JP7273741B2 - 光結合装置及び高周波装置 - Google Patents
光結合装置及び高周波装置 Download PDFInfo
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- JP7273741B2 JP7273741B2 JP2020019407A JP2020019407A JP7273741B2 JP 7273741 B2 JP7273741 B2 JP 7273741B2 JP 2020019407 A JP2020019407 A JP 2020019407A JP 2020019407 A JP2020019407 A JP 2020019407A JP 7273741 B2 JP7273741 B2 JP 7273741B2
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Description
先ず、第1の実施形態について説明する。
図1は、本実施形態に係る光結合装置を示す斜視図である。
図2(a)~(c)は、本実施形態に係る光結合装置を示す三面図である。
図3は、本実施形態に係る光結合装置を示す回路図である。
図4(a)は本実施形態に係る高周波装置を示す平面図であり、(b)はその断面図である。
本実施形態に係る光結合装置は、例えば、フォトリレーである。
電極板21~24は、それぞれ、接合部材120を介して基板110に接続される。電極板21と電極板22との間には、高周波電流RFが印加されている。高周波電流RFは、例えば、半導体装置を試験する際の試験用の高周波信号として用いられる。この高周波電流RFの周波数は、例えば、10GHz以上であり、例えば、20~24GHz程度である。MOSFET13及び14がオフ状態であると、高周波電流RFは光結合装置1を実質的に通過しない。
光結合装置1においては、電極板21が薄い1枚の板であり、下面21Lに半田等の接合部材が接合され、上面21UにMOSFET13のドレイン端子13dが接合される。このため、電極板21のインダクタンス成分が小さく、電極板21における高周波電流RFの損失が小さい。同様に、電極板22も薄い1枚の板であるため、電極板22における高周波電流RFの損失が小さい。この結果、光結合装置1は高周波電流の通過特性が良好である。
図5(a)~(c)は、本実施形態に係る光結合装置を示す三面図である。
図5(a)~(c)に示すように、本実施形態に係る光結合装置2は、第1の実施形態に係る光結合装置1(図1~図4参照)と比較して、金属板41の替わりに絶縁膜45が設けられている点が異なっている。絶縁膜45の上面45Uは受光素子11の下面11Lに接合され、絶縁膜45の下面45Lは封止部材50の下面50Lにおいて露出している。Z方向から見て、絶縁膜45は受光素子11よりもひと回り大きい。絶縁膜45は、外部の実装基板(図示せず)に受光素子11を固定する絶縁性の固定材料として機能してもよい。絶縁膜45は、例えば、DAF(Die Attach Film)又はDBF(Die Bonding Film)であり、例えば、エポキシ樹脂、アクリルポリマー及びポリイミド等の混合物に、シリカ等の無機粒子を加えた材料からなる。
以下、上述の実施形態の効果を示す試験例を説明する。
試験例1においては、受光素子11の下方に金属板41を設けた場合と絶縁膜45を設けた場合の違いについて説明する。
図6は、横軸に高周波電流の周波数をとり、縦軸にインサーションロスをとって、受光素子の下方に設ける部材の特性が高周波電流の損失に及ぼす影響を示すグラフである。
試験例2においては、光結合装置1の受光素子11、MOSFET13及び14と、基板110の電極パッド114a及び114bとの位置関係が高周波電流の損失に及ぼす影響について説明する。
図7は、横軸に高周波電流の周波数をとり、縦軸にインサーションロスをとって、金属板と電極板との距離が高周波電流の損失に及ぼす影響を示すグラフである。
11:受光素子
11L:下面
11U:上面
11a、11b:出力端子
12:発光素子
12U:上面
12a:アノード端子
12c:カソード端子
13:MOSFET
13L:下面
13U:上面
13d:ドレイン端子
13e:ダイオード
13g:ゲート端子
13s:ソース端子
14:MOSFET
14L:下面
14U:上面
14d:ドレイン端子
14e:ダイオード
14g:ゲート端子
14s:ソース端子
21:電極板
21L:下面
21U:上面
22:電極板
22L:下面
22U:上面
23:電極板
23L:下面
23U:上面
24:電極板
24L:下面
24U:上面
25、26:接続層
31~38:ワイヤ
41:金属板
41L:下面
41U:上面
42:接着剤層
43:透光部材
44:接着剤層
45:絶縁膜
45L:下面
45U:上面
50:封止部材
50L:下面
50S:側面
50U:上面
101:高周波装置
110:基板
111:母材
112:配線
113:ビア
114a~114d:電極パッド
120:接合部材
D1、D2:距離
RF:高周波電流
Claims (10)
- 第1出力端子及び第2出力端子が設けられた受光素子と、
前記受光素子上に設けられた発光素子と、
前記受光素子の側方に設けられ、上面に第1主端子及び制御端子が設けられ、下面に第2主端子が設けられ、前記第1主端子が前記第1出力端子に接続され、前記制御端子が前記第2出力端子に接続された第1スイッチング素子と、
上面が前記第2主端子に導電性の接続層を介して接合された第1電極板と、
上面が前記受光素子の下面に接合された金属板と、
前記受光素子、前記発光素子、前記第1スイッチング素子を覆い、下面に前記第1電極板の下面及び前記金属板の下面が露出した封止部材と、
を備え、
前記第1電極板の下面、前記金属板の下面、及び、前記封止部材の下面は同一平面を構成する光結合装置。 - 第1出力端子及び第2出力端子が設けられた受光素子と、
前記受光素子上に設けられた発光素子と、
前記受光素子の側方に設けられ、上面に第1主端子及び制御端子が設けられ、下面に第2主端子が設けられ、前記第1主端子が前記第1出力端子に接続され、前記制御端子が前記第2出力端子に接続された第1スイッチング素子と、
上面が前記第2主端子に導電性の接続層を介して接合された第1電極板と、
上面が前記受光素子の下面に接合された絶縁膜と、
前記受光素子、前記発光素子、前記第1スイッチング素子を覆い、下面に前記第1電極板の下面及び前記絶縁膜の下面が露出した封止部材と、
を備え、
前記第1電極板の下面、前記絶縁膜の下面、及び、前記封止部材の下面は同一平面を構成する光結合装置。 - 前記絶縁膜の上面は絶縁性の接着剤層を介して前記受光素子の下面に接合された請求項2に記載の光結合装置。
- 前記受光素子の側方であって前記第1スイッチング素子の側方に設けられ、上面に第1主端子及び制御端子が設けられ、下面に第2主端子が設けられた第2スイッチング素子と、
上面が前記第2スイッチング素子の前記第2主端子に接続され、下面が前記封止部材の下面に露出した第2電極板と、
をさらに備え、
前記第1出力端子及び前記第2出力端子はそれぞれ一対設けられており、
前記第1スイッチング素子の前記第1主端子は、一方の前記第1出力端子に接続されており、
前記第1スイッチング素子の前記制御端子は、一方の前記第2出力端子に接続されており、
前記第2スイッチング素子の前記第1主端子は、他方の前記第1出力端子に接続されており、
前記第2スイッチング素子の前記制御端子は、他方の前記第2出力端子に接続されている請求項1~3のいずれか1つに記載の光結合装置。 - 前記第1スイッチング素子の第1主端子を前記第2スイッチング素子の第1主端子に接続する複数本のワイヤをさらに備えた請求項4に記載の光結合装置。
- 前記受光素子と前記第1スイッチング素子を最短距離で結ぶ直線は第1方向に延び、
前記第1スイッチング素子と前記第2スイッチング素子を最短距離で結ぶ直線は、前記第1方向に交差する第2方向に延び、
上方から見て、前記複数本のワイヤは前記第2方向に延びる請求項5に記載の光結合装置。 - 前記発光素子のアノード端子に接続され、下面が前記封止部材の下面において露出した第3の電極板と、
前記発光素子のカソード端子に接続され、下面が前記封止部材の下面において露出した第4の電極板と、
をさらに備えた請求項1~6のいずれか1つに記載の光結合装置。 - 前記封止部材の側面には金属製の部材が露出していない請求項1~7のいずれか1つに記載の光結合装置。
- 前記第1スイッチング素子には、周波数が10GHz以上の高周波電流が流れる請求項1~8のいずれか1つに記載の光結合装置。
- 基板と、
前記基板に搭載された請求項1~9のいずれか1つに記載の光結合装置と、
を備え、
前記基板は、前記第1電極板に接続された第1電極パッドを有し、
前記受光素子から前記第1スイッチング素子に向かう方向において、前記受光素子と前記第1スイッチング素子の中心との距離は、前記受光素子と前記第1電極パッドの中心との距離以下である高周波装置。
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