JP2021153239A - アイソレータ - Google Patents
アイソレータ Download PDFInfo
- Publication number
- JP2021153239A JP2021153239A JP2020052570A JP2020052570A JP2021153239A JP 2021153239 A JP2021153239 A JP 2021153239A JP 2020052570 A JP2020052570 A JP 2020052570A JP 2020052570 A JP2020052570 A JP 2020052570A JP 2021153239 A JP2021153239 A JP 2021153239A
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- electrode
- insulating layer
- isolator
- insulating
- conductor
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Abstract
Description
図面は模式的または概念的なものであり、各部分の厚みと幅との関係、部分間の大きさの比率などは、必ずしも現実のものと同一とは限らない。同じ部分を表す場合であっても、図面により互いの寸法や比率が異なって表される場合もある。
本願明細書と各図において、既に説明したものと同様の要素には同一の符号を付して詳細な説明は適宜省略する。
図1は、第1実施形態に係るアイソレータを表す平面図である。図2は、図1のII−II断面図である。
第1実施形態に係るアイソレータは、デジタルアイソレータ、ガルバニックアイソレータ、又はガルバニック絶縁素子などと呼ばれるデバイスに関する。
基板5は、例えばシリコン基板である。基板5は、例えば、不純物が添加され、導電性を有する。
第1電極11、第2電極12、導電体50、パッド62、パッド64、及びパッド66は、金属を含む。例えば、第1電極11、第2電極12、導電体50、パッド62、パッド64、及びパッド66は、銅及びアルミニウムからなる群より選択された金属を含む。信号を伝達する際の第1電極11及び第2電極12における発熱を抑制するために、これらの構成要素の電気抵抗は、低いことが好ましい。電気抵抗の低減の観点から、第1電極11、第2電極12、導電体50、パッド62、パッド64、及びパッド66は、銅を含むことが好ましい。
絶縁部30、第1絶縁部31、絶縁部33、及び絶縁部35は、シリコン及び酸素を含む。例えば、絶縁部30、第1絶縁部31、絶縁部33、及び絶縁部35は、酸化シリコンを含む。絶縁部30、第1絶縁部31、絶縁部33、及び絶縁部35は、さらに窒素を含んでも良い。絶縁部37は、シリコン及び窒素を含む。例えば、絶縁部37は、窒化シリコンを含む。絶縁部39は、ポリイミド、ポリアミドなどの絶縁性樹脂を含む。
配線63、65、及び67は、アルミニウムなどの金属を含む。
図3は、第1実施形態に係るアイソレータの特性を表す模式図である。
図3では、第2電極12の外周近傍における等電位線EPが表されている。アイソレータ100では、第1電極11と第2電極12との間で信号が伝達されるとき、第1電極11及び導電体50に対して、第2電極12に正電圧が印加される。図3に表したように、第2電極12から第1電極11に向けた電位の勾配、及び第2電極12から導電体50に向けた電位の勾配が生じる。
図5(a)は、第1実施形態に係るアイソレータの一部を表す断面図である。図5(b)は、第1実施形態に係るアイソレータの分析結果を表すグラフである。
参考例に係るアイソレータ100rでは、図4(a)に表したように、第1絶縁層21及び第2絶縁層22に代えて、絶縁層21r及び22rがそれぞれ設けられている。絶縁層21r及び22rは、窒素及びシリコンを含む。絶縁層21r及び22rは、炭素を添加せずに形成され、炭素を実質的に含まない。
炭素が添加されていない絶縁層21rについては、界面において、シリコンのダングリングボンドが存在する。シリコンは、比較的活性であるため、第2電極12の金属がシリコンと反応する。シリコンと反応した金属は、第2電極12と導電体50との間の電位差により、導電体50に向けて、絶縁層21rの界面に沿って移動する。
一方、シリコン、炭素、及び窒素を含む第1絶縁層21については、絶縁層21rにおいてダングリングボンドが存在していた箇所に炭素が存在し、シリコンが炭素と結合している。すなわち、第1絶縁層21では、シリコンのダングリングボンドの数が、絶縁層21rに比べて少ない。このため、シリコンと第2電極12の金属との反応が抑制される。この結果、第2電極12と導電体50との間に電位差が生じた場合でも、金属は、導電体50に向けて移動しない。
図6〜図9は、第1実施形態の変形例に係るアイソレータを表す断面図である。
図6に表したアイソレータ110では、第2絶縁層22は、X−Y面に沿って第1絶縁層21から離れている。第1絶縁層21は、少なくとも第2電極12の上に設けられている。第2絶縁層22は、少なくとも第3導電部53の上に設けられている。この場合でも、アイソレータ100と同様に、第2電極12に含まれる金属の拡散を抑制できる。
図10は、第2実施形態に係るアイソレータを表す平面図である。
図11は、第2実施形態に係るアイソレータの断面構造を表す模式図である。
第2実施形態に係るアイソレータ200では、図10に表したように、配線61を介して、第1電極11の一端が導電体50と電気的に接続されている。第1電極11の他端は、配線60を介して第1回路1と電気的に接続されている。
図13は、図12のXIII−XIII断面図である。図14は、図12のXIV−XIV断面図である。
図15は、第2実施形態の第1変形例に係るアイソレータの断面構造を表す模式図である。
第1変形例に係るアイソレータ210は、図12に表したように、第1構造体10−1及び第2構造体10−2を含む。
図17は、第2実施形態の第2変形例に係るアイソレータの断面構造を表す模式図である。
第2実施形態の第2変形例に係るアイソレータ220は、図16及び図17に表したように、第1電極11の両端が第1回路1と電気的に接続されている点で、アイソレータ200と異なる。導電体50は、第1回路1及び第1電極11とは電気的に分離されている。導電体50が基準電位に設定されれば、第1回路1、第1電極11、及び導電体50の間の電気的な接続関係は、適宜変更可能である。この場合、第1電極11と導電体50との間における電位差を低減するために、第1電極11と導電体50は、同じ電位に設定されることが好ましい。
第3変形例に係るアイソレータ230は、第1構造体10−1、第2構造体10−2、第3構造体10−3、第4構造体10−4を含む。第1構造体10−1は、電極11−1及び電極12−1を含む。第2構造体10−2は、電極11−2及び電極12−2を含む。第3構造体10−3は、電極11−3及び電極12−3を含む。第4構造体10−4は、電極11−4及び電極12−4を含む。それぞれの電極は、コイルである。第1回路1は、差動ドライバ回路1a、容量C1、及び容量C2を含む。第2回路2は、差動受信回路2a、容量C3、及び容量C4を含む。
図19は、第3実施形態に係るパッケージを表す斜視図である。
図20は、第3実施形態に係るパッケージの断面構造を表す模式図である。
第3実施形態に係るパッケージ300は、図19に表したように、金属部材81a〜81f、金属部材82a〜82f、パッド83a〜83f、パッド84a〜84f、封止部90、及び複数のアイソレータ230を含む。
Claims (10)
- 第1電極と、
前記第1電極の上に設けられ、前記第1電極から離れた第2電極と、
前記第1電極から前記第2電極に向かう第1方向に垂直な第1面に沿って、前記第1電極及び前記第2電極の周りに設けられた導電体と、
前記第2電極の上に設けられ、シリコン、炭素、及び窒素を含む第1絶縁層と、
を備えたアイソレータ。 - 前記導電体は、前記第1電極と電気的に接続された請求項1記載のアイソレータ。
- 前記導電体の電位は、前記第1電極の電位と同じに設定される請求項1記載のアイソレータ。
- 前記導電体の上に設けられ、シリコン、炭素、及び窒素を含む第2絶縁層をさらに備えた請求項1又は2に記載のアイソレータ。
- 前記第1電極と前記第2電極との間に設けられた第1絶縁部と、
前記第1電極と前記第1絶縁部との間に設けられ、シリコン及び窒素を含む第3絶縁層と、
をさらに備えた請求項1〜4のいずれか1つに記載のアイソレータ。 - 前記第3絶縁層は、さらに炭素を含む請求項5記載のアイソレータ。
- シリコン、炭素、及び窒素を含む第4絶縁層をさらに備え、
前記導電体は、
前記第1面に沿って前記第1電極の周りに設けられた第1導電部と、
前記第1導電部の一部の上に設けられた第2導電部と、
前記第2導電部の上に設けられ、前記第1面に沿って前記第2電極の周りに設けられた第3導電部と、
を含み、
前記第4絶縁層は、前記第2導電部の底部の周りに設けられ、前記第2導電部と接する請求項1〜6のいずれか1つに記載のアイソレータ。 - 前記第1方向に垂直な第2方向における前記第2電極と前記導電体との間の距離は、前記第1方向における前記第1電極と前記第2電極との間の距離よりも長い請求項1〜7のいずれか1つに記載のアイソレータ。
- 前記第1電極と電気的に接続された第1回路と、
前記第2電極と電気的に接続された第2回路と、
をさらに備えた請求項1〜8のいずれか1つに記載のアイソレータ。 - 前記第1電極及び前記第2電極は、螺旋状に設けられた請求項1〜9のいずれか1つに記載のアイソレータ。
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