JP2022000900A - 電気的過剰ストレス検出デバイス - Google Patents
電気的過剰ストレス検出デバイス Download PDFInfo
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- JP2022000900A JP2022000900A JP2021142387A JP2021142387A JP2022000900A JP 2022000900 A JP2022000900 A JP 2022000900A JP 2021142387 A JP2021142387 A JP 2021142387A JP 2021142387 A JP2021142387 A JP 2021142387A JP 2022000900 A JP2022000900 A JP 2022000900A
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Abstract
Description
典型的な電気的過剰ストレス保護デバイスは、潜在的に損傷を与える電気的過剰ストレス事象からコア回路を保護するように設計される。EOS保護デバイスは、コア回路が使用中に受けると予想されるEOS条件の範囲に基づいて、コア回路を保護するようにしばしば設計される。しかしながら、EOS保護デバイスは、損傷しているEOS事象がトリガ条件、例えばトリガ電圧または閾値電圧、を超えたときにトリガするように設計されているため、トリガ事象は、例えばどのくらいの程度の指標もなしに、トリガ条件を超過したことを示すだけである。さらに、EOS保護デバイスのトリガ条件に近いがそれを超えない潜在的に損傷を与えるEOS事象が発生したとき、そのようなEOS事象の繰り返し発生が、最終的にコア回路および/またはEOS保護デバイスの実際の損傷および故障につながる可能性があるとしても、警告は提供されない。したがって、EOS保護デバイスがトリガされたかどうかにかかわらず、EOS事象の損傷に関する半定量的または定量的情報、例えば損傷を与えるEOS事象に関連付けられる電圧および消散エネルギーを提供することができるモニタデバイスに対するニーズがある。そのようなモニタデバイスは、例えば予防保全として、コア回路の閾値電圧の限界を超えるより破壊的なEOSがデバイスに影響を与える前に、EOS事象を検出し、警告をユーザに伝えることができる。加えて、EOS事象によってデバイスが損傷したとき、モニタデバイスは、デバイスに損傷を引き起こした可能性のあるEOS事象の履歴を提供することができ、それにより、EOS事象の根本原因を判定するための貴重な診断情報を提供する。
間した導電性構造体の対がトリガされるように、離間した導電性構造体のVBD1は、EOS保護デバイスのVBD2およびVH2よりも低い。離間した導電性構造体VBD1がEOS保護デバイスのVBD2およびVH2よりも高いとき、離間した導電性構造体の対はトリガしないかもしれないことが理解されよう。
● 公称アーク放電電圧=800V/マイクロm
● 10Aに対してタブT=20マイクロm
● D=0.15マイクロmに対して可変面取りC=2.5マイクロm、5マイクロm、20マイクロm、40マイクロm、100マイクロm
● 5−フィンガ構造体に対してC=10マイクロm
● メタライゼーションレベル:Met3/2/1の1つのデフォルト構造を有する、Met5、Met4
● 60Vのアーク放電電圧に対してD=0.075マイクロm
● 80Vのアーク放電電圧に対してD=0.1マイクロm
● 100Vのアーク放電電圧に対してD=0.125マイクロm
● 120V(デフォルト)のアーク放電電圧に対してD=0.15マイクロm
● 140Vのアーク放電電圧に対してD=0.175マイクロm
● 160Vのアーク放電電圧に対してD=0.2マイクロm
● 224V(測定値220V)のアーク放電電圧に対してD=0.28マイクロm
● メタライゼーションの厚さ=Met1〜Met4に対して0.53マイクロm、Met5に対して0.95〜0.99マイクロm。
● 公称アーク放電電圧=800V/マイクロm
● 10A、C=T/2に対してタブT=20マイクロm
● デフォルトは5xフィンガ構造
● メタライゼーションレベル:Met3/2/1の1つのデフォルト構造を有する、Met5、Met4
● 60Vのアーク放電電圧に対してD=0.075マイクロm
● 80Vのアーク放電電圧に対してD=0.1マイクロm
● 100Vのアーク放電電圧に対してD=0.125マイクロm
● 120V(デフォルト)のアーク放電電圧に対してD=0.15マイクロm
● 140Vのアーク放電電圧に対してD=0.175マイクロm
● 160Vのアーク放電電圧に対してD=0.2マイクロm
● 計算値224V(測定値220V)のアーク放電電圧に対してD=0.28マイクロm
● D=0.15マイクロmに対して可変面取りC
● T=5マイクロm、10マイクロm、40マイクロm
● メタライゼーションの厚さ=Met1〜Met4に対して0.53マイクロm、Met5に対して0.95〜0.99マイクロm。
● Met1〜Met4の過渡電流密度=0.45A/マイクロm
● Met5の過渡電流密度=0.9A/マイクロm
● Met5 電流2Aに対してW=2マイクロm
● Met5 電流5Aに対してW=5マイクロm
● Met5 電流10Aに対してW=10マイクロm
● Met3 電流2Aに対してW=4マイクロm
● Met3 電流5Aに対してW=10マイクロm
● Met3 電流10Aに対してW=20マイクロm
● Met1 電流2Aに対してW=4マイクロm
● Met1 電流5Aに対してW=10マイクロm
● Met1 電流10Aに対してW=20マイクロm
● 面取りされた接続
● L=50マイクロm
● メタライゼーションの厚さ=Met1〜Met4に対して0.53マイクロm、Met5に対して0.95〜0.99マイクロm
上述したように、本明細書で開示される様々な実施形態によれば、離間した導電性構造体の対またはスパークギャップ構造を含むEOSモニタデバイスを使用して電気的過剰ストレス(EOS)事象をモニタリングすることができ、EOSモニタデバイスから収集された情報はコア回路への損傷を防ぐために使用できる。いくつかの実施形態では、モニタリングはリアルタイムで応答しないことがある。むしろ、例えば、診断目的のためにEOS事象の数および大きさを判定するために、EOS事象が発生した後に検査可能なモニタリングデバイスを有することは有用であり得る。例えば、いくつかの実施形態では、電気的モニタリングは、EOSモニタデバイスの目視検査によって実行することができる。例えば、EOS事象の程度に関する診断情報は、そのような事象を将来回避するか、またはそのような事象に対してより耐性のある部品を設計するためにEOS事象の原因を判定するのに有用であり得る。以下において、デバイス例は、これらの利点および他の利点を提供する。
上記で論じたように、離間した導電性構造体の対の間のアーク放電事象の発生に基づいて、電気的過剰ストレス事象をモニタリングするために、様々な離間した導電性構造体を使用することができる。本発明者らは、例えば、図19に関して上に例示したように、たとえ異なる試験方法が導電性構造体にわたって異なる有効パルス幅を有するパルスを印加するとしても、導電性構造体にわたるアーク放電事象の発生は、試験方法とは比較的無関係であることを見出した。離間した導電性構造体を有するモニタデバイスは1つの持続時間レジームで得られた試験結果に基づいて設計することができ、一方モニタデバイスおよび/またはコア回路がさらされる実際のEOS事象は異なる持続時間レジームであるかもしれないので、結果として生じるアーク放電電圧に対する印加パルス幅の相対的独立性は有利であり得る。以下において、この利点および他の利点を例示する試験結果が説明される。
図15〜19に関して上述したように、離間した導電性構造体の対のトリガ電圧は、離間した導電性構造体の対の間の距離を変化させることによって、ならびに離間した導電性構造体の対の厚さを変化させることによってチューニングすることができる。加えて、図9A、9B、10A、10Bに関して上述したように、本発明者は、離間した導電性構造体の対のトリガ電圧が、トリガ電圧のチューニングに関して別の自由度を提供できることを見出した。さらに、本発明者らは、異なる材料を用いて離間した導電性構造体を形成することが、トリガ電圧をチューニングすることに関してさらに別の自由度を提供することができることを見出した。
図6に関して上述したように、離間した導電性構造体の対をトリガすると、IV曲線の対応する部分は、「スナップバック」領域によって特徴付けられ、その後ホールド電圧VHへの電圧の崩落が続く。いくつかの用途、例えば給電されたコア回路のEOSモニタリング、では、離間した導電性構造体の対のVHは、望ましくは所定の値より高い値に制御されてもよい。例えば、モニタデバイスが、電気的に並列接続されたいくつかの回路、例えば電源回路、と一体化されているとき、離間した導電性構造体の対のVHは、電源回路の電圧より高くてもよい。これは、例えばVHが電源電圧よりも低い場合、EOS事象に応答して離間した導電性構造体の対をトリガすると、離間した導電性構造体の対にわたる電圧がVHに崩落する結果となり、EOS事象終了後に電源がラッチアップすることがある。以下に、この効果を実証する実験結果を記載する。したがって、様々な実施形態によれば、離間した導電性構造体の対を含むモニタデバイスは、コア回路用の電源の電圧よりも高いホールド電圧を有する。
本開示のさらなる態様は、電気的過剰ストレス事象の検出および記録に関する。電気的過剰ストレス事象は検出することができ、電気的過剰ストレス事象を指す情報はメモリに格納することができ、および/または外部に電子デバイスに伝えることができる。検出回路は、電気的過剰ストレス事象および、場合によっては、電気的過剰ストレス事象の強度を検出することができる。物理メモリは、過剰ストレス事象の強度および/または電気的過剰ストレス事象の発生回数を指す情報を格納することができる。検出回路およびメモリは、電気的過剰ストレス保護回路と同じ集積回路(例えば、同じダイ上および/または同じパッケージ内の)の一部であることができる。一実施形態では、検出回路およびメモリは、複合型検出およびメモリ回路によって実装することができる。
上に論じたように、本開示の態様は、ESD事象のような電気的過剰ストレス事象を検出することに関する。EOS事象に関連付けられる情報は、記録および/または報告することができる。これは、回路、ダイ、集積回路システム、などの機能安全についての情報を提供することができる。そのような情報は、EOS事象の強度、EOS事象の持続時間、および/または検出されたEOS事象の発生回数を示すことができる。いくつかの実施形態では、EOS事象に関連付けられる情報は、EOS事象が任意の波形を有することができるので、EOS事象のパルス幅で示すことができる。そのような情報は、それぞれのEOSパルスごとに記録することができ、および/または複数の記録をパルスごとに取り込むことができる。次に、EOS事象検出に関連する例示的な実施形態を説明する。
上述の実施形態において、電気的過剰ストレス事象を感知するための装置、システム、および方法が、特定の実施形態に関連して記載されている。しかしながら、実施形態の原理および利点は、電気的過剰ストレス事象に対する感知および/または保護を必要とする任意の他のシステム、装置、または方法に使用することができることが理解されよう。
104 コア回路
108a、108b 電気的過剰ストレス(EOS)モニタデバイス
112a 高電圧電源
112b 低電圧電源
114a、114b 入力電圧端子
116 出力端子
Claims (1)
- 電気的過剰ストレス(EOS)事象をモニタリングするように構成されたデバイスであって、
EOS事象に応答して電気的にアークするように構成された離間した導電性構造体の対を備え、前記離間した導電性構造体は、アーク放電が前記離間した導電性構造体の形状に検出可能な変化を引き起こすような材料で形成され、かつそのような形状を有し、前記デバイスは、前記離間した導電性構造体の前記形状の変化がEOSモニタとして働くために検出可能であるように構成される、デバイス。
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