JPH05183104A - Doughnut-type capacitor - Google Patents

Doughnut-type capacitor

Info

Publication number
JPH05183104A
JPH05183104A JP30143891A JP30143891A JPH05183104A JP H05183104 A JPH05183104 A JP H05183104A JP 30143891 A JP30143891 A JP 30143891A JP 30143891 A JP30143891 A JP 30143891A JP H05183104 A JPH05183104 A JP H05183104A
Authority
JP
Japan
Prior art keywords
dielectric layer
capacitor
lower electrode
doughnut
upper electrode
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.)
Withdrawn
Application number
JP30143891A
Other languages
Japanese (ja)
Inventor
Yasunori Tateno
泰範 舘野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP30143891A priority Critical patent/JPH05183104A/en
Publication of JPH05183104A publication Critical patent/JPH05183104A/en
Withdrawn legal-status Critical Current

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  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
  • Semiconductor Integrated Circuits (AREA)

Abstract

PURPOSE:To provide a capacitor with good high-frequency characteristics and high reliability in a doughnut-type capacitor to be used mainly for a microwave band, particularly in a capacitor having characteristics in the earthing structure of one terminal thereof. CONSTITUTION:The title doughnut-type capacitor has a structure, in which a lower electrode 3, dielectric layer 4 and upper electrode 5 are laminated on a semiconductor substrate 1; the lower electrode 3 is connected with the earthed wiring layer 2 of the semiconductor substrate 1 through a via-hole structure, and the dielectric layer 4 and upper electrode 5 are arranged in a doughnut shape while surrouding this via-hole structure. Also, the inner diameter of the doughnut-shaped dielectric layer 4 is made at least 30mum larger than the diameter of the opening of the via-hole structure so that no stress is applied to the dielectric layer 4 even if the lower electrode 3 sinks at the time of soldering the doughnut-type capacitor to a stem.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、主にマイクロ波帯用に
用いられるキャパシタ、特にその一方の端子の接地構造
に特徴を有するキャパシタに関する。近年、マイクロ波
帯デバイスとして、均一性が優れ、大量生産に適したモ
ノリシックマイクロ波IC(MMIC)が用いられるこ
とが多いが、本発明のキャパシタもMMICのバイアス
回路、整合回路等に適した構造を有している。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor mainly used for a microwave band, and more particularly to a capacitor having a grounding structure at one terminal thereof. In recent years, as a microwave band device, a monolithic microwave IC (MMIC) having excellent uniformity and suitable for mass production is often used. The capacitor of the present invention is also suitable for a bias circuit, a matching circuit, etc. of the MMIC. have.

【0002】[0002]

【従来の技術】図3(A)、(B)は、従来のキャパシ
タの第1例の構造説明図である。この図において、21
は基板、22は下部電極、23は誘電体層、24は上部
電極、25はワイヤ、26はエアブリッジである。
2. Description of the Related Art FIGS. 3A and 3B are structural explanatory views of a first example of a conventional capacitor. In this figure, 21
Is a substrate, 22 is a lower electrode, 23 is a dielectric layer, 24 is an upper electrode, 25 is a wire, and 26 is an air bridge.

【0003】このキャパシタは、基板21の上に下部電
極22、誘電体層23、上部電極24が積層された構造
を有し、下部電極22が、上部電極24と誘電体層23
の下に長く引き出されており、ワイヤ25を用いて接地
されている。また、上部電極24と他の回路素子とは、
上部電極25を延長したエアブリッジ26を用いて接続
されている。
This capacitor has a structure in which a lower electrode 22, a dielectric layer 23, and an upper electrode 24 are laminated on a substrate 21, and the lower electrode 22 includes the upper electrode 24 and a dielectric layer 23.
It is extended to the bottom below and is grounded using a wire 25. In addition, the upper electrode 24 and other circuit elements are
The upper electrode 25 is connected using an air bridge 26 which is extended.

【0004】この従来のキャパシタでは、下部電極22
がキャパシタの下から長く引き出された構造を有し、ワ
イヤ25を用いているため、周波数が高くなるにしたが
ってその分布定数としてのインダクタンスの効果が顕在
化し、高周波特性を悪化させてしまう。この問題点を解
決するために下部電極の接続にビアホール(Via−h
ole)構造を用いたものがある。
In this conventional capacitor, the lower electrode 22
Has a structure extended from the bottom of the capacitor and uses the wire 25. Therefore, as the frequency increases, the effect of the inductance as the distributed constant becomes apparent and the high frequency characteristics deteriorate. In order to solve this problem, a via hole (Via-h
ole) structure is used.

【0005】図4(A)、(B)は、従来のキャパシタ
の第2例の構造説明図である。この図において、31は
基板、32は接地配線層、33は下部電極、34は誘電
体層、35は上部電極、36はエアブリッジである。
4A and 4B are structural explanatory views of a second example of a conventional capacitor. In this figure, 31 is a substrate, 32 is a ground wiring layer, 33 is a lower electrode, 34 is a dielectric layer, 35 is an upper electrode, and 36 is an air bridge.

【0006】このキャパシタは、基板31の接地配線層
32に接続されるように下部電極33が形成され、その
上に、誘電体層34、上部電極35が形成された構造を
有し、下部電極33は上記のように接地配線層32によ
って基板31の接地配線層32に接続され、上部電極3
5と他の回路素子とは、上部電極35を延長したエアブ
リッジ36を用いて接続されている。
This capacitor has a structure in which a lower electrode 33 is formed so as to be connected to the ground wiring layer 32 of the substrate 31, and a dielectric layer 34 and an upper electrode 35 are formed on the lower electrode 33. 33 is connected to the ground wiring layer 32 of the substrate 31 by the ground wiring layer 32 as described above, and the upper electrode 3
5 and other circuit elements are connected using an air bridge 36, which is an extension of the upper electrode 35.

【0007】[0007]

【発明が解決しようとする課題】上に説明した従来のキ
ャパシタの第2例では、上記のインダクタンスの問題は
解決されるが、このチップをAuSn等によってステム
やパッケージに組み立てた場合、下部電極32が陥没
し、その応力によって誘電体層34にクラックを生じ、
信頼性を損なうという問題がある。
In the second example of the conventional capacitor described above, the above-mentioned problem of inductance is solved, but when this chip is assembled into a stem or a package by AuSn or the like, the lower electrode 32 is formed. Collapse and the stress causes a crack in the dielectric layer 34,
There is a problem of impairing reliability.

【0008】図5は、従来のキャパシタの第2例の陥没
状態説明図である。この図において、37がステム基
板、38が金属層、39がAuSn層である他は、図4
に同符号を付して説明したものと同様である。
FIG. 5 is an explanatory view of a depressed state of a second example of the conventional capacitor. In this figure, 37 is a stem substrate, 38 is a metal layer, and 39 is an AuSn layer.
Are the same as those described with the same reference numerals.

【0009】上記の従来の第2例の構造をもつキャパシ
タは、AuSn層39によってステムやパッケージの基
板37の上の金属層38にろう付けして組み立てられる
が、その時の300℃程度の温度上昇および温度降下の
際、GaAs等の基板31、ビアホール構造の構成する
接地配線層32、下部電極33、AuSn層39等の熱
膨張係数の差が原因して薄い構造の下部電極32が下方
に吸引されるために陥没し、その応力によって誘電体層
34にクラックを生じ、回路素子としての信頼性を低下
する。
The capacitor having the structure of the second conventional example described above is assembled by brazing to the metal layer 38 on the stem or the substrate 37 of the package by the AuSn layer 39, and the temperature rise of about 300 ° C. at that time. At the time of temperature drop, the lower electrode 32 having a thin structure is attracted downward due to a difference in thermal expansion coefficient between the substrate 31 made of GaAs or the like, the ground wiring layer 32 constituting the via hole structure, the lower electrode 33, the AuSn layer 39 and the like. As a result, the dielectric layer 34 is cracked by the stress and the reliability as a circuit element is deteriorated.

【0010】本発明は、高周波特性が良好で、かつ、信
頼性が高いキャパシタを提供することを目的とする。
An object of the present invention is to provide a capacitor having good high frequency characteristics and high reliability.

【0011】[0011]

【課題を解決するための手段】この発明にかかるドーナ
ツ型キャパシタにおいては、基板上に下部電極と誘電体
層と上部電極を積層した構造を有し、該下部電極がビア
ホール構造によって基板の接地配線層に接続され、該誘
電体層および上部電極が該ビアホール構造を取り囲んで
ドーナツ状に配置されている構成を採用した。
A donut-type capacitor according to the present invention has a structure in which a lower electrode, a dielectric layer and an upper electrode are laminated on a substrate, and the lower electrode has a via hole structure to form a ground wiring of the substrate. A structure is adopted in which the dielectric layer and the upper electrode are connected to a layer and are arranged in a donut shape so as to surround the via hole structure.

【0012】この場合に、ドーナツ状の誘電体層の内径
を、ビアホール構造の開口部の直径より30μm以上大
きくすることができる。
In this case, the inner diameter of the toroidal dielectric layer can be made larger than the diameter of the opening of the via hole structure by 30 μm or more.

【0013】[0013]

【作用】本発明のように、下部電極の上に形成する誘電
体層と上部電極を、基板のビアホール構造を取り囲むよ
うにドーナツ状に配置することによって、このドーナツ
型キャパシタをステム等にろう材によって固着する際に
下部電極のビアホール構造部分が陥没しても、誘電体層
はそのビアホール構造部分上を避けて環状に形成されて
いるから、従来のキャパシタで問題になっていた誘電体
層のクラックの発生を防ぐことができる。
As in the present invention, by arranging the dielectric layer formed on the lower electrode and the upper electrode in a donut shape so as to surround the via hole structure of the substrate, this donut type capacitor is brazed to the stem or the like. Even if the via-hole structure part of the lower electrode is depressed when it is adhered by, the dielectric layer is formed in an annular shape avoiding the via-hole structure part, so that the problem of the dielectric layer The generation of cracks can be prevented.

【0014】[0014]

【実施例】以下、本発明の実施例を説明する。図1は、
本発明のドーナツ型キャパシタの一実施例の構成説明図
である。この図において、1は半導体基板、2は接地配
線層、3は下部電極、4は誘電体層、5は上部電極、6
はエアブリッジである。
EXAMPLES Examples of the present invention will be described below. Figure 1
It is a structure explanatory view of one Example of the donut type capacitor of the present invention. In this figure, 1 is a semiconductor substrate, 2 is a ground wiring layer, 3 is a lower electrode, 4 is a dielectric layer, 5 is an upper electrode, 6
Is an air bridge.

【0015】この実施例においては、他の高速回路素子
を形成する基板と一体にドーナツ型キャパシタを形成す
るためにGaAs等の半導体基板1を用い、そのビアホ
ール構造を構成する接地配線層2の上に、下部電極3を
形成し、その上の周縁部に環状の誘電体層4を形成し、
更にその上に環状の主要部をもつ上部電極5を形成して
構成している。
In this embodiment, a semiconductor substrate 1 made of GaAs or the like is used to form a donut type capacitor integrally with a substrate on which other high speed circuit elements are formed, and a ground wiring layer 2 constituting the via hole structure is formed. , A lower electrode 3 is formed, and an annular dielectric layer 4 is formed on the peripheral portion on the lower electrode 3.
Further, an upper electrode 5 having a ring-shaped main portion is further formed on the structure.

【0016】そして、下部電極3は背面の接地配線層2
を通して接地され、上部電極5と他の素子との接続は、
上部電極5の延長部であるエアブリッジ6によって行わ
れている。この実施例のドーナツ型キャパシタにおいて
は、前記のように上部電極5と誘電体層4が半導体基板
1のビアホールの直上を避ける形でドーナツ状に形成さ
れている。
The lower electrode 3 is the ground wiring layer 2 on the back surface.
Is grounded through, and the connection between the upper electrode 5 and other elements is
This is performed by an air bridge 6 which is an extension of the upper electrode 5. In the donut type capacitor of this embodiment, the upper electrode 5 and the dielectric layer 4 are formed in a donut shape so as not to be located directly above the via hole of the semiconductor substrate 1 as described above.

【0017】なお、この構造において、ビアホール構造
のエッチング精度の実績が±10μm、位置合わせ精度
の実績が±10μmであるとし、これに、±10μmの
安全性を見込んで、ドーナツ構造の内径Yをビアホール
の内径Xより30μm以上大きくすることが望ましい。
In this structure, the actual etching accuracy of the via-hole structure is ± 10 μm, and the actual positioning accuracy is ± 10 μm. In consideration of the safety of ± 10 μm, the inner diameter Y of the donut structure is set to this. It is desirable that the inner diameter X of the via hole be 30 μm or more.

【0018】この実施例によると、キャパシタのどの部
分からも平等の位置に接地部が配置されているため極め
て優れた高周波特性を有している。また、ビアホール上
にはキャパシタの誘電体層が配置されないために、この
ドーナツ型キャパシタをテスム等にマウントする際に下
部電極が陥没しても誘電体にクラック等の障害が生じな
い。
According to this embodiment, the grounding portion is arranged at an equal position from any portion of the capacitor, so that it has an extremely excellent high frequency characteristic. Further, since the dielectric layer of the capacitor is not disposed on the via hole, even if the lower electrode is depressed when the donut type capacitor is mounted on the test device or the like, the dielectric will not be damaged by cracks or the like.

【0019】図2(A)、(B)は、本発明のドーナツ
型キャパシタの使用例の説明図である。この図におい
て、11a、11bはソース電極、12はドレイン電
極、13はゲート電極、14a、14bは下部電極、1
5a、15bは誘電体層、16a、16bは上部電極、
17a、17bはエアブリッジである。
2 (A) and 2 (B) are explanatory views of a usage example of the donut type capacitor of the present invention. In this figure, 11a and 11b are source electrodes, 12 is a drain electrode, 13 is a gate electrode, 14a and 14b are lower electrodes, 1
5a and 15b are dielectric layers, 16a and 16b are upper electrodes,
17a and 17b are air bridges.

【0020】この使用例においては、図2(A)に示さ
れるように、ソースインダクタンスを低減するために二
つのソース電極11a、11bを有し、ドレイン電極1
2とゲート電極13を有するFETの両側に、下部電極
14a、14b、誘電体層15a、15b、上部電極1
6a、16bを積層して形成したドーナツ型キャパシタ
を配置し、その上部電極16a、16bとソース電極1
1a、11bとの間をエアブリッジ17a、17bによ
って接続している。
In this use example, as shown in FIG. 2A, two source electrodes 11a and 11b are provided to reduce the source inductance, and the drain electrode 1
2 on both sides of the FET having the gate electrode 13 and the lower electrode 14a, 14b, the dielectric layers 15a, 15b, the upper electrode 1
A doughnut-shaped capacitor formed by laminating 6a and 16b is arranged, and the upper electrodes 16a and 16b and the source electrode 1 are arranged.
Air bridges 17a and 17b connect between 1a and 11b.

【0021】この図2(A)に図示されたFETとドー
ナツ型キャパシタを結合した構造は、例えば図2(B)
に示される一電源RF増幅回路の破線内の部分に有効に
用いることができる。
The structure in which the FET and the donut type capacitor shown in FIG. 2A are combined is, for example, as shown in FIG.
It can be effectively used for the part within the broken line of the single power supply RF amplification circuit shown in FIG.

【0022】[0022]

【発明の効果】以上説明したように、本発明によると、
高周波特性が良好でかつ信頼性が高く、大量生産に適し
たキャパシタ構造を実現することができ、モノリシック
マイクロ波IC等の技術分野において寄与するところが
大きい。
As described above, according to the present invention,
It has good high-frequency characteristics, high reliability, can realize a capacitor structure suitable for mass production, and has a great contribution to the technical field of monolithic microwave ICs.

【図面の簡単な説明】[Brief description of drawings]

【図1】(A)、(B)は本発明のドーナツ型キャパシ
タの一実施例の構成説明図である。
1A and 1B are configuration explanatory views of an embodiment of a donut type capacitor of the present invention.

【図2】(A)、(B)は本発明のドーナツ型キャパシ
タの使用例の説明図である。
2 (A) and 2 (B) are explanatory views of a usage example of the donut type capacitor of the present invention.

【図3】(A)、(B)は従来のキャパシタの第1例の
構造説明図である。
3A and 3B are structural explanatory views of a first example of a conventional capacitor.

【図4】(A)、(B)は従来のキャパシタの第2例の
構造説明図である。
4A and 4B are structural explanatory views of a second example of a conventional capacitor.

【図5】従来のキャパシタの第2例の陥没状態説明図で
ある。
FIG. 5 is a diagram illustrating a depressed state of a second example of a conventional capacitor.

【符号の説明】[Explanation of symbols]

1 半導体基板 2 接地配線層 3 下部電極 4 誘電体層 5 上部電極 6 エアブリッジ 1 Semiconductor Substrate 2 Ground Wiring Layer 3 Lower Electrode 4 Dielectric Layer 5 Upper Electrode 6 Air Bridge

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 基板上に下部電極と誘電体層と上部電極
を積層した構造を有し、該下部電極がビアホール構造に
よって基板の接地配線層に接続され、該誘電体層および
上部電極が該ビアホール構造を取り囲んでドーナツ状に
配置されていることを特徴とするドーナツ型キャパシ
タ。
1. A structure in which a lower electrode, a dielectric layer and an upper electrode are laminated on a substrate, the lower electrode is connected to a ground wiring layer of the substrate by a via hole structure, and the dielectric layer and the upper electrode are A donut type capacitor, which is arranged in a donut shape surrounding a via hole structure.
【請求項2】 ドーナツ状の誘電体層の内径が、ビアホ
ール構造の開口部の直径より30μm以上大きいことを
特徴とする請求項1記載のドーナツ型キャパシタ。
2. The donut-shaped capacitor according to claim 1, wherein the inner diameter of the doughnut-shaped dielectric layer is larger than the diameter of the opening of the via hole structure by 30 μm or more.
JP30143891A 1991-11-18 1991-11-18 Doughnut-type capacitor Withdrawn JPH05183104A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30143891A JPH05183104A (en) 1991-11-18 1991-11-18 Doughnut-type capacitor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30143891A JPH05183104A (en) 1991-11-18 1991-11-18 Doughnut-type capacitor

Publications (1)

Publication Number Publication Date
JPH05183104A true JPH05183104A (en) 1993-07-23

Family

ID=17896893

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30143891A Withdrawn JPH05183104A (en) 1991-11-18 1991-11-18 Doughnut-type capacitor

Country Status (1)

Country Link
JP (1) JPH05183104A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180061697A1 (en) * 2016-08-30 2018-03-01 Sumitomo Electric Device Innovations, Inc. Semiconductor device having mim capacitor
US10595559B2 (en) 2015-04-30 2020-03-24 Philip Morris Products S.A. Aerosol-generating article comprising a detachable freshener delivery element with high ventilation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10595559B2 (en) 2015-04-30 2020-03-24 Philip Morris Products S.A. Aerosol-generating article comprising a detachable freshener delivery element with high ventilation
US20180061697A1 (en) * 2016-08-30 2018-03-01 Sumitomo Electric Device Innovations, Inc. Semiconductor device having mim capacitor
US10319634B2 (en) 2016-08-30 2019-06-11 Sumitomo Electric Device Innovations, Inc. Semiconductor device having MIM capacitor

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Effective date: 19990204