formation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6423—Means for obtaining a particular transfer characteristic
- H03H9/6433—Coupled resonator filters
- H03H9/6483—Ladder SAW filters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6489—Compensation of undesirable effects
- H03H9/6493—Side lobe suppression
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/11—Manufacturing methods
Definitions
- the present invention relates to a boundary acoustic wave device in which an electrode structure is formed at the interface between a piezoelectric substrate and a dielectric, and more particularly to a boundary acoustic wave device in which a filter having a ladder circuit configuration is configured.
- FIG. 10 is a circuit diagram showing a surface acoustic wave filter device described in Patent Document 1 below.
- the surface acoustic wave filter device 1001 has a series arm connecting an input terminal 1002 and an output terminal 1003.
- series arm resonators 1004 to 1006 are connected in series with each other.
- a plurality of parallel arms are connected to the serial arm.
- Each parallel arm has a parallel arm resonator 1007.
- Inductances L are connected between the input terminal 1002 and the series arm resonator 1004 and between the series arm resonator 1006 and the output terminal 1003, respectively.
- An inductance L is also connected to each end of each parallel arm resonator 1007.
- These inductances L represent inductance components due to the wiring between the surface acoustic wave resonator chip and the package on which the chip is mounted, a connection portion, a bonding wire, or the like.
- 10 represents an inductance component from the connection pad on the package to the ground electrode of the device on which the surface acoustic wave filter device 1001 is mounted, that is, the ground electrodes 1008 and 1009 in FIG.
- the capacitor means 1010 is connected between the end of the parallel arm closest to the input terminal 1002 and the end of the parallel arm closest to the output terminal 1003.
- the inductance component Lp By making the inductance component Lp extremely small and selecting an appropriate value for the inductance component L, it is possible to increase the attenuation on the lower side of the pass band while ensuring the pass band width.
- the boundary acoustic wave filter device since the surface acoustic wave filter device can be further reduced in size, the boundary acoustic wave filter device has attracted attention in recent years.
- the amount of attenuation outside the passband can be increased by providing the capacitance means 1010.
- such a configuration is effective when a structure having a large inductance such as a bonding wire is connected to the ground side terminal of the parallel arm resonator of the ladder filter.
- the electrode structure for exciting the boundary acoustic wave is disposed at the interface between the piezoelectric body and the dielectric, and is embedded in the boundary acoustic wave device chip. It is unnecessary. Therefore, the connection wiring does not have a large inductance component. Therefore, the technique of enlarging the out-of-band attenuation amount by using the inductance component L and the capacitance means 1010 described in Patent Document 1 is not effective in the boundary acoustic wave device.
- the object of the present invention is to overcome the above-mentioned drawbacks of the prior art, and in the boundary acoustic wave device having a ladder type circuit configuration, it is possible to increase the attenuation outside the passband, and therefore, it is advantageous in reducing the size. It is to provide a boundary wave device.
- a piezoelectric substrate a first dielectric formed on the piezoelectric substrate, and an electrode structure provided at an interface between the piezoelectric substrate and the first dielectric.
- the structure is in series.
- a parallel arm resonator connected between the arm and the ground potential; a plurality of ground wires connected to ends of the plurality of parallel arms connected to the ground potential; and a plurality of ground wires.
- the signal wiring and the ground connection conductor cross three-dimensionally through the first dielectric.
- a boundary acoustic wave device is provided, wherein all the ground pads are electrically connected.
- the signal wiring is formed on the piezoelectric substrate
- the ground connection conductor is formed on the first dielectric
- the first dielectric is formed on the piezoelectric substrate.
- the signal wiring and the ground connection conductor are three-dimensionally crossed via the first dielectric, and are electrically connected to the at least two ground pads via a via-hole conductor penetrating therethrough.
- the use of a three-dimensional intersection can increase the wiring density and further reduce the size of the boundary acoustic wave device.
- the ground connection conductor is electrically connected to all the ground pads.
- all the ground pads are electrically connected by the ground connection conductor, so that the ground is surely strengthened.
- a ground wiring for electrically connecting the ground pads to the piezoelectric substrate is not necessarily required, so that the electrode structure on the piezoelectric substrate is simplified. Can also be achieved.
- a capacitance is formed in a portion where the ground connection conductor and the ground wiring are opposed to each other via the first dielectric. ing. In this case, since the ground connection conductor is capacitively coupled to the ground potential, the ground can be further enhanced.
- a part of the signal wiring is formed on the first dielectric, and via a via-hole conductor penetrating the first dielectric, It is electrically connected to the other part of the signal wiring, the ground connection conductor is formed on the piezoelectric substrate, and the part of the signal wiring and the ground connection conductor include the first dielectric. There are three-dimensional intersections.
- the ladder filter includes a first filter circuit section disposed on the input end side and a second filter circuit disposed on the output end side. At least one series arm resonator connected to the series arm, and at least one parallel arm resonator arranged in the at least one parallel arm. And the ends of the first filter circuit portion and the second filter circuit portion connected to the ground potential are electrically connected by the ground connection conductor. In this case, the ground of the boundary acoustic wave device can be strengthened more reliably.
- a through hole is formed in the first dielectric so as to expose the ground pad, and the via hole is formed on an inner peripheral surface of the through hole.
- a conductor is formed, and an under bump metal layer filled in the through hole, and a metal bump provided on the under bump metal layer are further provided.
- the boundary acoustic wave device can be easily surface-mounted on a circuit board or the like by a flip chip bonding method using a metal bump.
- a sound absorbing resin layer provided so as to cover a part of the ground connection conductor or the signal wiring formed on the first dielectric is provided. Furthermore, it is provided.
- the sound-absorbing resin can more reliably absorb waves leaking to the dielectric surface, thereby improving the attenuation characteristics.
- a second dielectric provided so as to cover a part of the ground connection conductor or the signal wiring formed on the first dielectric.
- the body is further equipped.
- boundary acoustic wave device between the first dielectric and the ground connection conductor or a part of the signal wiring formed on the first dielectric.
- a second dielectric provided on the substrate is further provided.
- all the ground pads are electrically connected by the ground connection conductor provided on the dielectric or the piezoelectric substrate, so that each ground pad is connected to the ground potential.
- the ground connection conductor provided on the dielectric or the piezoelectric substrate, so that each ground pad is connected to the ground potential.
- the ground is strengthened by the ground connection conductor provided on the dielectric or the piezoelectric substrate, it is not necessary to provide an inductance or a capacitance by connecting an external element. Accordingly, the out-of-band attenuation can be increased without impairing the miniaturization.
- FIG. 1A is a schematic plan view of a boundary acoustic wave device according to a first embodiment of the present invention
- FIG. 1B is a schematic front sectional view
- FIG. It is a partial notch front sectional drawing shown.
- FIG. 2 is a plan view of the boundary acoustic wave device according to the first embodiment of the present invention.
- FIG. 3 is a schematic diagram showing an electrode structure of a 1-port boundary acoustic wave resonator constituting a series arm resonator or a parallel arm resonator.
- FIG. 4 is a circuit diagram of the boundary acoustic wave device according to the first embodiment.
- FIG. 1A is a schematic plan view of a boundary acoustic wave device according to a first embodiment of the present invention
- FIG. 1B is a schematic front sectional view
- FIG. It is a partial notch front sectional drawing shown.
- FIG. 2 is a plan view of the boundary acoustic wave device according to
- FIG. 5 is a schematic plan view of a boundary acoustic wave device of a first comparative example prepared for comparison with the first embodiment.
- FIG. 6 is a circuit diagram of the boundary acoustic wave device of the first comparative example shown in FIG.
- FIG. 7 is a diagram illustrating attenuation frequency characteristics of the boundary acoustic wave devices of the first embodiment and the first comparative example.
- FIG. 8 is a schematic plan view of the boundary acoustic wave device according to the second embodiment.
- FIG. 9 is a diagram illustrating attenuation frequency characteristics of the boundary acoustic wave devices according to the first and second embodiments.
- FIG. 10 is a circuit diagram of a conventional surface acoustic wave filter device.
- FIG. 10 is a circuit diagram of a conventional surface acoustic wave filter device.
- FIG. 11 is a schematic front sectional view of a boundary acoustic wave device according to a third embodiment of the present invention.
- FIG. 12 is a schematic front sectional view of a boundary acoustic wave device according to a fourth embodiment of the present invention.
- FIG. 1A is a schematic plan view for explaining a main part of the boundary acoustic wave filter device according to the first embodiment of the present invention
- FIG. 1B is a schematic part of the boundary acoustic wave device. It is front sectional drawing
- (c) is a partial notch front sectional drawing which expands and shows the principal part of (b).
- FIG. 2 is a plan view of the boundary acoustic wave device according to the present embodiment.
- the boundary acoustic wave device 1 has a rectangular planar shape.
- Metal bumps 2 to 7 are arranged on the upper surface of the boundary acoustic wave device 1. Using these metal bumps 2 to 7, the boundary acoustic wave device 1 can be surface-mounted on a printed circuit board or the like by a flip chip bonding method.
- the boundary acoustic wave device 1 includes a piezoelectric substrate 11.
- the piezoelectric substrate 11 is made of a LiNbO 3 substrate.
- the piezoelectric substrate 11 is made of a piezoelectric single crystal such as LiNbO 3 , LiTaO 3 or quartz.
- the piezoelectric substrate 11 may be formed of a piezoelectric material other than a piezoelectric single crystal such as piezoelectric ceramics.
- a dielectric 12 is laminated on the upper surface of the piezoelectric substrate 11.
- the dielectric 12 is made of a SiO 2 film having a thickness of 6 ⁇ m.
- the dielectric 12 is not limited to SiO 2 and can be formed of an appropriate dielectric material such as an inorganic dielectric material such as other dielectric ceramics such as SiN, or an organic dielectric material such as synthetic resin. .
- An electrode structure 13 is formed at the interface between the piezoelectric substrate 11 and the dielectric 12.
- the electrode structure 13 constitutes a ladder type filter circuit described later.
- FIG. 1B is a schematic cross-sectional view of a portion along the line ZZ in FIG. Actually, the electrode structure 13 does not appear in this cross section, but for ease of understanding, the electrode structure 13 is illustrated in FIG.
- the electrode structure 13 is formed of a metal such as Au, Pt, Al or Cu, or a metal such as an alloy mainly composed of these metals.
- the electrode film for forming the electrode structure 13 may be a laminate of a plurality of metal films.
- a sound absorbing resin layer 14 is formed so as to cover the dielectric 12.
- the sound absorbing resin layer 14 is provided in order to absorb the waves that have propagated to the upper surface side of the dielectric 12.
- a sound absorbing resin for example, an appropriate material such as polyimide can be used.
- FIG. 1A is a schematic plan view showing the electrode structure 13 with the dielectric 12 and the sound absorbing resin layer 14 and the like removed in the boundary acoustic wave device 1.
- the electrode structure 13 formed on the piezoelectric substrate 11 constitutes a ladder type filter circuit having series arm resonators S1 to S6 and parallel arm resonators P1 to P4.
- FIG. 4 is a circuit diagram showing this ladder type filter circuit.
- the series arm resonators S1 to S6 and the parallel arm resonators P1 to P4 are all formed of a 1-port boundary acoustic wave resonator.
- the electrode structure of the 1-port boundary acoustic wave resonator is schematically shown in FIG. As shown in FIG.
- the 1-port boundary acoustic wave resonator 8 includes an IDT electrode 9 and reflectors 10 a and 10 b disposed on both sides of the IDT electrode 9 in the boundary acoustic wave propagation direction.
- the IDT electrode 9 is composed of a pair of comb electrodes having a plurality of electrode fingers interleaved with each other.
- FIG. 1A the electrode structure of the 1-port boundary acoustic wave resonator is omitted for easy illustration. That is, in FIG. 1 (a), the portions where the series arm resonators S1 to S6 and the parallel arm resonators P1 to P4 are provided are schematically shown by blocks marked with X in a rectangular frame.
- series arm resonators S1 to S6 are connected in series to a series arm connecting an input terminal 21 and an output terminal 22.
- a plurality of parallel arms are connected between the series arm and the ground potential. That is, a plurality of parallel arms each having parallel arm resonators P1 to P4 are connected between the series arm and the ground potential.
- the electrode structure 13 has a signal wiring 23 that electrically connects the series arm resonators S1 to S6 to each other, and one end of each parallel arm resonator P1 to P4 connected to the ground potential.
- the electrode structure 13 also has an input terminal 21 which is an electrode pad electrically connected to the signal wiring 23 and an output terminal 22 which is an electrode pad connected to the output side.
- FIG. 1 (a) the positions where the above-described metal bumps 2 to 7 are formed are schematically shown by alternate long and short dash lines.
- the metal bumps 2 and 7 are metal bumps connected to the input terminal 21 and the output terminal 22, respectively.
- the metal bumps 3, 4, 5, and 6 are metal bumps formed on the ground pads 28 to 31, respectively, and electrically connected to the ground pads 28 to 31.
- a serial arm connecting the input terminal 21 and the output terminal 22 is interposed between the ground pads 28 and 29 and the ground pads 30 and 31.
- the piezoelectric substrate 11 is reduced in size, the arrangement of the resonators and the ground pads is limited, and thus, there are cases where a series arm must be interposed between at least two ground pads.
- the feature of this embodiment is that all the ground pads 28 to 31 are electrically connected as shown in FIG. 4 even if a series arm is interposed between at least two ground pads. This is to strengthen the ground. This will be described more specifically.
- the ground connection conductor 32 is made of an appropriate metal such as a metal such as Ag, Al, or Cu or an alloy mainly composed of these metals.
- FIG. 1C is a cross-sectional view schematically showing a portion where the ground pad 31 is formed.
- the ground pad 31 is electrically connected to the IDT electrode forming the parallel arm resonator P4 by the ground wiring 27.
- a through hole 12a is formed in the dielectric 12 so that the ground pad 31 is exposed.
- a via-hole conductor 33 is formed so as to cover the inner peripheral surface of the through hole 12a. The lower end of the via-hole conductor 33 reaches the upper surface of the ground pad 31 and is electrically connected to the ground pad 31. The upper end of the via-hole conductor 33 is connected to the ground connection conductor 32.
- the via-hole conductor 33 is formed in the same process using the same material as the ground connection conductor 32. However, the via-hole conductor 33 and the ground connection conductor 32 may be formed separately from different materials.
- the via hole conductor 33 and the ground connection conductor 32 can be formed by an appropriate method such as vapor deposition or sputtering.
- an under bump metal layer 34 is formed in a portion surrounded by the via hole conductor 33, and the metal bump 6 is formed on the under bump metal layer 34. ing.
- ground pad 31 and the ground connection conductor 32 are also exposed to the through-holes 12a provided in the dielectric 12, and the same via-hole conductors are also exposed. 33 and the ground connection conductor 32 are electrically connected to each other.
- all the ground pads 28 to 31 are electrically connected by the plurality of via hole conductors 33 and the ground connection conductors 32. Therefore, as shown in FIG. 4, the ends of the parallel arm resonators P1 to P4 corresponding to the ground pads 28 to 31 connected to the ground potential are connected to the ground potential through various paths. Therefore, the ground is strengthened. As a result, as will be described later, it is possible to increase the attenuation outside the passband.
- the signal wiring 23 is three-dimensionally crossed with the ground connection conductor 32 and the dielectric 12 at the portion indicated by the arrow A in FIG. Therefore, even if the ground pads 28 and 29 and the ground pads 30 and 31 are separated on the piezoelectric substrate 11 by the serial arm, all the ground pads are obtained without increasing the planar shape of the boundary acoustic wave device 1. Since 28 to 31 can be electrically connected, the ground can be strengthened. Further, as in the present embodiment, it is desirable that the ground connection conductor 32 is three-dimensionally intersected with a part of the signal wiring 23 instead of the IDT electrode because the filter characteristics do not change.
- the ground connection conductor 32 is electrically connected to all the ground pads 28 to 31, and the ground connection conductor 32 and the ground wirings 25 and 26 face each other with the dielectric 12 interposed therebetween. It has the opposing part B which is the part which is doing. Therefore, the electrostatic capacitances 35 and 36 shown in FIG. 4 are formed. The formation of the capacitances 35 and 36 further increases the number of paths connected to the ground potential, so that the ground can be further strengthened and the out-of-band attenuation characteristics can be improved.
- all the ground pads 28 to 31 are commonly connected by the ground connection conductor 32 provided on the dielectric 12, but the ground pad 28 and The ground pad 29 may be electrically connected by a ground connection conductor provided on the piezoelectric substrate.
- the ground pad 30 and the ground pad 31 may also be electrically connected by a ground connection conductor provided on the piezoelectric substrate. In other words, as long as all the ground pads 28 to 31 are electrically connected, it is necessary that all the ground pads 28 to 31 are electrically connected by the ground connection conductor 32 provided on the dielectric 12. Not necessarily.
- series arm resonators S1 to S6 are connected to the series arm
- parallel arm resonators P1 to P4 are connected to the four parallel arms, respectively.
- the input terminal 21 side is the first filter circuit unit C
- the output terminal 22 side is the second filter circuit unit D.
- the first filter circuit part C is a part having series arm resonators S1 to S3 and parallel arm resonators P1 and P2
- the second filter circuit part D is a series arm resonator S4 to S6 and a parallel arm. It becomes a portion having resonators P3 and P4.
- the ground connection conductor 32 electrically connects the ground side end portions of the first and second filter circuit portions C and D.
- the ladder circuit configuration to which the present invention is applied is not limited to that shown in FIG. 4, and a plurality of series arm resonators are arranged on the series arm, and at least one of each of the plurality of parallel arms is arranged.
- the present invention can be applied to an appropriate ladder type filter in which a parallel arm resonator is disposed.
- a ladder filter having a circuit configuration shown in FIG. 6 was prepared as a first comparative example.
- the ground side end of the second parallel arm resonator P2 and the third parallel arm resonator P3. Is not electrically connected to the ground end.
- the first filter circuit section described above and the ground side ends of the second filter circuit section are not electrically connected to each other.
- the other configurations are the same as those shown in FIG.
- FIG. 5 is a schematic plan view of the boundary acoustic wave device of the first comparative example having the circuit configuration of FIG. 6, and corresponds to FIG. 1 (a) showing the above embodiment.
- the ground connection conductor 32 provided on the dielectric 12 is not provided, and the ground pad 28 and the ground pad 29 are connected to the ground pad 30 and the ground by the ground connection conductor 51 a formed on the piezoelectric substrate 11.
- the pad 31 is electrically connected by the ground connection conductor 51b formed on the piezoelectric substrate 11, it is the same as that of the said embodiment.
- FIG. 7 is a diagram showing the attenuation frequency characteristics of the boundary acoustic wave devices of the first embodiment and the first comparative example.
- the solid line indicates the result of the first embodiment
- the broken line indicates the result of the first comparative example.
- the end connected to all the ground pads 28 to 31 is electrically connected by the electrical connection structure including the ground connection conductor 32, so that the ground is strengthened.
- the ground is also strengthened by the addition of the capacitances 35 and 36.
- the amount of attenuation outside the passband can be greatly increased without forming a large inductance or capacitance.
- FIG. 8 is a schematic plan view of the boundary acoustic wave device according to the second embodiment, and corresponds to FIG. 1A shown for the first embodiment.
- the ground connection conductor 32 provided on the dielectric 12 is not provided, and all the ground pads 28 to 31 are electrically connected by the electrode pattern formed on the piezoelectric substrate 11. That is, the ground pads 28 to 31 are electrically connected by the ground connection conductors 41 a to 41 c formed on the piezoelectric substrate 11.
- the signal wiring 42 connecting the series arm resonator S3 and the series arm resonator S4 is three-dimensionally crossed with the ground connection conductor 41b. That is, the signal wiring 42 is a conductor formed on the dielectric 12 like the ground connection conductor 32 described above.
- FIG. 1 the ground connection conductor 32 provided on the dielectric 12 is not provided, and all the ground pads 28 to 31 are electrically connected by the electrode pattern formed on the piezoelectric substrate 11. That is, the ground pads 28 to 31 are electrically connected by the ground connection conductors 41
- the series arm resonators S ⁇ b> 3 and S ⁇ b> 4 and the signal wiring 42 are electrically connected by through holes and via-hole conductors provided in hatched portions indicated by arrows J and K of the dielectric 12.
- all the wirings for electrical connection may be formed on the upper surface of the piezoelectric substrate 11. Therefore, in 2nd Embodiment, the opposing part shown by the arrow B shown to Fig.1 (a) is not provided. That is, in the first embodiment, the facing portion B in which a part of the ground connection conductor 32 faces the ground wiring below is formed through the dielectric 12.
- the opposed portion B is not provided, and the ground wiring 25 and the ground connection conductor 41a are opposed to each other on the piezoelectric substrate. Moreover, the ground wiring 26 and the ground connection conductor 41c are opposed to each other on the piezoelectric substrate.
- the second embodiment is the same as the first embodiment.
- FIG. 9 is a diagram showing attenuation frequency characteristics of the first embodiment and the second embodiment, where the solid line shows the result of the first embodiment and the broken line shows the result of the second embodiment.
- the attenuation characteristic on the low pass band side is worse than that in the first embodiment. This is because the ground wiring and the ground connection wiring only face each other on the piezoelectric substrate and do not have the facing portion B facing each other through the dielectric 12. That is, in the first embodiment, by providing the facing portion B, the effect of adding capacitance is increased, thereby further strengthening the ground and improving the out-of-passband attenuation characteristics. by. However, even in the second embodiment, the attenuation outside the passband is greatly improved as compared with the first comparative example described above.
- a capacitance corresponding to the capacitance by the facing portion B must be added. More specifically, between the ground lines connected to the ground side ends of the plurality of parallel arm resonators provided on the piezoelectric substrate, for example, between the ground lines 25 and 26 and the ground lines 24 and 27, respectively. It is thought that a capacitance of 0.05 pF should be added. However, in such a configuration, a capacitor having a capacitance of 0.05 pF must be formed on the piezoelectric substrate by a comb-shaped electrode pattern, resulting in an increase in the size of the boundary acoustic wave device. Further, when an external capacitor element is used, the number of parts increases. Therefore, the first embodiment is more advantageous than the second embodiment in terms of both out-of-passband characteristics and miniaturization.
- FIG. 11 is a schematic partial front sectional view of a boundary acoustic wave device according to a third embodiment of the present invention, but may have a film structure as in the third embodiment. That is, in the third embodiment, the second dielectric 61 made of SiN is formed on the dielectric 12 whose film thickness is thinner than that of the first embodiment. In other respects, the third embodiment is the same as the first embodiment.
- the vibration energy of the boundary acoustic wave can be effectively confined.
- the dielectric 12 is thinner than in the first embodiment, a part B of the ground connection conductor 32 is opposed to the lower ground wiring via the dielectric 12. As a result, the capacitance formed is increased, and the out-of-band attenuation characteristics can be improved.
- the sound absorbing resin layer 14 is provided on the second dielectric 61, but the sound absorbing resin layer 14 is not necessarily required.
- FIG. 12 is a schematic partial front sectional view of the boundary acoustic wave device according to the fourth embodiment of the present invention.
- the film structure of the boundary acoustic wave device 1 of the present invention is the same as that of the fourth embodiment.
- Such a film structure may be used. That is, in the fourth embodiment, the second dielectric 62 made of SiN is interposed between the dielectric 12 having a smaller film thickness than the first embodiment and the ground connection conductor 32.
- the fourth embodiment is the same as the first embodiment. In this case, the sound absorbing resin layer 14 is not always necessary. Also in the fourth embodiment, the out-of-band attenuation characteristic can be improved as in the first embodiment.
- the ground connection conductor 32 is provided on the film as in the first embodiment, but the signal wiring 42 is provided on the film as in the second embodiment. It may be provided.
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Abstract
Description
2~7…金属バンプ
8…1ポート型弾性境界波共振子
9…IDT電極
10a,10b…反射器
11…圧電基板
12…誘電体
12a…貫通孔
13…電極構造
14…吸音樹脂層
21…入力端子
22…出力端子
23…信号配線
24~27…グラウンド配線
28~31…グラウンドパッド
32…グラウンド接続導体
33…ビアホール導体
34…アンダー・バンプ・メタル層
35,36…静電容量
41a~41c…グラウンド接続導体
42…信号配線
51a,51b…グラウンド接続導体
61,62…第2の誘電体
P1~P4…並列腕共振子
S1~S6…直列腕共振子
Claims (10)
- 圧電基板と、
前記圧電基板上に形成された第1の誘電体と、
前記圧電基板と前記第1の誘電体との界面に設けられた電極構造とを備え、該電極構造が、入力端と出力端とを結ぶ直列腕において互いに直列に接続された複数の直列腕共振子と、前記直列腕とグラウンド電位との間に接続された複数の並列腕のそれぞれにおいて、直列腕とグラウンド電位との間に接続された並列腕共振子と、前記複数の並列腕の各グラウンド電位に接続される側の端部にそれぞれ接続された複数のグラウンド配線と、複数のグラウンド配線にそれぞれ接続された複数のグラウンドパッドとを有し、ラダー型フィルタを形成しており、
前記複数のグラウンドパッドの内少なくとも2つのグラウンドパッドの間に介在するように配置された前記直列腕を構成する信号配線と、
前記少なくとも2つのグラウンドパッドを電気的に接続するグラウンド接続導体とを備え、
前記信号配線と前記グラウンド接続導体とは、前記第1の誘電体を介して立体交差しており、
かつ、全ての前記グラウンドパッドが電気的に接続されていることを特徴とする、弾性境界波装置。 - 前記信号配線は前記圧電基板上に形成され、
前記グラウンド接続導体は前記第1の誘電体上に形成され、前記第1の誘電体を貫通するビアホール導体を介して、前記少なくとも2つのグラウンドパッドに電気的に接続されており、
前記信号配線と前記グラウンド接続導体とは、前記第1の誘電体を介して立体交差している、請求項1に記載の弾性境界波装置。 - 前記グラウンド接続導体が、全ての前記グラウンドパッドに電気的に接続されている、請求項1または2に記載の弾性境界波装置。
- 前記グラウンド接続導体と、前記グラウンド配線とが前記第1の誘電体を介して対向している部分を有し、該対向している部分において、静電容量が形成されている、請求項1~3のいずれか1項に記載の弾性境界波装置。
- 前記信号配線の一部は前記第1の誘電体上に形成され、前記第1の誘電体を貫通するビアホール導体を介して、前記信号配線の他の部分に電気的に接続され、
前記グラウンド接続導体は前記圧電基板上に形成されており、
前記信号配線の一部と前記グラウンド接続導体とは、前記第1の誘電体を介して立体交差している、請求項1に記載の弾性境界波装置。 - 前記ラダー形フィルタが、入力端側に配置された第1のフィルタ回路部と、出力端側に配置された第2のフィルタ回路部とを有し、第1,第2のフィルタ回路部が、それぞれ、直列腕に接続された少なくとも1つの直列腕共振子と、少なくとも1つの並列腕に配置された少なくとも1つの並列腕共振子とを有し、前記第1のフィルタ回路部と前記第2のフィルタ回路部のグラウンド電位に接続される側の端部同士が、前記グラウンド接続導体により電気的に接続されている、請求項1~5のいずれか1項に記載の弾性境界波装置。
- 前記グラウンドパッドを露出させるように前記第1の誘電体に貫通孔が形成されており、該貫通孔の内周面に前記ビアホール導体が形成されており、かつ該貫通孔内に充填されたアンダー・バンプ・メタル層と、該アンダー・バンプ・メタル層上に設けられた金属バンプとをさらに備える、請求項1~6のいずれか1項に記載の弾性境界波装置。
- 前記第1の誘電体上に形成された前記グラウンド接続導体または前記信号配線の一部を覆うように設けられた吸音樹脂層をさらに備える、請求項1~7のいずれか1項に記載の弾性境界波装置。
- 前記第1の誘電体上に形成された前記グラウンド接続導体または前記信号配線の一部を覆うように設けられた第2の誘電体をさらに備える、請求項1~7のいずれか1項に記載の弾性境界波装置。
- 前記第1の誘電体と、前記第1の誘電体上に形成された前記グラウンド接続導体または前記信号配線の一部との間に設けられた第2の誘電体をさらに備える、請求項1~7のいずれか1項に記載の弾性境界波装置。
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CN200980122677XA CN102067447A (zh) | 2008-06-16 | 2009-05-19 | 弹性边界波装置 |
KR1020107027575A KR101238869B1 (ko) | 2008-06-16 | 2009-05-19 | 탄성 경계파 장치 |
EP09766364A EP2290817A4 (en) | 2008-06-16 | 2009-05-19 | ELASTIC BORDER SHAFT |
JP2009538942A JP4894927B2 (ja) | 2008-06-16 | 2009-05-19 | 弾性境界波装置 |
US12/962,864 US8013692B2 (en) | 2008-06-16 | 2010-12-08 | Boundary acoustic wave device |
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JP2011199823A (ja) * | 2010-02-26 | 2011-10-06 | Kyocera Corp | 弾性表面波装置 |
JP2013243570A (ja) * | 2012-05-22 | 2013-12-05 | Panasonic Corp | 弾性波装置 |
WO2014167752A1 (ja) * | 2013-04-10 | 2014-10-16 | 株式会社村田製作所 | デュプレクサ |
US10298199B2 (en) | 2016-03-30 | 2019-05-21 | Samsung Electro-Mechanics Co., Ltd. | Acoustic wave device and method for manufacturing the same |
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WO2010029657A1 (ja) * | 2008-09-09 | 2010-03-18 | 株式会社村田製作所 | 弾性波装置 |
US8396457B2 (en) * | 2009-12-14 | 2013-03-12 | Sony Ericsson Mobile Communications Ab | Portable communication apparatus and method of controlling the same |
JP5610953B2 (ja) * | 2010-09-24 | 2014-10-22 | キヤノン株式会社 | プリント配線板及びプリント回路板 |
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WO2017110993A1 (ja) * | 2015-12-25 | 2017-06-29 | 株式会社村田製作所 | 高周波モジュール |
US10476481B2 (en) * | 2016-08-08 | 2019-11-12 | Qorvo Us, Inc. | Acoustic filtering circuitry including capacitor |
CN109379056A (zh) * | 2018-12-03 | 2019-02-22 | 全讯射频科技(无锡)有限公司 | 一种声表面波滤波器 |
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KR101238869B1 (ko) | 2013-03-04 |
EP2290817A4 (en) | 2011-08-24 |
US20110080234A1 (en) | 2011-04-07 |
EP2290817A1 (en) | 2011-03-02 |
JPWO2009153916A1 (ja) | 2011-11-24 |
US8013692B2 (en) | 2011-09-06 |
KR20110015008A (ko) | 2011-02-14 |
CN102067447A (zh) | 2011-05-18 |
JP4894927B2 (ja) | 2012-03-14 |
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