JP4619004B2 - プログラマブル導電ランダムアクセスメモリ及びその検知方法 - Google Patents
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Description
Claims (56)
- 可変抵抗記憶素子の格納された値を検知する方法であって、
ディジットライン及びディジット相補ラインを、予め設定された電圧値にプリチャージし、
前記可変抵抗記憶素子と前記ディジットラインとの間に結合されたアクセストランジスタに、前記可変抵抗記憶素子を読み出すのに十分であるが、前記可変抵抗記憶素子をプログラムするのに不十分であるゲート電圧を印加し、
前記ディジットラインの電圧と、前記ディジット相補ラインの電圧とを比較して、前記可変抵抗記憶素子の論理状態を抵抗レベルで決定することを特徴とする方法。 - 前記プリチャージを実行する際に、前記ディジットライン及び前記ディジット相補ラインを約Vddにプリチャージすることを特徴とする請求項1記載の方法。
- 前記プリチャージを実行する際に、プリチャージ制御信号をプリチャージ回路で受信するとともに、前記ディジットライン及び前記ディジット相補ラインを約Vddに結合することを特徴とする請求項1記載の方法。
- 前記プリチャージを実行する際に、前記ディジットラインの電圧と前記ディジット相補ラインの電圧とを等しくすることを特徴とする請求項1記載の方法。
- 前記起動を実行する際に、前記アクセストランジスタのゲートに結合した行ラインを起動することを特徴とする請求項1記載の方法。
- 前記比較を実行する前の予め設定された期間中に前記ディジットラインの電圧をディスチャージすることを特徴とする請求項1記載の方法。
- 前記ディスチャージを実行する際に、前記予め設定された電圧に更なる電圧を加えたものにほぼ等しい電圧値から前記ディジットラインの電圧をディスチャージすることを特徴とする請求項6記載の方法。
- 前記更なる電圧が、前記アクセストランジスタに結合した前記ディジットラインと行ラインとの間の寄生容量に起因することを特徴とする請求項7記載の方法。
- 前記可変抵抗記憶素子の低抵抗レベルを読み出すことを特徴とする請求項1記載の方法。
- 前記可変抵抗記憶素子に低抵抗レベルを再書込みすることを特徴とする請求項9記載の方法。
- 前記可変抵抗記憶素子の高抵抗レベルを読み出すことを特徴とする請求項1記載の方法。
- 前記可変抵抗記憶素子の第2端子に電圧を印加し、その電圧を0Vと予め設定された電圧との間とすることを特徴とする請求項1記載の方法。
- 前記印加を実行する際に、前記電圧をセルプレートに印加して、前記可変抵抗記憶素子の前記第2端子に結合することを特徴とする請求項12記載の方法。
- 可変抵抗メモリセルを読み出す方法であって、
前記可変抵抗メモリセルの抵抗素子の第1部分に結合した前記可変抵抗メモリセルのセルプレートの電圧を、第1の予め設定された電圧に設定し、
前記可変抵抗メモリセルのアクセストランジスタの第1端子及び基準導体を、第2の予め設定された電圧にチャージし、前記第1端子を前記可変抵抗メモリセルの列ラインに結合し、前記トランジスタの第2端子を前記抵抗素子の第2部分に結合し、前記第1端子及び前記基準導体を、コンパレータの入力に結合し、
前記可変抵抗メモリセルを読み出すために、前記アクセストランジスタのゲートを、第3の予め設定された電圧にチャージし、前記ゲートを、前記可変抵抗メモリセルの行ラインに結合し、前記第3の予め設定された電圧が、前記可変抵抗メモリセルを読み出すのに十分であるが前記可変抵抗メモリセルをプログラムするのに不十分であり、
前記第1端子を、前記抵抗素子を通じて、前記予め設定された電圧からディスチャージし、
前記可変抵抗メモリセルの論理状態を決定するために、ディスチャージを実行した後の予め設定された期間中に前記第1端子の電圧と前記第2の予め設定された電圧とを比較することを特徴とする方法。 - 前記第2の予め設定された電圧を、前記第1の予め設定された電圧より高くすることを特徴とする請求項14記載の方法。
- 前記放電を実行する際に、前記第1端子を、前記第2の予め設定された電圧と僅かにことなる第4の予め設定された電圧からディスチャージし、前記第4の予め設定された電圧が、前記列ラインに関連した寄生容量に起因することを特徴とする請求項14記載の方法。
- 前記第3の予め設定された電圧を、前記可変抵抗メモリセルが読み出された後に前記可変抵抗メモリセルに前記抵抗レベルを再書込みするのに十分なレベルにチャージすることを特徴とする請求項14記載の方法。
- 前記チャージを実行する際に、前記第3の予め設定された電圧を前記第2の予め設定された電圧まで増大することを特徴とする請求項17記載の方法。
- 前記増大を実行する際に、前記第3の予め設定された電圧のレベルを約Vddまで増大することを特徴とする請求項18記載の方法。
- 前記可変抵抗メモリセルに前記高抵抗レベルを再書込みすることを特徴とする請求項17記載の方法。
- 前記設定を行う際に、前記セルプレートの電圧を約Vddに設定することを特徴とする請求項14記載の方法。
- 前記設定を行う際に、前記セルプレートの電圧を約Vdd/2に設定することを特徴とする請求項14記載の方法。
- トランジスタの第1端子をチャージする際に、前記第1端子及び前記基準導体を約Vddにチャージすることを特徴とする請求項14記載の方法。
- ゲートをチャージする際に、前記抵抗素子を読み出すのに十分である値であるが前記可変抵抗メモリセルをプログラムすることができる値より下の値に前記ゲートをチャージすることを特徴とする請求項14記載の方法。
- 前記ゲートをチャージする際に、前記ゲートを、前記第1の予め設定された電圧と前記第2の予め設定された電圧との間の電圧レベルにチャージすることを特徴とする請求項24記載の方法。
- 前記第1端子をディスチャージする際に、前記第1端子を、約Vddに更なる電圧を加えたものからディスチャージすることを特徴とする請求項16記載の方法。
- 前記第1端子をディスチャージする際に、前記第1端子を、約Vddに約0.1Vを加えたものからディスチャージすることを特徴とする請求項26記載の方法。
- 前記比較を実行する際に、前記ディスチャージの実行の開始後の約15〜30nsに前記第1端子の電圧と前記第2の予め設定された電圧とを比較することを特徴とする請求項14記載の方法。
- 前記可変抵抗メモリセルが論理ハイ状態を有するのを決定することを特徴とする請求項14記載の方法。
- 前記可変抵抗メモリセルが論理ロー状態を有するのを決定することを特徴とする請求項14記載の方法。
- 可変抵抗メモリセルの格納された値を検知する方法であって、
前記可変抵抗メモリセルのアクセストランジスタの第1端子に結合したディジットラインを、第1の予め設定した電圧にプリチャージし、
前記可変抵抗メモリセルのセルプレートを第2の予め設定された電圧にチャージし、前記第2の予め設定された電圧を、0Vと前記第1の予め設定された電圧との間とし、
前記アクセストランジスタのゲートに結合した行ラインに第3の予め設定された電圧を印加して、前記可変抵抗メモリセルの両端間の結果的に得られる電圧が、前記可変抵抗メモリセルの論理状態を読み出すのに十分であるが、前記可変抵抗メモリセルをプログラムするのには不十分であることを特徴とする方法。 - 可変抵抗メモリセルの格納された値を検知する方法であって、
ディジットラインを基準電圧値にプリチャージし、前記ディジットラインを、前記可変抵抗メモリセルのアクセストランジスタの第1端子に結合し、
前記可変抵抗メモリセルのセルプレートを第1の予め設定された電圧にチャージし、前記第1の予め設定された電圧を、0Vと前記基準電圧値との間の値とし、
前記可変抵抗メモリセルの行ラインを、第2の予め設定された電圧を印加することによって起動し、前記第2の予め設定された電圧が、前記可変抵抗メモリセルを読み出すのに十分であるが、前記可変抵抗メモリセルをプログラムするのに不十分であり、
前記可変抵抗メモリセルの論理状態を決定するために、前記ディジットラインで読み出された電圧と、前記基準電圧とを比較することを特徴とする方法。 - 可変抵抗メモリ構造であって、
ディジットライン及びディジット相補ラインと、
読出し動作前に、前記ディジットライン及びディジット相補ラインを、予め設定された電圧値にプリチャージする回路と、
読出し動作中に可変抵抗記憶素子を前記ディジットラインに結合するアクセストランジスタと、
当該可変抵抗メモリ構造を読み出すのに十分であるが、前記可変抵抗メモリ構造をプログラムするのに不十分である、前記アクセストランジスタのゲート電圧を供給する行ラインと、
前記読出し動作中に前記ディジットラインの電圧と前記ディジット相補ラインの電圧とを比較して、前記可変抵抗記憶素子の論理状態を抵抗レベルで決定するセンス増幅器とを具えることを特徴とする可変抵抗メモリ構造。 - 前記予め設定された電圧を約Vddとしたことを特徴とする請求項33記載の構造。
- 前記可変抵抗記憶素子が、第1及び第2電極を有するカルコゲニドガラスを含むことを特徴とする請求項33記載の構造。
- 前記カルコゲニドガラスがGe,Se及びAg組成を有することを特徴とする請求項35記載の構造。
- 前記ディジットラインと前記メモリ構造の行ラインとの間に可変寄生容量を更に具え、前記読出し動作中、前記可変寄生容量によって、前記ディジットラインが、前記予め設定された電圧より高い電圧レベルにチャージされることを特徴とする請求項33記載の構造。
- 前記ディジット相補ラインを、前記可変抵抗メモリセルに関連するメモリアレイとは異なるメモリアレイに関連させることを特徴とする請求項33記載の構造。
- 前記ディジットライン及び前記ディジット相補ラインを前記予め設定された電圧に等しくする等化回路を更に具えることを特徴とする請求項33記載の構造。
- 可変抵抗記憶素子と、
列ラインと、
行ラインと、
前記プログラマブル導電記憶素子の第1端子に第1電圧を印加する導体と、
前記行ラインに印加されるゲート電圧に応答して前記可変抵抗記憶素子の他の端子に前記列ラインを選択的に結合するトランジスタであって、前記ゲート電圧が、前記可変抵抗記憶素子を読み出すのに十分であるが、前記可変抵抗記憶素子をプログラムするのに不十分である、トランジスタと、
前記列ライン及び基準導体に結合したセンス増幅器と、
前記行ラインにゲート電圧を印加する前に、前記列ライン及び基準導体を、予め設定された電圧にプリチャージするプリチャージ回路とを具え、
前記センス増幅器が、前記ゲート電圧を前記行ラインに印加した後に前記可変抵抗記憶素子の抵抗値を決定するために前記列ラインの電圧と基準ラインの電圧とを比較することを特徴とする半導体メモリ。 - 前記第1電圧を、0Vと約Vddとの間の電圧としたことを特徴とする請求項40記載のメモリ。
- 前記可変抵抗記憶素子が、第1及び第2電極を有するカルコゲニドガラスを含むことを特徴とする請求項40記載のメモリ。
- 前記カルコゲニドガラスがGe,Se及びAg組成を有することを特徴とする請求項42記載のメモリ。
- 前記列ラインに関連した可変寄生容量を更に具え、前記可変寄生容量によって、前記列ラインが、前記行ラインに印加される前記ゲート電圧に応答して前記プリチャージ回路によって印加される前記予め設定された電圧より高い電圧レベルにチャージされることを特徴とする請求項40記載のメモリ。
- 前記可変寄生容量によって、前記列ラインが、前記プリチャージ回路によって印加される前記予め設定された電圧より高い約0.1Vにチャージされることを特徴とする請求項44記載のメモリ。
- 前記センス増幅器が、
Nセンス増幅器と、
前記Nセンス増幅器に結合されたPセンス増幅器とを具え、
前記Nセンス増幅器及び前記Pセンス増幅器が、前記列ラインの電圧値と前記基準導体の電圧値とを比較することを特徴とする請求項40記載のメモリ。 - 前記基準導体を、前記記憶素子に関連したメモリアレイと異なるメモリアレイに関連させることを特徴とする請求項40記載のメモリ。
- 前記基準導体に関連したダミー行ラインを更に具え、前記ダミー行ラインが、通常はダミー行ライン電圧で起動され、前記ゲート電圧が前記行ラインに印加されると、前記ダミー行ラインが不作動状態になり、前記基準導体の前記予め設定された電圧が、前記ダミー行ラインに関連した列ラインの寄生容量によって減少することを特徴とする請求項40記載のメモリ。
- プロセッサと、
前記プロセッサに結合した可変抵抗記憶素子からなる半導体メモリ構造とを具え、
前記半導体メモリ構造が、
ディジットライン及びディジット相補ラインと、
読出し動作前に、前記ディジットライン及び前記ディジット相補ラインを、予め設定された電圧値にプリチャージする回路と、
読出し動作中に前記可変抵抗記憶素子を前記ディジットラインに結合するアクセストランジスタと、
前記可変抵抗記憶素子を読み出すのに十分であるが、前記可変抵抗記憶素子をプログラムするのに不十分である、前記アクセストランジスタのゲート電圧を供給する行ラインと、
前記可変抵抗記憶素子の論理状態を抵抗レベルで決定するために前記読出し動作中に前記ディジットラインの電圧と前記ディジット相補ラインの電圧とを比較するセンス増幅器とを具えることを特徴とするプロセッサシステム。 - 前記予め設定された電圧を約Vddとしたことを特徴とする請求項49記載のシステム。
- 前記可変抵抗記憶素子が、第1及び第2電極を有するカルコゲニドガラスを含むことを特徴とする請求項49記載のシステム。
- 前記カルコゲニドガラスがGe,Se及びAg組成を有することを特徴とする請求項51記載のシステム。
- 前記可変抵抗記憶素子の前記ディジットラインと行ラインとの間の可変寄生容量を更に具え、前記可変寄生容量によって、前記ディジットラインが、前記読出し動作中に前記予め設定された電圧より高い電圧レベルにチャージされることを特徴とする請求項49記載のシステム。
- 前記ディジット相補ラインを、前記可変抵抗記憶素子に関連したメモリアレイと異なるメモリアレイに関連させることを特徴とする請求項49記載のシステム。
- プロセッサと、
前記プロセッサに結合した半導体メモリとを具え、
前記半導体メモリが、
可変抵抗記憶素子と、
列ラインと、
行ラインと、
前記可変抵抗記憶素子の第1端子に第1電圧を印加する導体と、
前記行ラインに印加されるゲート電圧に応答して、前記可変抵抗記憶素子の他の端子に前記列ラインを選択的に結合するトランジスタであって、前記ゲート電圧が、前記可変抵抗記憶素子を読み出すのに十分であるが、前記可変抵抗記憶素子をプログラムするのに不十分である、トランジスタと、
前記列ライン及び基準導体に結合したセンス増幅器と、
前記行ラインにゲート電圧を印加する前に、前記列ライン及び基準導体を、予め設定された電圧にプリチャージするプリチャージ回路とを有し、
前記センス増幅器が、前記ゲート電圧が前記行ラインに印加された後に前記可変抵抗記憶素子の抵抗値を決定するために前記列ラインの電圧と基準ラインの電圧とを比較することを特徴とするプロセッサシステム。 - 可変抵抗記憶素子からなる半導体メモリセルを読み出す方法であって、
ディジットライン及びディジット相補ラインを、予め設定された電圧値にプリチャージし、
前記可変抵抗記憶素子と前記ディジットラインとの間に結合されたアクセストランジスタに、前記可変抵抗記憶素子を読み出すのに十分であるが、前記可変抵抗記憶素子をプログラムするのに不十分であるゲート電圧を印加し、
前記ディジットラインの電圧と、前記ディジット相補ラインの電圧とを比較して、前記可変抵抗記憶素子の論理状態を抵抗レベルで決定することを特徴とする方法。
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- 2003-02-10 CN CN2008100915787A patent/CN101261880B/zh not_active Expired - Lifetime
- 2003-02-10 KR KR1020047012895A patent/KR100626508B1/ko active IP Right Grant
- 2003-02-18 TW TW092103281A patent/TW587250B/zh not_active IP Right Cessation
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2004
- 2004-08-16 US US10/918,386 patent/US6954385B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
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WO2003071549A1 (en) | 2003-08-28 |
CN101261880A (zh) | 2008-09-10 |
CN100483545C (zh) | 2009-04-29 |
JP2005518627A (ja) | 2005-06-23 |
US6954385B2 (en) | 2005-10-11 |
US20030156463A1 (en) | 2003-08-21 |
KR100626508B1 (ko) | 2006-09-20 |
CN101261880B (zh) | 2011-06-15 |
US6791885B2 (en) | 2004-09-14 |
CN1647210A (zh) | 2005-07-27 |
ATE396482T1 (de) | 2008-06-15 |
EP1476877B1 (en) | 2008-05-21 |
DE60321138D1 (de) | 2008-07-03 |
TW587250B (en) | 2004-05-11 |
AU2003210901A1 (en) | 2003-09-09 |
TW200303549A (en) | 2003-09-01 |
US20050018493A1 (en) | 2005-01-27 |
KR20040096587A (ko) | 2004-11-16 |
EP1476877A1 (en) | 2004-11-17 |
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