JP6095039B2 - 内蔵型容量性積層体 - Google Patents
内蔵型容量性積層体 Download PDFInfo
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Description
従来技術では、1つの容量性の平らなコアを使用して、回路基板に減結合静電容量を提供している。しかしながら、より高い周波数に適合するために容量性コアの容量密度が増加すると、一般に容量性コアの厚さを大幅に減らすことが必要となる。これは、回路基板の厚さを増加させてより高い周波数での寄生インダクタンスを増やすため容量性コアの厚さが増加することが望ましくないためである。
図2を参照すると、誘電層204及び/又は206を薄膜又は超薄膜(例えば、4乃至24ミクロン厚)にすることで、誘電層の両側の導電層/フォイル間でのアーク放電又は短絡の原因となる可能性のある介在物及び/又は欠陥が導入される可能性が増える。従来技術では、回路基板が完成するまで、又はさらに悪いことには動作するまで内部層の欠陥が特定されない可能性があった。すなわち、多層回路基板を製造する従来の方法は、一般に基板の全ての層を一度に結合する。しかしながら、ある層の欠陥により回路基板全体が廃棄されることで、材料を浪費してしまう。
別の新規な態様が、高い容量密度を有する平行で平らな容量性素子又は複数の分離したデバイスに特有な減結合容量性素子を与えるよう構成可能なコア容量性積層体を有するプリント回路基板を提供する。このように、実施例に応じて特定の値を具えた高い静電容量又は複数の分離した内蔵型の平らなコンデンサ又はディスクリートの値のコンデンサを与えるよう容量性積層体を選択的に構成する。
さらに別の新規な態様が、多層プリント回路基板で使用され1又はそれ以上のデバイスに局在減結合静電容量を与える内蔵型容量性積層体の中にディスクリートのコンデンサを形成することを提供する。例えば、サブアッセンブリとして容量性積層体を構成し、回路基板の中に内蔵する前に欠陥を検査する。容量性積層体の導電層の部分又は領域と絶縁することによって、ディスクリートの積層コンデンサを形成する。誘電層の所定の容量密度のために適切に大きさを決めた部分又は領域によって、所望の容量値を得る。
図6、7、8、9及び/又は図10に示すように、本開示に係る容量性積層体は、回路基板又は電子プラットフォームのコア基板の中に複数のバイパス容量層を内蔵していることで、寄生インダクタンスを減らす。すなわち、表面実装されるディスクリートのコンデンサの代わりに内蔵型コンデンサを使用することで、信号が伝送される経路長を減らし、これにより寄生インダクタンスを減らす。結果として、開示されている容量性積層体の様々な実施例は、容量性素子を回路部品の近くに移動させることによって、信号の経路長を減らす。
Claims (18)
- 高い容量密度を具えた容量性積層体を製造するための方法であって、
第1の導電層及び第2の導電層間に挟まれた、0.5乃至4ミル(mil)の厚さを有する第1の誘電コア層を有する実質的に硬質で平らなコア容量性基板であって、さらなる導電層及び誘電層を結合するための構造的剛性を与える実質的に硬質なコア容量性基板を形成するステップと;
0.12乃至1ミルの厚さを有する第1の導電フォイルを、所望の誘電率を達成するよう選択されたナノ粉末が詰まっている未硬化又は半硬化誘電材料を有し、厚さが前記第1の誘電コア層の厚さよりも薄い第2の誘電層でコーティングするステップであって、前記第2の誘電層は1平方インチ当たり5乃至60ナノファラッドの容量密度を提供し、且つ0.8乃至1ミルの厚さを有する、ステップと;
前記第1の導電層に1又はそれ以上のクリアランスのパターンを形成するステップと;
前記第2の誘電層を前記第1の導電層に結合する前に、前記第1の導電層の前記1又はそれ以上のクリアランスにエポキシを充填するステップと;
前記第2の誘電層の露出面を前記第1の導電層に結合するステップと;
前記第2の誘電層の前記誘電材料を硬化させるステップと;
前記コア容量性基板の上にそれぞれの誘電層を積層して形成する際に、前記第2の誘電層および次の誘電層の完全性を順次検査するステップと;
を具えていることを特徴とする方法。 - さらに、前記第2の誘電層を前記第1の導電層に結合する前に前記エポキシを硬化させるステップを具えていることを特徴とする請求項1に記載の方法。
- さらに、前記第2の誘電層を前記第1の導電層に結合する前に前記エポキシを平らにするステップを具えていることを特徴とする請求項1に記載の方法。
- さらに、第2の導電フォイルを、所望の誘電率を達成するよう選択されたナノ粉末が詰まっている未硬化又は半硬化誘電材料を有する第3の誘電層でコーティングするステップと;
前記第3の誘電層の露出面を前記第2の導電層に結合するステップと;
前記第3の誘電層の前記誘電材料を硬化させるステップと;
を具えていることを特徴とする請求項1に記載の方法。 - 前記第1の導電フォイル及び第1の導電層が第1の容量性素子を規定し、
前記第2の導電フォイル及び第2の導電層が第2の容量性素子を規定することを特徴とする請求項4に記載の方法。 - さらに、前記第1の導電層と第2の導電フォイルとの間に第1の導電ビアを形成するステップと;
前記第2の導電層と第1の導電フォイルとの間に第2の導電ビアを形成するステップと;
を具えており、
容量密度が高い容量性素子を、前記第1の導電層及び第2の導電フォイル間並びに前記第2の導電層及び第1の導電フォイル間に形成することを特徴とする請求項4に記載の方法。 - さらに、前記第1の導電層と前記第1の導電フォイルとの間に第1の絶縁容量性素子を形成するステップと;
前記第2の導電層と前記第2の導電フォイルとの間に第2の絶縁容量性素子を形成するステップと;
前記第1の導電層と前記第2の導電層との間に第3の絶縁容量性素子を形成するステップと;
を具えていることを特徴とする請求項4に記載の方法。 - 前記第2の誘電層が誘電膜を有しており、
前記第2の誘電層で前記第1の導電フォイルをコーティングするステップが、前記第1の導電フォイルの上に前記誘電膜を積層するステップを有していることを特徴とする請求項1に記載の方法。 - さらに、前記第1の導電フォイルに、前記第1の導電フォイルの残りの部分から電気的に絶縁された第1の領域を形成するステップを具えており、
前記第1の領域及び前記第1の導電層が、前記第1の導電フォイルの残りの部分及び前記第1の導電層から分離した容量性素子を形成することを特徴とする請求項1に記載の方法。 - 前記第1の領域の大きさ及び前記第2の誘電層の容量密度が、所望の1平方インチ当たり約22ナノファラッドの容量値を達成するよう選択されることを特徴とする請求項9に記載の方法。
- 多層の内蔵型容量性積層体を製造するための方法であって、
第1の導電層及び第2の導電層間に挟まれた第1の誘電コア層を有する実質的に硬質で平らなコア容量性基板であって、さらなる導電フォイル及び誘電層のための構造的剛性を与える実質的に硬質なコア容量性基板を形成するステップと;
0.12乃至1ミルの厚さを有する第1の導電フォイルを、所望の誘電率を達成するよう選択されたナノ粉末が詰まっている未硬化又は半硬化誘電材料でコーティングして、厚さが前記第1の誘電コア層の厚さよりも薄い第2の誘電層を形成するステップであって、前記第2の誘電層は0.8乃至1ミルの厚さを有する、ステップと;
前記第1の導電層に1又はそれ以上のクリアランスのパターンを形成するステップと;
前記第2の誘電層を前記第1の導電層に結合する前に、前記第1の導電層の前記1又はそれ以上のクリアランスにエポキシを充填するステップと;
前記第1の導電層に前記第2の誘電層を結合するステップと;
前記コア容量性基板の上にそれぞれの誘電層を積層して形成する際に、前記第2の誘電層および次の誘電層の完全性を順次検査するステップと;
順次検査された誘電層のいずれかに欠陥が見付かった場合に前記容量性積層体を廃棄するステップと;
を具えていることを特徴とする方法。 - 前記第1の導電層及び前記第1の導電フォイルが電気的に結合される場合に、前記第2の誘電層が欠陥を有することを特徴とする請求項11に記載の方法。
- 前記第1の導電層及び前記第1の導電フォイル間のインピーダンスが所望の閾値よりも小さい場合に、前記第2の誘電層が欠陥を有することを特徴とする請求項11に記載の方法。
- 前記第1の導電層に前記第2の誘電層の露出面を結合するステップが、前記第2の誘電層及び前記第1の導電フォイル間にエポキシ層を使用するステップを有していることを特徴とする請求項11に記載の方法。
- 前記第1の導電フォイルの上に追加層を結合する前に、前記第2の誘電層の完全性が検査されることを特徴とする請求項11に記載の方法。
- 電子的相互接続プラットフォームを製造する方法であって、
電子的相互接続プラットフォームが、平らな容量性積層体と、第1の回路部品と、を具えており、当該製造方法において、
前記容量性積層体が請求項1に記載された方法を用いて製造され、第1及び第2の導電層並びに1又はそれ以上の交互に並ぶ誘電層及び導電フォイルが、分離した容量性素子として機能するよう構成可能であり、
前記容量性積層体の少なくとも一方の側に、1又はそれ以上の信号層が結合され、
前記第1の回路部品が、前記容量性積層体の1又はそれ以上の導電フォイルの中の第1の導電フォイルと第1の導電層との間に形成された第1の分離した容量性素子に電気的に結合されることを特徴とする方法。 - 前記第1の回路部品が、さらに、前記容量性積層体の前記第2の導電層と1又はそれ以上の導電フォイルの中の第2の導電フォイルとの間に形成された第2の分離した容量性素子であって、前記第1の分離した容量性素子とは別個の第2の分離した容量性素子に結合されることを特徴とする請求項16に記載の方法。
- 前記電子的相互接続プラットフォームがさらに、前記平らな容量性積層体、前記1又はそれ以上の信号層、及び前記第1の回路部品を収容するチップスケールパッケージを具えていることを特徴とする請求項16に記載の方法。
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