WO2010079614A1 - フィルタ素子、分波器および電子装置 - Google Patents
フィルタ素子、分波器および電子装置 Download PDFInfo
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- WO2010079614A1 WO2010079614A1 PCT/JP2009/050234 JP2009050234W WO2010079614A1 WO 2010079614 A1 WO2010079614 A1 WO 2010079614A1 JP 2009050234 W JP2009050234 W JP 2009050234W WO 2010079614 A1 WO2010079614 A1 WO 2010079614A1
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- 229910052751 metal Inorganic materials 0.000 description 1
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- 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
- H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
-
- 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
- H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
- H03H9/58—Multiple crystal filters
- H03H9/582—Multiple crystal filters implemented with thin-film techniques
- H03H9/583—Multiple crystal filters implemented with thin-film techniques comprising a plurality of piezoelectric layers acoustically coupled
- H03H9/584—Coupled Resonator Filters [CFR]
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/0023—Balance-unbalance or balance-balance networks
- H03H9/0095—Balance-unbalance or balance-balance networks using bulk acoustic wave devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
- H03H9/17—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator
-
- 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
- H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
- H03H9/542—Filters comprising resonators of piezoelectric or electrostrictive material including passive elements
-
- 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
- H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
- H03H9/58—Multiple crystal filters
- H03H9/60—Electric coupling means therefor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/70—Multiple-port networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/70—Multiple-port networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
- H03H9/703—Networks using bulk acoustic wave devices
- H03H9/706—Duplexers
Definitions
- the present invention relates to a filter element, a duplexer, and an electronic device, and more particularly, to a filter element, a duplexer, and an electronic device in which laminated filters are cascaded.
- SCF Stacked Crystal Filter
- FIG. 1 is a schematic diagram of a conventional SCF.
- piezoelectric thin film resonators 10 and 20 are stacked one above the other.
- Each of the piezoelectric thin film resonators 10 and 20 includes a pair of electrodes (first electrodes) 12 and 16 and 22 and 26 sandwiching the piezoelectric films 14 and 24 and the piezoelectric films 14 and 16 up and down, respectively.
- the piezoelectric thin film resonators 10 and 20 have, for example, electrodes 16 and 22 in common. Thereby, the piezoelectric thin film resonators 10 and 20 are mechanically connected. That is, an elastic wave propagates between the piezoelectric thin film resonators 10 and 20.
- An object of the present filter element, duplexer, and electronic device is to increase the steepness of a filter by cascading multilayer filters, and to suppress unnecessary responses caused by cascading multilayer filters.
- the filter element includes a plurality of piezoelectric thin film resonators each including a plurality of piezoelectric thin film resonators, each of which includes a piezoelectric film and a pair of first electrodes sandwiching the piezoelectric film vertically, A multilayer filter, and a capacitor connected between an input terminal of a preceding multilayer filter of the plurality of multilayer filters and an input terminal of a subsequent multilayer filter of the plurality of multilayer filters, and the front stage
- the excitation directions of the piezoelectric thin film resonators connected to the input terminals of the front and rear multilayer filters to which the input terminals of the subsequent multilayer filters are connected are reversed.
- the filter element includes a plurality of piezoelectric thin film resonators, each of which includes a piezoelectric film and a pair of first electrodes sandwiching the piezoelectric film vertically, and is cascade-connected to each other.
- the piezoelectric thin film resonator to which the input terminals of the front and rear multilayer filters are connected has the same excitation direction of the piezoelectric thin film resonator to which the input terminals of the front and rear multilayer filters are connected.
- this filter element it is possible to increase the steepness of the filter by cascading the multilayer filters, and to suppress unnecessary responses caused by cascading the multilayer filters.
- FIG. 1 is a schematic diagram of a conventional SCF.
- 2 (a) to 2 (d) are other examples of SCF.
- FIG. 3 is a perspective view of the SCF used for the simulation.
- FIG. 4 is a diagram showing the pass characteristics of the SCF.
- FIG. 5 is a schematic diagram of filter elements in which SCFs are connected in cascade.
- FIG. 6 is a diagram showing pass characteristics of filter elements in which SCFs are cascade-connected.
- FIG. 7 is a diagram showing a wide band pass characteristic of filter elements in which SCFs are cascade-connected.
- FIG. 8 is a diagram showing pass characteristics of a filter element in which two SCFs are cascade-connected.
- FIG. 9A and FIG. 9B are schematic cross-sectional views of the first embodiment.
- FIG. 9A and FIG. 9B are schematic cross-sectional views of the first embodiment.
- FIG. 10 is a diagram showing pass characteristics of Example 1 and Comparative Example 1.
- FIG. 11A is a schematic cross-sectional view of Example 1 in which two SCFs are connected by an inductor
- FIG. 11B is a diagram illustrating the mechanical vibration of FIG. 12A is a schematic cross-sectional view when two SCFs are connected by a capacitor in the same arrangement as FIG. 11A
- FIG. 12B shows the mechanical vibration of FIG. 12A.
- FIG. 13A is a schematic cross-sectional view of Example 1 in which two SCFs are connected by a capacitor
- FIG. 13B is a diagram showing the mechanical vibration of FIG. FIG.
- FIG. 14A is a schematic cross-sectional view of another example of Example 1 in which two SCFs are connected by a capacitor
- FIG. 14B is a diagram showing the mechanical vibration of FIG.
- FIG. 15 is a schematic cross-sectional view of the second embodiment.
- FIG. 16A is a perspective view of the second embodiment
- FIG. 16B is an exploded perspective view showing each electrode and a gap.
- FIG. 17 is a schematic cross-sectional view showing another example of the second embodiment.
- 18A and 18B are schematic cross-sectional views of Comparative Example 3 and Example 3, respectively.
- FIG. 19 is a diagram showing pass characteristics of Example 3 and Comparative Example 3.
- FIG. 20 is a schematic cross-sectional view illustrating another example of the third embodiment.
- FIG. 21 is a block diagram of the fourth embodiment.
- FIG. 22 is a block diagram of the fifth embodiment.
- FIGS. 2A to 2D are schematic views of other examples of SCF.
- the piezoelectric thin film resonators 10 and 20 may be mechanically connected via an insulating film 30, for example. 2A, the upper (outer) electrode 12 of the piezoelectric thin film resonator 10 is connected to the input terminal In, and the lower (outer) electrode 26 of the piezoelectric thin film resonator 20 is connected to the output terminal. Connected to Out.
- the upper (outer) electrode 12 of the piezoelectric thin film resonator 10 is connected to the input terminal In
- the upper (inner) electrode 22 of the piezoelectric thin film resonator 20 is connected to the output terminal Out.
- the lower (inner) electrode 12 of the piezoelectric thin film resonator 10 is connected to the input terminal In
- the lower (outer) electrode 22 of the piezoelectric thin film resonator 20 is connected to the output terminal Out. It is connected to the.
- the lower (inner) electrode 12 of the piezoelectric thin film resonator 10 is connected to the input terminal In
- the upper (outer) electrode 22 of the piezoelectric thin film resonator 20 is connected to the output terminal Out. It is connected.
- the input terminal In and the output terminal Out may be connected to the upper electrode or the lower electrode, the outer electrode, or the inner first electrode.
- the SCF can be balanced (balanced terminal) without using a balun or the like because the input terminal and the output terminal are mechanically coupled.
- the filter element can be miniaturized.
- a wide pass band can be realized by adjusting the degree of coupling between the two stacked piezoelectric thin film resonators.
- FIG. 3 is a cross-sectional perspective view of the SCF 100.
- Ru is used as each electrode 12, 16, 22 and 26.
- AlN aluminum nitride
- Silicon oxide (SiO) is used as the insulating film 30.
- the film thickness H12 of the upper electrode 12, the film thickness H14 of the piezoelectric film 14, and the film thickness H16 of the lower electrode 16 of the piezoelectric thin film resonator 10 were 10, 487, and 172 nm, respectively.
- the film thickness H22 of the upper electrode 22, the film thickness H24 of the piezoelectric film 24, and the film thickness H26 of the lower electrode 26 of the piezoelectric thin film resonator 20 were 172, 487, and 10 nm, respectively.
- the thickness H30 of the insulating film 30 was 433 nm, and the area was 80 ⁇ 10 ⁇ 12 m 2 .
- FIG. 4 shows a simulation result of the pass characteristics of the SCF100.
- the SCF 100 has a wide band and low loss band-pass filter characteristic. However, it has a slow cutoff characteristic.
- FIG. 5 is a diagram showing a filter in which SCFs 100 are cascade-connected in three stages.
- the input terminal In is connected to the upper electrode 12 of the piezoelectric thin film resonator 10
- the output terminal Out is connected to the upper electrode 22 of the piezoelectric thin film resonator 20.
- the input terminal In is connected to the upper electrode 22 of the piezoelectric thin film resonator 20
- the output terminal Out is connected to the upper electrode 12 of the piezoelectric thin film resonator 10.
- the input terminal In is connected to the upper electrode 12 of the piezoelectric thin film resonator 10, and the output terminal Out is connected to the upper electrode 22 of the piezoelectric thin film resonator 20.
- the output terminal Out of the first stage SCF 101 and the input terminal In of the second stage SCF 102 are connected, and the output terminal Out of the second stage SCF 102 and the input terminal In of the third stage SCF 103 are connected.
- the cascade connection is a connection method in which the output terminal at the previous stage and the input terminal at the subsequent stage are coupled.
- FIG. 6 shows the result of simulating the pass characteristics of a filter in which the SCFs 100 of FIG. 3 are cascaded as shown in FIG. Filter without cascade connection (1 stage configuration), 2 stage cascade connection (2 stage configuration), 4 stage cascade connection (4 stage configuration), 6 stage cascade connection (6 stage configuration), 8 stage cascade connection (8 stage configuration) Simulated about.
- FIG. 6 when the number of stages of cascade connection is increased, the steepness of the cut-off characteristic is increased.
- FIG. 7 is a diagram showing the broadband pass characteristics of the filter simulated in FIG. In FIG. 7, a half-wave response 112 and a double-wave response 114 are observed at half the frequency and twice the frequency of the passband 110. Further, an unnecessary response 116 is observed around 6000 MHz.
- FIG. 8 shows the simulation results of the pass characteristics when the SCFs are cascaded in two stages.
- the pass band 110 corresponds to a resonance point of one wavelength of mechanical vibration in a single SCF.
- the response 112 and the response 114 correspond to the resonance point of the half wavelength and the double wavelength of the mechanical vibration in the single SCF.
- the unnecessary response 115 is generated when the response corresponding to the second harmonic in the single SCF is shifted to the low frequency side due to the capacitance of the piezoelectric film of the SCF of the other stage.
- the unnecessary response 115 shifted to the low frequency side by the piezoelectric film of each stage is generated at substantially the same frequency, and becomes an unnecessary response 116 having a wide band. If it is an unnecessary response in a narrow band, it can be suppressed using L and C. However, it is difficult to suppress the wide band unnecessary response 116.
- the unnecessary response band is prevented from being widened.
- Example 1 is an example in which an inductor or a capacitor is provided between the front stage and the rear stage SCF.
- FIG. 9A and FIG. 9B are schematic cross-sectional views of the first embodiment.
- FIG. 9A shows an example in which an inductor is connected between the front and rear SCFs
- FIG. 9B shows an example in which a capacitor is connected between the front and rear SCFs.
- the SCF 101 and the SCF 102 are connected in cascade.
- two piezoelectric thin film resonators 10a and 20a are stacked one above the other.
- two piezoelectric thin film resonators 10b and 20b are stacked one above the other.
- Piezoelectric thin film resonators 10a and 10b include piezoelectric films 14a and 14b, upper electrodes 12a and 12b, and lower electrodes 16a and 16b, respectively.
- the piezoelectric thin film resonators 20a and 20b include piezoelectric films 24a and 24b, upper electrodes 22a and 22b, and lower electrodes 26a and 26b, respectively.
- the piezoelectric films 14a and 14b of the SCF 101 and the SCF 102 are continuously formed. That is, the piezoelectric films 14a and 14b are integrally formed at the same time. Similarly, the piezoelectric films 24a and 24b are formed continuously. The insulating films 30a and 30b are formed continuously.
- the input terminal In of the SCF 101 is connected to the electrode 16a.
- the output terminals Out1 and Out2 of the SCF 102 are connected to the electrodes 12b and 16b, respectively.
- the output terminals Out1 and Out2 are balanced terminals, and signals having opposite phases to each other are output.
- the electrode 22a of the SCF 101 and the electrode 22b of the SCF 102 are formed continuously.
- An inductor 50 is connected between the electrode 12a of the SCF 101 (that is, the input terminal of the SCF 101) and the electrode 22b of the SCF 102 (that is, the input terminal of the SCF 102). That is, the input terminal of the SCF 101 and the input terminal of the SCF 102 are inductively coupled.
- the input terminal In of the SCF 101 is connected to the electrode 16a.
- a capacitor 40 is connected between the electrode 16a of the SCF 101 and the electrode 22b of the SCF 102. That is, the input terminal of the SCF 101 and the input terminal of the SCF 102 are electrostatically coupled.
- Other configurations are the same as those in FIG.
- FIG. 10 shows a simulation result of the pass characteristic of the first embodiment.
- Each SCF 101 and 102 has the same structure as FIG.
- the inductance of the inductor 50 is 17.5 nH, and the capacitance of the capacitor 40 is 8 fF.
- Comparative Example 1 is a filter that does not connect an inductor and a capacitor.
- the unnecessary response 115 is shifted to the low frequency side, and the unnecessary response 115 is reduced.
- Example 1 in which the capacitor is connected the unnecessary response 115 is shifted to the high frequency side, and the unnecessary response 115 is reduced.
- the frequency of the unnecessary response 115 can be shifted. Furthermore, the unnecessary response 115 can be reduced.
- FIG. 11A is the same as FIG. 9A.
- FIG. 11B is a diagram showing mechanical vibration in each piezoelectric thin film resonator. Mechanical vibration is indicated by a solid line, and vibration excited via the inductor 50 is indicated by a broken line. A mechanical vibration is excited in the resonator 10a by a signal input to the input terminal of the resonator 10a. This vibration propagates to the resonator 20a mechanically connected to the resonator 10a. At this time, it propagates from the resonator 10a to the resonator 20a as vibration having a continuous waveform as shown in FIG.
- the electrical signal of the electrode 22a of the resonator 20a propagates to the electrode 22b of the resonator 20b via the output terminal of the SCF 101 and the input terminal of the SCF 102.
- mechanical vibration is excited in the resonator 20b.
- the resonator 20a and the resonator 20b have the same phase mechanical vibration.
- the mechanical vibrations of the resonator 10a and the resonator 20b are in opposite phases. Mechanical vibration propagates from the resonator 20b to the resonator 10b. At this time, it propagates from the resonator 20b to the resonator 10b as continuous waveform vibration.
- the mechanical vibration excited in the resonator 20b through the inductor 50 is as shown by a broken line in FIG. 11B in the resonator 20b.
- the broken line is half the wavelength of the solid line.
- This mechanical vibration also propagates in a continuous waveform from the resonator 20b to the resonator 10b.
- the phase of the broken line mechanical vibration is reversed from that of the solid line mechanical vibration. For this reason, two mechanical vibrations can interfere strongly. Thereby, the frequency of an unnecessary response can be shifted.
- the excitation directions of the resonators 10a and 20b to which the input terminals are connected are mutually relative to the stacking direction of the piezoelectric thin film resonator. It only needs to be in the same direction.
- the excitation direction refers to a ground electrode (for example, the electrode 16a in the resonator 10a and the electrode 26a in the resonator 20b) as a base point, and a signal electrode such as an input terminal or an output terminal (for example, the electrode 12a in the resonator 10a, This is the direction in which the electrode 22a) of the resonator 20b is positive.
- the excitation direction of the resonator 10a is upward
- the excitation direction of the resonator 20b is the same upward direction as that of the resonator 10a.
- FIG. 12A is a schematic cross-sectional view when the inductor 50 of FIG. Other configurations are the same as those in FIG.
- FIG. 12B is a diagram showing mechanical vibration in each piezoelectric thin film resonator.
- the mechanical vibration propagating to the resonators 10a, 20a, 20b and 10b is the same as that shown in FIG.
- the mechanical vibration excited in the resonator 20b through the capacitor 40 is as shown by a broken line in FIG. 12B in the resonator 20b.
- the broken line is half the wavelength of the solid line.
- the excitation direction of the resonator 10a to which the input terminal of the preceding SCF 101 is connected and the excitation direction of the resonator 20b to which the input terminal of the subsequent SCF 102 is connected May be reversed with respect to the stacking direction.
- FIG. 13A is a schematic cross-sectional view when the input terminal In of the SCF 101 is connected to the electrode 16a.
- the excitation direction of the resonator 10a to which the input terminal of the front SCF 101 is connected is downward, and the excitation direction of the resonator 20b to which the input terminal of the rear SCF 102 is connected is upward.
- the excitation directions of the resonators 10a and 10b are reversed from each other.
- FIG. 13B is a diagram showing mechanical vibration in each piezoelectric thin film resonator.
- the phase of the mechanical vibration indicated by the solid line is reversed from that of the mechanical vibration indicated by the solid line shown in FIG.
- the phase of the broken line mechanical vibration in the resonator 10b is reversed from the solid line mechanical vibration. Therefore, the two mechanical vibrations strongly interfere to shift the frequency of unnecessary response.
- FIG. 14A is a schematic cross-sectional view when the electrode 12a is connected to the input terminal In of the SCF 101, the output terminal of the SCF 101 is the electrode 26a, and the input terminal of the SCF 102 is the electrode 26b.
- the excitation direction of the resonator 10a to which the input terminal of the front SCF 101 is connected is upward, and the excitation direction of the resonator 20b to which the input terminal of the rear SCF 102 is connected is downward.
- the excitation directions of the resonators 10a and 10b are reversed from each other. Details of the configuration are the same as in FIG.
- FIG. 14B is a diagram showing mechanical vibration in each piezoelectric thin film resonator.
- Example 2 is an example showing a specific configuration of Example 1.
- FIG. 15 is a cross-sectional view of the second embodiment.
- Two SCFs 101 and 102 shown in FIG. 9B are formed on a substrate 32 such as silicon, glass or quartz.
- An air gap 34 is provided in the substrate 32 in the region (resonance region) of the SCFs 101 and 102 that vibrates mechanically. Due to the presence of the air gap 34, the mechanical vibration of the resonators 20a and 20b is not suppressed.
- FIG. 16 (a) is a perspective view of the second embodiment
- FIG. 16 (b) is an exploded perspective view in which each electrode and the gap are disassembled for easy understanding.
- the upper electrode 42 of the capacitor 40 is formed of the same material as that of the electrode 16a and is integrally formed continuously.
- the lower electrode 46 of the capacitor 40 is formed of the same material as the electrodes 22a and 22b, and is integrally formed continuously.
- An insulating film 30 is used for the dielectric 44 of the capacitor 40. Further, the capacitor 40 is formed outside the resonance region of the SCFs 101 and 102.
- Example 1 the resonators 10a and 20a (and 10b and 20b) may not be provided via the insulating film 30 as long as they are mechanically connected.
- Example 2 two piezoelectric thin film resonators 10a and 20a (and 10b and 20b) are stacked with an insulating film 30 interposed therebetween.
- the capacitor 40 is composed of a pair of electrodes 42 and 46 (second electrodes) sandwiching the upper and lower sides with the insulating film 30 as a dielectric 44.
- the process of forming the dielectric 44 of the capacitor 40 can be made common with the process of forming the insulating film 30, and the manufacturing process can be simplified.
- the electrode 16a (first electrode) connected to the input terminal of the SCF 101 in the previous stage is continuously formed on one surface of the insulating film 30 with the electrode 42 (one of the pair of second electrodes).
- the electrode 22b (first electrode) connected to the input terminal of the subsequent SCF 102 is continuously formed on the surface opposite to one surface of the insulating film 30 with the electrode 46 (the other of the pair of second electrodes).
- the capacitor 40 is formed outside the resonance region of the piezoelectric thin film resonators of the SCFs 101 and 102. Thereby, it can suppress that the capacitor 40 prevents the vibration of a resonator.
- FIG. 17 is a schematic cross-sectional view of another example of the second embodiment. As shown in FIG. 17, an acoustic multilayer film 36 may be used instead of the gap 34 provided in the substrate 32. Other configurations are the same as those in FIG.
- Example 3 is an example of a filter in which 8 stages of SCFs are connected in cascade.
- 18A is a schematic cross-sectional view of Comparative Example 3
- FIG. 18B is a schematic cross-sectional view of Example 3.
- the SCFs 101 to 108 are connected in cascade.
- the capacitor 40 a is connected between the input terminal of the SCF 101 and the input terminal of the SCF 102.
- a capacitor 40b is connected between the SCFs 103 and 104
- a capacitor 40c is connected between the SCFs 105 and 106
- a capacitor 40d is connected between the SCFs 107 and 108.
- Example 3 the film thicknesses and areas of the SCFs 101 to 108 were the same as those in FIG.
- the capacitances of the capacitors 40a to 40d in Example 2 were 0.14 pF, 67 fF, 61 fF, and 59 fF, respectively.
- FIG. 19 shows the results of simulating the pass characteristics of Example 3 and Comparative Example 3.
- the unnecessary response 116 is smaller in the third embodiment than in the third comparative example.
- a plurality of capacitors are provided, and the capacitances of the plurality of capacitors are set to be different from each other. That is, the capacitances of all capacitors are made different. Thereby, the unnecessary response 116 can be suppressed.
- Capacitances of all capacitors need not be different.
- a plurality of capacitors are provided, and the capacitance of at least one capacitor among the plurality of capacitors is set to be significantly different from the capacitance of other capacitors. Thereby, the unnecessary response 116 can be suppressed.
- FIG. 20 is another example of the third embodiment.
- an inductor 50 a is connected between the input terminal of the SCF 101 and the input terminal of the SCF 102.
- an inductor 50 b is connected between the SCFs 103 and 104
- an inductor 50 c is connected between the SCFs 105 and 106
- an inductor 50 d is connected between the SCFs 107 and 108.
- a plurality of inductors are provided, and the inductances of the plurality of inductors are set to be different from each other. Thereby, the unnecessary response 116 can be suppressed.
- not all inductors need to have different inductances.
- a plurality of inductors are provided, and an inductor in of at least one inductor among the plurality of inductors is set so as to be significantly different from the inductance of other inductors. Thereby, the unnecessary response 116 can be suppressed.
- the filter element of the first to third embodiments is an unbalanced input-balanced output filter, it may be an unbalanced input-unbalanced output filter. Also, balanced input-unbalanced output may be used.
- Examples 1 to 3 an example in which Ru is used as each of the electrodes 12, 16, 22, and 26 is shown, but other metals may be used.
- the piezoelectric films 14 and 24 have been described by taking aluminum nitride (AlN) as an example, but, for example, zinc oxide showing orientation with the (002) direction as the main axis may be used.
- AlN aluminum nitride
- silicon oxide (SiO) is connected as an example of the insulating film 30, the piezoelectric thin film resonators 10 and 20 may be mechanically connected.
- Example 4 is an example of a duplexer.
- FIG. 21 is a block diagram of the duplexer according to the fourth embodiment.
- the duplexer 60 includes a reception filter 62 and a transmission filter 64.
- the receiving terminals Rx1 and Rx2 are balanced outputs and are connected to a receiving circuit.
- the transmission terminal Tx is an unbalanced input and is connected to the transmission circuit.
- the common terminal Ant is connected to the antenna 66.
- a reception filter 62 is connected between the reception terminals Rx1 and Rx2 and the common terminal Ant.
- a transmission filter 64 is connected between the transmission terminal Tx and the common terminal Ant.
- the transmission filter 64 passes signals in the transmission band, but suppresses signals in the reception band having a frequency different from the transmission band.
- the reception filter 62 passes the signal in the reception band, but suppresses the signal in the transmission band.
- the transmission signal input to the transmission terminal Tx passes through the transmission filter 64 and is output from the common terminal Ant. However, it is not output from the receiving terminals Rx1 and Rx2.
- the reception signal input from the common terminal Ant passes through the reception filter 62 and is output from the reception terminals Rx1 and Rx2. However, no output is made from the transmission terminal Tx.
- At least one of the transmission filter 64 and the reception filter 62 can be the filter element of the first to third embodiments. Since the SCF can easily realize balanced input / output, it is preferable to use the filter elements of the first to third embodiments for the reception filter 62 that requires a balanced output as a noise countermeasure.
- Example 5 is an example of a mobile phone terminal as an electronic device.
- FIG. 22 is a block diagram mainly showing an RF (Radio frequency) unit 82 of the mobile phone terminal.
- the RF unit 82 can switch between a plurality of communication methods.
- the RF unit 82 includes antennas 66a and 66b, a switch module 70, a duplexer bank module 61, and an amplifier module 80.
- the switch module 70 connects the duplexers 60a to 60c in the duplexer bank module 61 and the antennas 66a and 66b according to the communication method.
- the duplexer bank module 61 includes a plurality of duplexers 60a to 60c.
- the duplexers 60a to 60c include transmission filters 64a to 64c and reception filters 62a to 62c, respectively.
- the configuration of each of the duplexers 60a to 60c is the same as that of the fourth embodiment, and a description thereof is omitted.
- the amplifier module 80 includes a power amplifier that amplifies the transmission signal and outputs it to the transmission terminal of the duplexer, and a low-noise amplifier that amplifies the reception signal output from the reception terminal of the duplexer.
- At least one of the duplexers 60a to 60c can be the duplexer 60 of the fourth embodiment.
- a mobile phone terminal has been described as an example of the electronic device.
- the filter elements of the first to third embodiments can be applied to other electronic devices.
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- Crystallography & Structural Chemistry (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
Description
Claims (11)
- 各々の積層フィルタが、圧電膜と前記圧電膜を上下に挟む1対の第1電極とを含み上下に積層された複数の圧電薄膜共振器を備え、互いに縦続接続された複数の積層フィルタと、
前記複数の積層フィルタのうち前段の積層フィルタの入力端子と前記複数の積層フィルタのうち後段の積層フィルタの入力端子との間に接続されたキャパシタと、
を具備し、
前記前段および前記後段の積層フィルタの入力端子が接続する前記圧電薄膜共振器の励振方向が互いに反転していることを特徴とするフィルタ素子。 - 前記複数の積層フィルタは3個以上縦続接続されており、前記キャパシタは複数設けられ、複数の前記キャパシタのうち少なくとも1つのキャパシタのキャパシタンスは他のキャパシタのキャパシタンスと異なることを特徴とする請求項1記載のフィルタ素子。
- 前記複数の積層フィルタは3個以上縦続接続されており、前記キャパシタは複数設けられ、複数の前記キャパシタのキャパシタンスは互いに異なることを特徴とする請求項1記載のフィルタ素子。
- 前記2つの圧電薄膜共振器は、絶縁膜を介し積層されており、
前記キャパシタは、前記絶縁膜を上下に挟む一対の第2電極を含む請求項1から3のいずれか一項記載のフィルタ素子。 - 前記前段の積層フィルタの入力端子に接続された第1電極は、前記絶縁膜の一面に前記一対の第2電極の一方と連続して形成され、
前記後段の積層フィルタの入力端子に接続された第1電極は、前記絶縁膜の一面とは反対の面に前記一対の第2電極の他方と連続して形成されていることを特徴とする請求項4記載のフィルタ素子。 - 前記キャパシタは、前記2つの圧電薄膜共振器の共振領域以外に形成されていることを特徴とする請求項5記載のフィルタ素子。
- 各々の積層フィルタが、圧電膜と前記圧電膜を上下に挟む1対の第1電極とを含み上下に積層された複数の圧電薄膜共振器を備え、互いに縦続接続された複数の積層フィルタと、
前記複数の積層フィルタのうち前段の積層フィルタの入力端子と前記複数の積層フィルタのうち後段の積層フィルタの入力端子との間に接続されたインダクタと、
を具備し、
前記前段および前記後段の積層フィルタの入力端子が接続する前記圧電薄膜共振器の励振方向が同じであることを特徴とするフィルタ素子。 - 前記複数の積層フィルタは3個以上縦続接続されており、前記インダクタは複数設けられ、複数の前記インダクタのうち少なくとも1つのインダクタのインダクタンスは他のインダクタのインダクタンスと異なることを特徴とする請求項7記載のフィルタ素子。
- 前記複数の積層フィルタは3個以上縦続接続されており、前記インダクタは複数設けられ、複数の前記インダクタのインダクタンスは互いに異なることを特徴とする請求項7記載のフィルタ素子。
- 請求項1から9のいずれか一項記載のフィルタ素子を含むことを特徴とする分波器。
- 請求項1から9のいずれか一項記載のフィルタ素子を含むことを特徴とする電子装置。
Priority Applications (6)
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PCT/JP2009/050234 WO2010079614A1 (ja) | 2009-01-09 | 2009-01-09 | フィルタ素子、分波器および電子装置 |
JP2010545673A JP5086447B2 (ja) | 2009-01-09 | 2009-01-09 | フィルタ素子、分波器および電子装置 |
EP09837502A EP2387152A1 (en) | 2009-01-09 | 2009-01-09 | Filter element, branching filter, and electronic apparatus |
CN200980154141.6A CN102273073B (zh) | 2009-01-09 | 2009-01-09 | 滤波元件、分波器以及电子装置 |
KR1020117015693A KR101289982B1 (ko) | 2009-01-09 | 2009-01-09 | 필터 소자, 분파기 및 전자 장치 |
US13/177,797 US8228138B2 (en) | 2009-01-09 | 2011-07-07 | Filter element, duplexer and electronic device having piezoelectric thin-film resonators stacked vertically |
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CN102447452A (zh) * | 2010-10-11 | 2012-05-09 | 立积电子股份有限公司 | 体声波共振组件与体声波滤波器及其方法 |
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JP2016028487A (ja) * | 2011-08-19 | 2016-02-25 | クゥアルコム・インコーポレイテッドQualcomm Incorporated | 複合圧電横振動共振器 |
WO2016067858A1 (ja) * | 2014-10-27 | 2016-05-06 | 株式会社弾性波デバイスラボ | 可変周波数弾性波変換器とこれを用いた電子装置 |
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DE102015115442A1 (de) * | 2015-09-14 | 2017-03-30 | Epcos Ag | Elektronisches Bauelement und elektronische Signalverarbeitungseinheit mit einem solchen Bauelement |
CN112117978A (zh) * | 2020-10-15 | 2020-12-22 | 北京飞宇微电子电路有限责任公司 | 一种信号处理装置及其预处理模块 |
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CN102447452A (zh) * | 2010-10-11 | 2012-05-09 | 立积电子股份有限公司 | 体声波共振组件与体声波滤波器及其方法 |
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WO2016067858A1 (ja) * | 2014-10-27 | 2016-05-06 | 株式会社弾性波デバイスラボ | 可変周波数弾性波変換器とこれを用いた電子装置 |
Also Published As
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KR101289982B1 (ko) | 2013-07-26 |
US20110267155A1 (en) | 2011-11-03 |
JP5086447B2 (ja) | 2012-11-28 |
CN102273073B (zh) | 2014-01-01 |
KR20110091904A (ko) | 2011-08-16 |
CN102273073A (zh) | 2011-12-07 |
EP2387152A1 (en) | 2011-11-16 |
US8228138B2 (en) | 2012-07-24 |
JPWO2010079614A1 (ja) | 2012-06-21 |
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