JPH05235266A - Semiconductor integrated circuit device - Google Patents
Semiconductor integrated circuit deviceInfo
- Publication number
- JPH05235266A JPH05235266A JP3653892A JP3653892A JPH05235266A JP H05235266 A JPH05235266 A JP H05235266A JP 3653892 A JP3653892 A JP 3653892A JP 3653892 A JP3653892 A JP 3653892A JP H05235266 A JPH05235266 A JP H05235266A
- Authority
- JP
- Japan
- Prior art keywords
- integrated circuit
- circuit device
- semiconductor integrated
- lower electrode
- capacitance element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Semiconductor Integrated Circuits (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は半導体集積回路装置に係
わり、特にスイッチドキャパシタフィルタ(以後、SC
F、という)、C−R型のA/D変換器、C−R型のD
/A変換器、などの容量素子を含む半導体集積回路装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semiconductor integrated circuit device, and more particularly to a switched capacitor filter (hereinafter referred to as SC
F), C-R type A / D converter, C-R type D
The present invention relates to a semiconductor integrated circuit device including a capacitive element such as an A / A converter.
【0002】[0002]
【従来の技術】半導体集積回路装置はトランジスタ素子
や容量素子の集合体である。又、それらを含む機能ブロ
ックの集合体でもある。ここで、半導体集積回路装置の
一例としてのSCFを説明する。2. Description of the Related Art A semiconductor integrated circuit device is an assembly of transistor elements and capacitive elements. It is also an aggregate of functional blocks including them. Here, the SCF as an example of the semiconductor integrated circuit device will be described.
【0003】図4の回路図に示されたSCFで使用され
る帰還容量素子C2と入力容量素子C1とが構成されて
いる、従来の半導体集積回路装置の平面図と断面図を図
3の(A)と(B)に示す。FIG. 3 shows a plan view and a sectional view of a conventional semiconductor integrated circuit device in which a feedback capacitance element C2 and an input capacitance element C1 used in the SCF shown in the circuit diagram of FIG. 4 are configured. Shown in A) and (B).
【0004】P型半導体基板9にN型ウエル領域8が形
成され、このN型ウエル領域8の上面にシリコン酸化膜
から成る絶縁膜17を介してP型のポリシリコン層2,
12が容量素子の下部電極として形成され、その上にそ
れぞれ誘電体としての絶縁膜7を介して複数の単位上部
電極1が形成されている。入力容量素子C1は取り出し
部6で上部電極配線3によって接続された4個の単位上
部電極1と下部電極2との重なり部分が容量となる。す
なわち、単位上部電極1と下部電極2との重なり部分で
構成される単位容量素子C0 が4個並列に接続された容
量素子である。同様に、帰還容量素子C2は、2個の単
位上部電極1が上部電極配線13によって接続されてい
るから、下部電極12との重なり部分で構成される単位
容量素子C0 が2個並列に接続された容量素子である。An N type well region 8 is formed on a P type semiconductor substrate 9, and a P type polysilicon layer 2 is formed on the upper surface of the N type well region 8 with an insulating film 17 made of a silicon oxide film interposed therebetween.
12 is formed as a lower electrode of the capacitive element, and a plurality of unit upper electrodes 1 are formed thereon with an insulating film 7 serving as a dielectric interposed therebetween. In the input capacitance element C1, the overlapping portion of the four unit upper electrodes 1 and the lower electrode 2 connected by the upper electrode wiring 3 in the extraction portion 6 becomes the capacitance. That is, it is a capacitive element in which four unit capacitive elements C 0 configured by the overlapping portion of the unit upper electrode 1 and the lower electrode 2 are connected in parallel. Similarly, in the feedback capacitance element C2, since the two unit upper electrodes 1 are connected by the upper electrode wiring 13, two unit capacitance elements C 0 formed in the overlapping portion with the lower electrode 12 are connected in parallel. Is a capacitive element.
【0005】N型ウエル領域8は取り出し部10で接続
されたウエル電極配線11により接地電位(0V)とな
っている。一方、入力容量素子C1の下部電極としての
ポリシリコン層2は取り出し部5で接続された下部電極
配線4によって入力信号端子に接続され(図4)、帰還
容量素子C2の下部電極としてのポリシリコン層12は
取り出し部5で接続された下部電極配線14によって出
力信号端子に接続されている(図4)。 又、図4に示
す様に、入力容量素子C1および帰還容量素子C2の上
部電極はその配線3,13によってそれぞれスイッチ、
すなわち半導体集積回路装置内に形成されたトランジス
タによる半導体スイッチを通してAMPの一方の入力端
子に接続されている。尚、図4において、白三角印
(▽)は基準電圧端子を示している。The N-type well region 8 has a ground potential (0 V) due to the well electrode wiring 11 connected at the take-out portion 10. On the other hand, the polysilicon layer 2 as the lower electrode of the input capacitance element C1 is connected to the input signal terminal by the lower electrode wiring 4 connected at the extraction portion 5 (FIG. 4), and the polysilicon layer 2 as the lower electrode of the feedback capacitance element C2 is connected. The layer 12 is connected to the output signal terminal by the lower electrode wiring 14 connected at the extraction portion 5 (FIG. 4). Further, as shown in FIG. 4, the upper electrodes of the input capacitance element C1 and the feedback capacitance element C2 are switched by the wirings 3 and 13, respectively.
That is, it is connected to one input terminal of the AMP through a semiconductor switch formed by a transistor formed in the semiconductor integrated circuit device. In addition, in FIG. 4, a white triangle mark (∇) indicates a reference voltage terminal.
【0006】[0006]
【発明が解決しようとする課題】上述した従来の半導体
集積回路装置は図3(B)に示す様に、下部電極2およ
び12とN型ウエル領域8との間の絶縁膜17を誘電体
膜としたMOS容量C5およびC6が寄生容量としてそ
れぞれ形成される。したがって従来はこの寄生容量によ
るN型ウエル領域8からのノイズのまわり込みを防ぐた
めに、N型ウエル領域8を低電圧電源(例えば、接地電
位)に接続していた。しかしながら、寄生容量C5と寄
生容量C6(例えば、下部電極の面積が500μm2 の
場合、約0.02pF)とが同一のNウエル領域上に形
成され、ウエル領域には抵抗R1が存在し、この抵抗R
1(例えば、下部電極間の距離が10μmの場合、5k
Ω)を通る系により、出力側からのノイズが入力側にま
わり込んでしまい、ノイズ特性が悪くなるという欠点が
あった。In the conventional semiconductor integrated circuit device described above, as shown in FIG. 3B, the insulating film 17 between the lower electrodes 2 and 12 and the N-type well region 8 is formed into a dielectric film. The MOS capacitors C5 and C6 are formed as parasitic capacitors. Therefore, conventionally, the N-type well region 8 is connected to a low-voltage power supply (for example, ground potential) in order to prevent the noise from flowing from the N-type well region 8 due to the parasitic capacitance. However, the parasitic capacitance C5 and the parasitic capacitance C6 (for example, about 0.02 pF when the area of the lower electrode is 500 μm 2 ) are formed on the same N well region, and the resistor R1 exists in the well region. Resistance R
1 (for example, if the distance between the lower electrodes is 10 μm, 5 k
Due to the system passing through (Ω), noise from the output side sneak into the input side, and the noise characteristics deteriorate.
【0007】[0007]
【課題を解決するための手段】本発明の特徴は、複数の
容量素子を含む機能ブロックを有する半導体集積回路装
置において、前記機能ブロック内に共通の接続点をもつ
第1および第2の容量素子が一導電型の半導体基板にた
がいに分離された逆導電型の第1および第2のウエル領
域上にそれぞれ形成されている半導体集積回路装置にあ
る。この第1および第2の容量素子はそれぞれ単位容量
素子を並列接続して構成することができる。A feature of the present invention is that in a semiconductor integrated circuit device having a functional block including a plurality of capacitive elements, first and second capacitive elements having a common connection point in the functional block. In a semiconductor integrated circuit device formed on a first conductivity type semiconductor substrate and on opposite first conductivity type well regions separated from each other on a first conductivity type semiconductor substrate. Each of the first and second capacitance elements can be configured by connecting unit capacitance elements in parallel.
【0008】[0008]
【実施例】次に本発明について図面を参照して説明す
る。半導体集積回路装置の一例である図4の回路図に関
する本発明の一実施例としての図1(A),(B)は、
SCFの入力容量素子C1と帰還容量素子C2とが構成
されている半導体集積回路装置の平面図と断面図であ
る。尚、図1(A),(B)において図3(A),
(B)と同一もしくは類似の箇所は同じ符号で示してい
る。The present invention will be described below with reference to the drawings. 1A and 1B as one embodiment of the present invention relating to the circuit diagram of FIG. 4 which is an example of a semiconductor integrated circuit device,
FIG. 3 is a plan view and a sectional view of a semiconductor integrated circuit device in which an input capacitance element C1 and a feedback capacitance element C2 of an SCF are configured. In addition, in FIG. 1 (A), (B), FIG.
Portions that are the same as or similar to those in (B) are denoted by the same reference numerals.
【0009】P型半導体基板9に第1および第2のNウ
エル領域18,28がそれぞれ形成され、これらのN型
ウエル領域18,28の上面にシリコン酸化膜から成る
絶縁膜17を介してP型のポリシリコン層2,12が容
量素子の下部電極として形成され、その上にそれぞれ誘
電体としての絶縁膜7を介してポリシリコンからなる複
数の単位上部電極1が形成されている。入力容量素子C
1は取り出し部6で上部電極配線3によって接続された
4個の単位上部電極1と下部電極2との重なり部分が容
量となる。すなわち、単位上部電極1と下部電極2との
重なり部分で構成される単位容量素子C0 が4個並列に
接続された容量素子である。同様に、帰還容量素子C2
は、2個の単位上部電極1が上部電極配線13によって
接続されているから、下部電極12との重なり部分で構
成される単位容量素子C0 が2個並列に接続された容量
素子である。First and second N well regions 18 and 28 are formed on the P type semiconductor substrate 9, and P is formed on the upper surfaces of these N well regions 18 and 28 with an insulating film 17 made of a silicon oxide film interposed therebetween. Type polysilicon layers 2 and 12 are formed as lower electrodes of the capacitive element, and a plurality of unit upper electrodes 1 made of polysilicon are formed on the lower polysilicon electrodes 2 and 12 with an insulating film 7 serving as a dielectric interposed therebetween. Input capacitance element C
Reference numeral 1 denotes a take-out portion 6, and the overlapping portion of the four unit upper electrodes 1 and the lower electrode 2 connected by the upper electrode wiring 3 serves as a capacitance. That is, it is a capacitive element in which four unit capacitive elements C 0 configured by the overlapping portion of the unit upper electrode 1 and the lower electrode 2 are connected in parallel. Similarly, the feedback capacitance element C2
Is a capacitor element in which two unit upper electrodes 1 are connected by the upper electrode wiring 13 and thus two unit capacitor elements C 0 formed in an overlapping portion with the lower electrode 12 are connected in parallel.
【0010】それぞれのN型ウエル領域18,28は、
取り出し部10で接続されたウエル電極配線11により
接地電位(0V)となっている。一方、入力容量素子C
1の下部電極としてのポリシリコン層2は取り出し部5
で接続された下部電極配線4によって入力信号端子に接
続され(図4)、帰還容量素子C2の下部電極としての
ポリシリコン層12は取り出し部5で接続された下部電
極配線14によって出力信号端子に接続されている(図
4)。 又、図4に示す様に、入力容量素子C1および
帰還容量素子C2の上部電極はその配線3,13によっ
てそれぞれスイッチ、すなわち半導体集積回路装置内に
形成されたトランジスタによる半導体スイッチを通して
AMPの一方の入力端子に接続されている。図3と同様
に、入力容量素子C1の下部電極2とN型ウエル領域1
8との間には寄生容量C5(例えば、下部電極の面積が
500μm2 の場合、約0.02pF)が形成され、帰
還容量素子C2の下部電極12とN型ウエル領域28と
の間には寄生容量C6(例えば、下部電極の面積が50
0μm2 の場合、約0.02pF)が形成される。The respective N-type well regions 18 and 28 are
The well electrode wiring 11 connected at the extraction portion 10 provides the ground potential (0 V). On the other hand, the input capacitance element C
The polysilicon layer 2 serving as the lower electrode of
Is connected to the input signal terminal by the lower electrode wiring 4 connected by (FIG. 4), and the polysilicon layer 12 as the lower electrode of the feedback capacitance element C2 is connected to the output signal terminal by the lower electrode wiring 14 connected at the extraction portion 5. Connected (Fig. 4). Also, as shown in FIG. 4, the upper electrodes of the input capacitance element C1 and the feedback capacitance element C2 are switched by wirings 3 and 13, respectively, that is, one of the AMPs through a semiconductor switch made of a transistor formed in the semiconductor integrated circuit device. It is connected to the input terminal. Similar to FIG. 3, the lower electrode 2 and the N-type well region 1 of the input capacitor C1 are
8, a parasitic capacitance C5 (for example, about 0.02 pF when the area of the lower electrode is 500 μm 2 ) is formed, and between the lower electrode 12 of the feedback capacitance element C2 and the N-type well region 28. The parasitic capacitance C6 (for example, the area of the lower electrode is 50
At 0 μm 2 , about 0.02 pF) is formed.
【0011】しかしながら本発明では、入力容量素子C
1の下部電極2をP型半導体基板(サブ基板)9からシ
ールドするためのN型ウエル領域18と帰還容量素子C
2の下部電極12をP型半導体基板(サブ基板)9から
シールドするためのN型ウエル領域28とは分離されて
いる。このようにシールド用のN型ウエル領域をたがい
に分離すことにより、寄生容量C5と寄生容量C6は同
一のウエル領域上に存在しなくなり、これにより直接の
寄生抵抗で接続されることがなく、出力側のノイズが入
力側へまわり込まなくなり、ノイズ特性が良くなる。However, in the present invention, the input capacitance element C
N type well region 18 for shielding the lower electrode 2 of 1 from the P type semiconductor substrate (sub substrate) 9 and the feedback capacitance element C
The second lower electrode 12 is isolated from the N-type well region 28 for shielding the P-type semiconductor substrate (sub-substrate) 9 from the second lower electrode 12. By thus separating the N-type well region for shielding from each other, the parasitic capacitance C5 and the parasitic capacitance C6 do not exist on the same well region, so that they are not directly connected by the parasitic resistance. Noise on the output side will not sneak into the input side, improving the noise characteristics.
【0012】以上は例としてSCFについて説明した
が、これに限られることはなく、C−R型のA/D変換
器、C−R型のD/A変換器などでも、同様の効果が得
られる。Although the SCF has been described above as an example, the present invention is not limited to this, and a similar effect can be obtained with a CR type A / D converter or a CR type D / A converter. Be done.
【0013】図2(A),(B)は、SCFの入力容量
素子C1と帰還容量素子C2とが構成されている半導体
集積回路装置の本発明の他の実施例を示す平面図と断面
図である。尚、図2(A),(B)において図1
(A),(B)と同一もしくは類似の箇所は同じ符号で
示している。入力容量素子C1下のNウエル領域18と
帰還容量素子C2下のNウエル領域28との間のP型半
導体基板(サブ基板)9の部分に基板(サブ基板)電極
取り出し部15を設け、ここに接続する基板電極配線1
6を接地端子に接続する。この場合、図2(B)に示す
様に、寄生容量C7,C8が生じてもウエル領域間の基
板部分を電極取り出し部15により低インピーダンスの
電源に接続しているため、寄生容量C7,C8を通じて
出力のノイズが入力へまわり込まなくなり、図1の実施
例よりさらにノイズ特性が改善できる。2A and 2B are a plan view and a sectional view showing another embodiment of the present invention of a semiconductor integrated circuit device in which an input capacitance element C1 of an SCF and a feedback capacitance element C2 are formed. Is. In addition, in FIG. 2 (A), (B)
Portions that are the same as or similar to those in (A) and (B) are denoted by the same reference numerals. A substrate (sub-substrate) electrode lead-out portion 15 is provided in a portion of the P-type semiconductor substrate (sub-substrate) 9 between the N-well region 18 under the input capacitance element C1 and the N-well region 28 under the feedback capacitance element C2. Substrate electrode wiring 1 to be connected to
Connect 6 to the ground terminal. In this case, as shown in FIG. 2B, even if parasitic capacitances C7 and C8 occur, the substrate portion between the well regions is connected to the low impedance power source by the electrode lead-out portion 15, so that the parasitic capacitances C7 and C8 are connected. Therefore, the noise of the output does not sneak into the input, and the noise characteristic can be further improved as compared with the embodiment of FIG.
【0014】[0014]
【発明の効果】以上説明したように本発明は、入力容量
素子C1の下部電極2をP型半導体基板9からシールド
するためのN型ウエル領域18と帰還容量素子C2の下
部電極12をP型半導体基板9からシールドするための
N型ウエル領域28とを分離することにより、図4の回
路図に示す寄生容量C5,C6および寄生抵抗R1を通
る系をなくすことが出来る。従って、出力ノイズが入力
にまわり込まなくなり、ノイズ特性が改善される。As described above, according to the present invention, the N-type well region 18 for shielding the lower electrode 2 of the input capacitance element C1 from the P-type semiconductor substrate 9 and the lower electrode 12 of the feedback capacitance element C2 are P-type. By separating the N-type well region 28 for shielding from the semiconductor substrate 9, the system passing through the parasitic capacitances C5 and C6 and the parasitic resistance R1 shown in the circuit diagram of FIG. 4 can be eliminated. Therefore, the output noise does not sneak into the input, and the noise characteristic is improved.
【図1】本発明の一実施例を示す図であり、(A)は平
面図、(B)は(A)のA−A部の断面図である。1A and 1B are views showing an embodiment of the present invention, FIG. 1A is a plan view, and FIG. 1B is a sectional view taken along the line AA of FIG.
【図2】本発明の他の実施例を示す図であり、(A)は
平面図、(B)は(A)のA−A部の断面図である。2A and 2B are views showing another embodiment of the present invention, in which FIG. 2A is a plan view and FIG. 2B is a sectional view taken along the line AA in FIG. 2A.
【図3】従来技術を示す図であり、(A)は平面図、
(B)は(A)のA−A部の断面図である。FIG. 3 is a diagram showing a conventional technique, (A) is a plan view,
(B) is a cross-sectional view of an AA portion of (A).
【図4】SCFの回路図である。FIG. 4 is a circuit diagram of an SCF.
1 上部電極 2,12 下部電極 3,13 上部電極の配線 4,14 下部電極の配線 5 下部電極取り出し部 6 上部電極取り出し部 7 容量素子の誘電体膜としての絶縁膜 8,18,28 N型ウエル領域 9 P型半導体基板(サブ基板) 10 ウエル電極取り出し部 11 ウエル電極配線 15 基板電極取り出し部 16 基板電極配線 17 絶縁膜 1 Upper Electrode 2,12 Lower Electrode 3,13 Upper Electrode Wiring 4,14 Lower Electrode Wiring 5 Lower Electrode Extraction Part 6 Upper Electrode Extraction Part 7 Insulating Film as Dielectric Film of Capacitor 8,18,28 N Type Well region 9 P-type semiconductor substrate (sub-substrate) 10 Well electrode lead-out portion 11 Well electrode wiring 15 Substrate electrode lead-out portion 16 Substrate electrode wiring 17 Insulating film
Claims (2)
する半導体集積回路装置において、前記機能ブロック内
に共通の接続点をもつ第1および第2の容量素子が一導
電型の半導体基板にたがいに分離された逆導電型の第1
および第2のウエル領域上にそれぞれ形成されているこ
とを特徴とする半導体集積回路装置。1. In a semiconductor integrated circuit device having a functional block including a plurality of capacitive elements, the first and second capacitive elements having a common connection point in the functional block are formed on a semiconductor substrate of one conductivity type. Separated reverse conductivity type first
And a semiconductor integrated circuit device formed on the second well region, respectively.
れ単位容量素子を並列接続して構成されていることを特
徴とする請求項1に記載の半導体集積回路装置。2. The semiconductor integrated circuit device according to claim 1, wherein the first and second capacitance elements are each configured by connecting unit capacitance elements in parallel.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3653892A JP2752832B2 (en) | 1992-02-24 | 1992-02-24 | Semiconductor integrated circuit device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3653892A JP2752832B2 (en) | 1992-02-24 | 1992-02-24 | Semiconductor integrated circuit device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05235266A true JPH05235266A (en) | 1993-09-10 |
JP2752832B2 JP2752832B2 (en) | 1998-05-18 |
Family
ID=12472564
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3653892A Expired - Lifetime JP2752832B2 (en) | 1992-02-24 | 1992-02-24 | Semiconductor integrated circuit device |
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Country | Link |
---|---|
JP (1) | JP2752832B2 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07106524A (en) * | 1993-10-07 | 1995-04-21 | Nec Corp | Semiconductor integrated circuit device |
WO1996006460A1 (en) * | 1994-08-19 | 1996-02-29 | Hitachi, Ltd. | Semiconductor device |
WO1998012750A1 (en) * | 1996-09-20 | 1998-03-26 | Hitachi, Ltd. | Semiconductor integrated circuit device |
US5773872A (en) * | 1995-10-25 | 1998-06-30 | Nec Corporation | Semiconductor device having an integrated differential circuit with an improved common-mode rejection ratio (CMRR) |
US5892266A (en) * | 1996-05-30 | 1999-04-06 | Sumitomo Metal Industries, Ltd. | Layout structure of capacitive element(s) and interconnections in a semiconductor |
WO2004021439A1 (en) * | 2002-08-30 | 2004-03-11 | Matsushita Electric Industrial Co., Ltd. | Mim capacitor |
US6777775B2 (en) | 2001-07-04 | 2004-08-17 | Matsushita Electric Industrial Co., Ltd. | Semiconductor integrated circuit, D-A converter device, and A-D converter device |
WO2017159283A1 (en) * | 2016-03-18 | 2017-09-21 | 株式会社村田製作所 | Capacitive element |
-
1992
- 1992-02-24 JP JP3653892A patent/JP2752832B2/en not_active Expired - Lifetime
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07106524A (en) * | 1993-10-07 | 1995-04-21 | Nec Corp | Semiconductor integrated circuit device |
WO1996006460A1 (en) * | 1994-08-19 | 1996-02-29 | Hitachi, Ltd. | Semiconductor device |
US5773872A (en) * | 1995-10-25 | 1998-06-30 | Nec Corporation | Semiconductor device having an integrated differential circuit with an improved common-mode rejection ratio (CMRR) |
US5892266A (en) * | 1996-05-30 | 1999-04-06 | Sumitomo Metal Industries, Ltd. | Layout structure of capacitive element(s) and interconnections in a semiconductor |
WO1998012750A1 (en) * | 1996-09-20 | 1998-03-26 | Hitachi, Ltd. | Semiconductor integrated circuit device |
US6777775B2 (en) | 2001-07-04 | 2004-08-17 | Matsushita Electric Industrial Co., Ltd. | Semiconductor integrated circuit, D-A converter device, and A-D converter device |
US7777293B2 (en) | 2001-07-04 | 2010-08-17 | Panasonic Corporation | Semiconductor integrated circuit, D-A converter device, and A-D converter device |
WO2004021439A1 (en) * | 2002-08-30 | 2004-03-11 | Matsushita Electric Industrial Co., Ltd. | Mim capacitor |
US7030443B2 (en) | 2002-08-30 | 2006-04-18 | Matsushita Electric Industrial Co., Ltd. | MIM capacitor |
WO2017159283A1 (en) * | 2016-03-18 | 2017-09-21 | 株式会社村田製作所 | Capacitive element |
JPWO2017159283A1 (en) * | 2016-03-18 | 2018-10-11 | 株式会社村田製作所 | Capacitance element |
US10916378B2 (en) | 2016-03-18 | 2021-02-09 | Murata Manufacturing Co., Ltd. | Capacitance element having capacitance forming units arranged and electrically connected in series |
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