JP4625260B2 - 薄膜バルク共振子の製造方法 - Google Patents
薄膜バルク共振子の製造方法 Download PDFInfo
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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
- H03H9/56—Monolithic crystal filters
- H03H9/564—Monolithic crystal filters implemented with thin-film techniques
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
- H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
- H03H3/02—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 piezoelectric or electrostrictive resonators or networks
- H03H3/04—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 piezoelectric or electrostrictive resonators or networks for obtaining desired frequency or temperature coefficient
-
- 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
- H03H9/02007—Details of bulk acoustic wave devices
- H03H9/02157—Dimensional parameters, e.g. ratio between two dimension parameters, length, width or thickness
-
- 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
- H03H9/171—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator implemented with thin-film techniques, i.e. of the film bulk acoustic resonator [FBAR] type
- H03H9/172—Means for mounting on a substrate, i.e. means constituting the material interface confining the waves to a volume
- H03H9/174—Membranes
-
- 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
- H03H9/56—Monolithic crystal filters
- H03H9/566—Electric coupling means therefor
- H03H9/568—Electric coupling means therefor consisting of a ladder configuration
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
- H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
- H03H3/02—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 piezoelectric or electrostrictive resonators or networks
- H03H2003/023—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 piezoelectric or electrostrictive resonators or networks the resonators or networks being of the membrane type
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
- H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
- H03H3/02—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 piezoelectric or electrostrictive resonators or networks
- H03H3/04—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 piezoelectric or electrostrictive resonators or networks for obtaining desired frequency or temperature coefficient
- H03H2003/0414—Resonance frequency
- H03H2003/0421—Modification of the thickness of an element
- H03H2003/0442—Modification of the thickness of an element of a non-piezoelectric layer
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
- H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
- H03H3/02—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 piezoelectric or electrostrictive resonators or networks
- H03H3/04—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 piezoelectric or electrostrictive resonators or networks for obtaining desired frequency or temperature coefficient
- H03H2003/0414—Resonance frequency
- H03H2003/0471—Resonance frequency of a plurality of resonators at different frequencies
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Description
Q=ωrL/(R1+R2+R3) …(式1)
ここで、ωrは共振周波数である。(式1)より、各層の膜質の劣化による損失の増加は、薄膜バルク共振子のQ値の低下につながることは明らかである。
まず、基板1(図2(a)参照)の第2領域の表面に、第1の薄膜バルク共振子11と第2の薄膜バルク共振子12との共振周波数の差Δf(Δf=f1−f2)に対応する深さΔt(100nm)の掘り込み69を形成する(図2(b)参照)。
次いで、第1領域の下地層2と第2領域の下地層131との表面が単一平面となるように、例えばガスクラスタイオンビーム(GCIB)により平坦化処理を行う(図2(d)参照)。これによりΔfに対応する膜厚の差Δt(Δt=t2−t1)を有する下地層2,131が形成される。
次いで、下部電極層を 200nm堆積後、パターニングして第1領域の下地層2および第2領域の下地層131の上に、第1領域の下部電極層3および第2領域の下部電極層4を形成する(図2(e)参照)。
次いで、上部電極層を200nm堆積後、パターニングして第1領域の圧電層5および第2の圧電層6の上に、第1上部電極層7および第2上部電極層8を形成する(図2(g)参照)。
まず、基板13(図4(a)参照)の表面に、200nmの下地層を成膜する(図4(b)参照)。
次いで、第1領域の下地層14に、第1の薄膜バルク共振子23の共振周波数f1と第2の薄膜バルク共振子24の共振周波数f2との差Δf(Δf=f1−f2)に対応する深さΔt(Δt=t2−t1)の掘り込み70を形成する(図4(c)参照)。
図5は、一般的な携帯電話におけるフロントエンド部分のブロック回路図である。図5において参照符号130は移相器を示し、この移相器130は受信部と送信部のアンテナの共用を可能にする。アンテナANTで受信された高周波の受信信号Rxは移相器130を通り、さらにイメージ周波数信号を除去して所定の受信帯域の周波数信号だけを通すための受信フィルタ79を介して低雑音増幅器128へ入力される。低雑音増幅器128において増幅された高周波受信信号Rxは、不図示のミキサ回路、中間周波フィルタ等の携帯電話内部回路へ送られる。
2,14,131,132…下地層、
3,4,15,16…下部電極、
5,6,17,18…圧電層、
7,8…上部電極、
9,10,21,22,39〜42…空洞、
11,12,23,24…薄膜バルク共振子、
43,45,71〜73,120〜122…直列接続の薄膜バルク共振子、
44,46,74〜77,123〜126…分路接続の薄膜バルク共振子、
69,70…掘り込み、
78…送信フィルタ、
79…受信フィルタ、
100…圧電層
128…低雑音増幅器、
129…電力増幅器、
130…移相器、
t1〜t4…下地層の膜厚、
T1〜T4…ダイヤフラム構造の膜厚。
Claims (1)
- 単一基板上に異なる厚さの下地層を含むダイヤフラム構造を有する複数の薄膜バルク共振子を製造する方法であって、
第1の薄膜バルク共振子と第2の薄膜バルク共振子との共振周波数の差に対応する深さの掘り込みを前記基板上に形成する工程と、
前記掘り込みを形成した前記基板上に下地層を成膜する工程と、
前記第1の薄膜バルク共振子を形成する第1領域の前記下地層と、前記第2の薄膜バルク共振子を形成する第2領域の前記下地層との表面が単一平面となるように処理する平坦化処理工程と、
前記下地層の表面に下部電極層を堆積後、前記下部電極層をパターニングして前記第1領域の下地層と前記第2領域の下地層との上に、第1下部電極層と第2下部電極層とをそれぞれ形成する工程と、
前記第1及び第2下部電極層の表面に圧電層を成膜する工程と、
前記圧電層の表面に上部電極層を堆積後、前記上部電極層をパターニングして前記第1領域の圧電層と前記第2領域の圧電層との上に、第1上部電極層と第2上部電極層とをそれぞれ形成する工程と、
前記基板の裏面より掘り込み、前記第1領域に第1空洞を、前記第2領域に第2空洞をそれぞれ形成する工程とを含むことを特徴とする薄膜バルク共振子の製造方法。
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JP2004027590A JP4625260B2 (ja) | 2004-02-04 | 2004-02-04 | 薄膜バルク共振子の製造方法 |
US10/909,335 US20050168102A1 (en) | 2004-02-04 | 2004-08-03 | Film bulk acoustic wave resonator, film bulk acoustic wave resonator filter and method of manufacturing film bulk acoustic wave resonator |
US11/602,330 US7408287B2 (en) | 2004-02-04 | 2006-11-21 | Film bulk acoustic wave resonator, film bulk acoustic wave resonator filter and method of manufacturing film bulk acoustic wave resonator |
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JP2004027590A JP4625260B2 (ja) | 2004-02-04 | 2004-02-04 | 薄膜バルク共振子の製造方法 |
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JP2005223479A JP2005223479A (ja) | 2005-08-18 |
JP2005223479A5 JP2005223479A5 (ja) | 2007-03-15 |
JP4625260B2 true JP4625260B2 (ja) | 2011-02-02 |
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JP5027534B2 (ja) * | 2006-07-07 | 2012-09-19 | 日本碍子株式会社 | 圧電薄膜デバイス |
JP2008109402A (ja) * | 2006-10-25 | 2008-05-08 | Toshiba Corp | 薄膜圧電共振器およびその製造方法 |
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US20100194246A1 (en) * | 2009-01-30 | 2010-08-05 | Integrated Device Technology, Inc. | Thin-Film Bulk Acoustic Resonators Having Reduced Susceptibility to Process-Induced Material Thickness Variations |
US8291559B2 (en) * | 2009-02-24 | 2012-10-23 | Epcos Ag | Process for adapting resonance frequency of a BAW resonator |
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US7408287B2 (en) | 2008-08-05 |
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US20050168102A1 (en) | 2005-08-04 |
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