JP2021027118A - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
- Publication number
- JP2021027118A JP2021027118A JP2019142839A JP2019142839A JP2021027118A JP 2021027118 A JP2021027118 A JP 2021027118A JP 2019142839 A JP2019142839 A JP 2019142839A JP 2019142839 A JP2019142839 A JP 2019142839A JP 2021027118 A JP2021027118 A JP 2021027118A
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- Prior art keywords
- side wall
- conductive film
- semiconductor device
- base member
- msl
- 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.)
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Abstract
Description
最初に、本開示の実施形態を列記して説明する。本開示の半導体装置は、半導体素子と、半導体素子を収容するパッケージとを備える。パッケージは、半導体素子を搭載する領域を含む導電性の主面を有するベース部材と、ベース部材の主面上に設けられ、半導体素子を搭載する領域を囲む誘電体の側壁と、該領域を間に挟む側壁の一対の部分上それぞれに設けられた第1の導電膜と、一対の部分のうち一方の部分上の第1の導電膜に導電接合された導電性の第1リードと、一対の部分のうち他方の部分上の第1の導電膜に導電接合された導電性の第2リードとを有する。半導体素子は、一対の部分それぞれに設けられた第1の導電膜と電気的に接続されている。側壁はベース部材と対向する面に凹みを有し、一対の部分のうち少なくとも一方の部分における第1の導電膜下の側壁とベース部材との間に、凹みによる空隙が存在する。
本開示の半導体装置の具体例を、以下に図面を参照しつつ説明する。なお、本発明はこれらの例示に限定されるものではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味及び範囲内でのすべての変更が含まれることが意図される。以下の説明では、図面の説明において同一の要素には同一の符号を付し、重複する説明を省略する。
図5は、上記実施形態の一変形例に係る半導体装置1Bの断面図であって、図2のIII−III線に対応する断面を示している。本変形例では、上記実施形態と異なり、凹み103の内面(底面及び側面)に導電膜14が設けられていない。言い換えると、凹み103の底面は、空気のみを介してベース部材5の主面5aと対向している。
図6は、上記実施形態に係る半導体装置1A、及び上記変形例に係る半導体装置1Bについて、導電膜12の内側部分12b(TRL)における反射特性(S11)を見積もった結果を示すグラフ(ポーラチャート)である。図6において、角度位置は位相を表し、径方向位置は大きさ(振幅)を表す。図中において、グラフG11は空隙104が設けられない比較例の半導体装置の特性を示し、グラフG12は上記実施形態の(空隙104内に導電膜14が設けられた)半導体装置1Aの特性を示し、グラフG13は上記変形例の(空隙104内に導電膜14が設けられない)半導体装置1Bの特性を示す。周波数は100MHz〜5.1GHzである。グラフの右端(100MHz)から出発して、それぞれのグラフG11〜G13の回転量が電気長に相当する。これらのグラフG11〜G13から明らかなように、空隙104内に導電膜14が設けられた半導体装置1Aにおいては、空隙104が設けられない場合と比べて電気長が顕著に長くなり、空隙104内に導電膜14が設けられない半導体装置1Bにおいては、空隙104が設けられない場合と比べて電気長が顕著に短くなる。なお、これらの電気長は、空隙104の高さ(凹み103の深さ)、及び方向D1における空隙104の幅を変更することによって調整することが可能である。
図7及び図8は、上記実施形態の半導体装置1Aを配線基板上に実装した装置(図4の(b)を参照)、及び空隙104が設けられない比較例の半導体装置を配線基板上に実装した装置(図4の(a)を参照)のそれぞれについて、周波数900MHzでシミュレーションを行った実施例を示すグラフである。図7は伝送特性(S21)の周波数依存性を示す。図8は、反射特性(S11)を示すスミスチャートである。図8において、周波数は400MHz〜1.4GHzである。これらの図において、グラフG21は空隙104が設けられない比較例の半導体装置の特性を示し、グラフG22は上記実施形態の(空隙104内に導電膜14が設けられた)半導体装置1Aの特性を示す。これらの図を参照すると、上記実施形態の半導体装置1Aにおいて、配線基板のMSLを短くしたにもかかわらず、伝送特性(S21)及び反射特性(S11)が比較例と殆ど変わらないことがわかる。
図9及び図10は、上記変形例の半導体装置1Bを配線基板上に実装した装置、及び空隙104が設けられない比較例の半導体装置を配線基板上に実装した装置のそれぞれについて、周波数4.7GHzでシミュレーションを行った実施例を示すグラフである。図9は伝送特性(S21)の周波数依存性を示す。図10は、反射特性(S11)を示すスミスチャートである。図10において、周波数は3GHzから6GHzである。これらの図において、グラフG31は空隙104が設けられない比較例の半導体装置の特性を示し、グラフG32は上記変形例の(空隙104内に導電膜14が設けられない)半導体装置1Bの特性を示す。なお、変形例の半導体装置(グラフG31)では、配線パターン203(図4)の長さを比較例(グラフG32)の1/3とした。これらの図を参照すると、上記変形例の半導体装置1Bにおいて、配線基板のMSLを短くしたにもかかわらず、伝送特性(S21)及び反射特性(S11)が比較例と殆ど変わらないことがわかる。
3 パッケージ
5 ベース部材
5a 主面
10 側壁
10a 空洞(キャビティ)
10b 下面
10c 上面
11,12 第1の導電膜
12a 外側部分
12b 内側部分
14 第2の導電膜
14a 部分
21 入力リード
22 出力リード
31 トランジスタ
32 整合回路
41〜43 ボンディングワイヤ
101,102 部分
103 凹み
104 空隙
201 配線基板
203 配線パターン
205 キャパシタ
D1,D2 方向
Claims (9)
- 半導体素子と、
前記半導体素子を収容するパッケージと、
を備え、
前記パッケージは、
半導体素子を搭載する領域を含む導電性の主面を有するベース部材と、
前記ベース部材の前記主面上に設けられ、前記半導体素子を搭載する領域を囲む誘電体の側壁と、
前記領域を間に挟む前記側壁の一対の部分上それぞれに設けられた第1の導電膜と、
前記一対の部分のうち一方の部分上の前記第1の導電膜に導電接合された導電性の第1リードと、
前記一対の部分のうち他方の部分上の前記第1の導電膜に導電接合された導電性の第2リードと、
を有し、
前記半導体素子は、前記一対の部分それぞれに設けられた前記第1の導電膜と電気的に接続されており、
前記側壁は前記ベース部材と対向する面に凹みを有し、前記一対の部分のうち少なくとも一方の部分における前記第1の導電膜下の前記側壁と前記ベース部材との間に、前記凹みによる空隙が存在する、半導体装置。 - 前記凹みの内面に第2の導電膜が設けられており、
前記第2の導電膜は前記ベース部材の前記主面と電気的に接続されている、請求項1に記載の半導体装置。 - 前記第1の導電膜、前記側壁、及び前記ベース部材の前記主面がマイクロストリップラインを構成し、
前記主面の法線方向において前記空隙と重なる部位における当該マイクロストリップラインの特性インピーダンスは、他の部位における当該マイクロストリップラインの特性インピーダンスに対して少なくとも10%小さい、請求項2に記載の半導体装置。 - 前記凹みの内面に導電膜が設けられていない、請求項1に記載の半導体装置。
- 前記第1の導電膜、前記側壁、及び前記ベース部材の前記主面がマイクロストリップラインを構成し、
前記主面の法線方向において前記空隙と重なる部位における当該マイクロストリップラインの特性インピーダンスは、他の部位における当該マイクロストリップラインの特性インピーダンスに対して少なくとも10%大きい、請求項4に記載の半導体装置。 - 前記側壁の延在方向と交差する方向における前記空隙の幅は、該方向における前記側壁の幅の半分以上である、請求項1から請求項5のいずれか1項に記載の半導体装置。
- 前記側壁の延在方向と交差する方向における前記空隙の両端のうち少なくとも一方が閉じている、請求項1から請求項6のいずれか1項に記載の半導体装置。
- 前記凹みが形成された部位における前記側壁の厚さは、他の部位における前記側壁の厚さの30%以上である、請求項1から請求項7のいずれか1項に記載の半導体装置。
- 前記側壁の延在方向における前記空隙の幅が該方向における前記第1の導電膜の幅よりも長く、前記主面の法線方向から見て、前記側壁の延在方向における前記第1の導電膜の両端から前記空隙がはみ出している、請求項1から請求項8のいずれか1項に記載の半導体装置。
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