JP2013033917A - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP2013033917A JP2013033917A JP2012090391A JP2012090391A JP2013033917A JP 2013033917 A JP2013033917 A JP 2013033917A JP 2012090391 A JP2012090391 A JP 2012090391A JP 2012090391 A JP2012090391 A JP 2012090391A JP 2013033917 A JP2013033917 A JP 2013033917A
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Abstract
【解決手段】低電位基準回路部LVおよび高電位基準回路部HVを構成する絶縁分離された半導体素子の外周に、n型ガードリング42c等を形成する。また、活性層2cにて構成されるn-型層42a等の中にp型ウェル42d等を形成し、このp型ウェル42d内に半導体素子を形成する。また、外部電源61に接続されるラインを電源供給ラインとガードリング端子固定ラインとを分岐し、電源供給ラインの電流が流れないガードリング端子固定ラインに抵抗63を備えることで、バイパスコンデンサ64をディスクリート部品としなくても良い回路構成とする。
【選択図】図5
Description
本発明の第1実施形態について説明する。本実施形態では、半導体装置として、モータ等を駆動するためのインバータドライバICが1チップ上に構成された場合を例に挙げて説明する。
本発明の第2実施形態について説明する。本実施形態は、第1実施形態に対してバイパスコンデンサ64の構成を変更したものであり、その他に関しては第1実施形態と同様であるため、第1実施形態と異なる部分についてのみ説明する。
上記第2実施形態では、トレンチ分離構造3がトレンチ内の酸化膜およびPoly−Siにて埋め込んだ構造によって構成される場合について説明したが、より大きな容量を得るためにトレンチ分離構造3を構成する材料を変更しても良い。
本発明の第3実施形態について説明する。本実施形態は、第2実施形態に対してバイパスコンデンサ64の構成を変更したものであり、その他に関しては第2実施形態と同様であるため、第2実施形態と異なる部分についてのみ説明する。
本発明の第4実施形態について説明する。本実施形態も、第2実施形態に対してバイパスコンデンサ64の構成を変更したものであり、その他に関しては第2実施形態と同様であるため、第2実施形態と異なる部分についてのみ説明する。
上記各実施形態では、n型ガードリング32c、42c、43cとして、半導体素子の外周全体を囲む構造を例に挙げたが、半導体素子の外周全体でなくとも、外周の一部に形成することでも変位電流の引き抜き効果を得ることができる。
2 SOI基板
2c 活性層
3 トレンチ分離構造
32 高耐圧MOSFET
32c n型ガードリング
32d p型ウェル
42 pチャネル型MOSFET
43 キャパシタ
42c、43c n型ガードリング
60 ガードリング端子
61 外部電源
62 レギュレータ
63 抵抗
64 バイパスコンデンサ
66、67 n+型コンタクト領域
Claims (15)
- 半導体基板に備えられた半導体素子(32、42、43)と、
前記半導体基板に形成され、前記半導体素子の外周全体または外周の一部に形成されたガードリング(32c、42c、43c)を有すると共に、
電源(61)が発生する電圧に基づいて前記半導体素子に対して第1定電圧(VC)を印加する電源供給ラインと、前記ガードリングとの接続端子となるガードリング端子(60)に対して第2定電圧(GR)を印加するガードリング端子固定ラインとを有し、
前記電源から前記電源供給ラインと前記ガードリング端子固定ラインとが分岐し、分岐した前記ガードリング端子固定ラインに前記カードリングに並列にバイパスコンデンサ(64)が備えられていると共に、前記ガードリング端子固定ラインにおける前記電源から前記バイパスコンデンサ間に抵抗(63)が備えられていることを特徴とする半導体装置。 - 前記電源供給ラインにおける前記電源から前記半導体素子の間よりも前記ガードリング端子固定ラインにおける前記電源から前記バイパスコンデンサ間の方が前記抵抗によって抵抗値が高くされていることを特徴とする請求項1に記載の半導体装置。
- 半導体層(2c)と支持基板(2a)と埋込絶縁膜(2b)から構成されるSOI基板(2)からなる半導体基板を有し、
前記半導体層内に半導体素子(32、42、43)が形成されていると共に、該半導体素子が絶縁分離領域(3)によって囲まれた素子形成領域に形成された半導体装置において、
前記半導体層内に、前記半導体層とは異なる導電型の第1導電型の第1ウェル(32d、42d、43d)を有し、
前記半導体素子は、前記第1ウェル内に形成されており、
前記第1ウェルの外周全体または外周の一部に、前記半導体層よりも導電率が高いガードリング(32c、42c、43c)を有すると共に、
電源(61)が発生する電圧に基づいて前記半導体素子に対して第1定電圧(VC)を印加する電源供給ラインと、前記ガードリングとの接続端子となるガードリング端子(60)に対して第2定電圧(GR)を印加するガードリング端子固定ラインとを有し、
前記電源から前記電源供給ラインと前記ガードリング端子固定ラインとが分岐し、分岐した前記ガードリング端子固定ラインに抵抗(63)およびバイパスコンデンサ(64)が備えられ、前記ガードリング端子の電位が前記抵抗と前記バイパスコンデンサとの間の電位に固定されることを特徴とする半導体装置。 - 第1導電型の基板上に第2導電型の半導体層が形成された半導体基板を有し、
前記半導体層内に半導体素子(32、42、43)が形成された半導体装置において、
前記半導体層内に、該半導体層とは異なる導電型である第1導電型の第1ウェル(32d、42d、43d)を有し、
前記半導体素子は、前記第1ウェル内に形成され、
前記第1ウェルの外周全体または外周の一部に、かつ、前記半導体層よりも導電率が高いガードリング(32c、42c、43c)を有すると共に、
電源(61)が発生する電圧に基づいて前記半導体素子に対して第1定電圧(VC)を印加する電源供給ラインと、前記ガードリングとの接続端子となるガードリング端子(60)に対して第2定電圧(GR)を印加するガードリング端子固定ラインとを有し、
前記電源から前記電源供給ラインと前記ガードリング端子固定ラインとが分岐し、分岐した前記ガードリング端子固定ラインに抵抗(63)およびバイパスコンデンサ(64)が備えられ、前記ガードリング端子の電位が前記抵抗と前記バイパスコンデンサとの間の電位に固定されることを特徴とする半導体装置。 - 前記半導体素子を囲むように前記半導体層に形成したトレンチ内に絶縁膜を配置することで前記半導体素子が形成される素子形成領域を形成し、該素子形成領域を該素子形成領域の外部から絶縁分離するトレンチ分離構造(3)を備え、該トレンチ分離構造によって前記バイパスコンデンサが構成されていることを特徴とする請求項1ないし4のいずれか1つに記載の半導体装置。
- 前記トレンチ分離構造は、少なくとも2重構造で形成されており、
前記半導体層のうち前記トレンチ分離構造の間に配置される部分の表面に第1コンタクト領域(66)が備えられ、前記抵抗から前記ガードリング端子、前記ガードリング、前記トレンチ分離構造にて構成される前記バイパスコンデンサ、前記半導体層のうち前記トレンチ分離構造の間に配置される部分、前記第1コンタクト領域を順に通じる経路を含んで前記ガードリング端子固定ラインが構成されていることを特徴とする請求項5に記載の半導体装置。 - 前記トレンチ分離構造は、多重構造で構成されており、
前記バイパスコンデンサは、多重構造とされた該トレンチ分離構造が並列接続された構造とされていることを特徴とする請求項5または6に記載の半導体装置。 - 前記トレンチ分離構造は、前記トレンチ側面に形成された酸化膜(3a)と該酸化膜(3a)よりも誘電率の高い高誘電率膜(3b)とを前記絶縁膜として用いて、前記トレンチ内を埋め込んだ構造とされていることを特徴とする請求項5ないし7のいずれか1つに記載の半導体装置。
- 前記トレンチ分離構造は、前記絶縁膜として前記トレンチの両側面に形成された酸化膜(3a)と、該酸化膜(3a)の表面に配置されたPoly−Si(3c)とを有し、前記酸化膜および前記Poly−Siによって前記トレンチ内が埋め込まれた構造とされており、
前記Poly−Siの表面に第2コンタクト領域(67)が形成され、該第2コンタクト領域を通じた経路で前記ガードリング端子固定ラインが構成され、前記トレンチの両側面に形成された前記酸化膜によって2つの容量を構成することで前記バイパスコンデンサが構成されていることを特徴とする請求項5ないし7のいずれか1つに記載の半導体装置。 - 前記トレンチ分離構造は、上面形状が四角形、八角形および円形のいずれか1つの形状とされていることを特徴とする請求項5ないし9のいずれか1つに記載の半導体装置。
- 前記半導体基板上に形成された、ポリシリコンと絶縁膜およびポリシリコンの積層構造により構成されるポリシリコンキャパシタ、もしくはメタルと絶縁膜およびメタルの積層構造により構成されるメタルキャパシタによって前記バイパスコンデンサが構成されていることを特徴とする請求項1ないし10のいずれか1つに記載の半導体装置。
- 前記ポリシリコン間もしくは前記メタル間に配置された絶縁膜が酸化膜よりも誘電率の高い高誘電率膜によって構成されていることを特徴とする請求項11に記載の半導体装置。
- 前記半導体基板上に前記半導体素子が複数備えられており、
前記バイパスコンデンサは、複数の前記半導体素子毎に個々に備えられていることを特徴とする請求項1ないし12のいずれか1つに記載の半導体装置。 - 前記抵抗は、配線抵抗と薄膜抵抗および拡散抵抗のいずれか1つもしくはいずれか複数の組み合わせによって構成されていることを特徴とする請求項1ないし13のいずれか1つに記載の半導体装置。
- 前記ガードリング(32c、42c、43c)は、前記第1ウェルよりも深く形成されていることを特徴とする請求項1ないし14のいずれか1つに記載の半導体装置。
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US20130009272A1 (en) | 2013-01-10 |
DE102012211547A1 (de) | 2013-01-10 |
JP5724934B2 (ja) | 2015-05-27 |
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