JP2021522639A - メモリビットセルの動作のための方法、システムおよびデバイス - Google Patents
メモリビットセルの動作のための方法、システムおよびデバイス Download PDFInfo
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- G11C13/0002—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using resistive RAM [RRAM] elements
- G11C13/0021—Auxiliary circuits
- G11C13/0023—Address circuits or decoders
- G11C13/0026—Bit-line or column circuits
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/02—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements
- G11C11/16—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using elements in which the storage effect is based on magnetic spin effect
- G11C11/165—Auxiliary circuits
- G11C11/1653—Address circuits or decoders
- G11C11/1655—Bit-line or column circuits
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/02—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements
- G11C11/16—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using elements in which the storage effect is based on magnetic spin effect
- G11C11/165—Auxiliary circuits
- G11C11/1653—Address circuits or decoders
- G11C11/1657—Word-line or row circuits
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- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/02—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements
- G11C11/16—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using elements in which the storage effect is based on magnetic spin effect
- G11C11/165—Auxiliary circuits
- G11C11/1673—Reading or sensing circuits or methods
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
- G11C13/0002—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using resistive RAM [RRAM] elements
- G11C13/0021—Auxiliary circuits
- G11C13/0023—Address circuits or decoders
- G11C13/0028—Word-line or row circuits
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
- G11C13/0002—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using resistive RAM [RRAM] elements
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- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/06—Sense amplifiers; Associated circuits, e.g. timing or triggering circuits
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- G—PHYSICS
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- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
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- G11C11/5614—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency using conductive bridging RAM [CBRAM] or programming metallization cells [PMC]
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- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
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- G11C11/5678—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency using amorphous/crystalline phase transition storage elements
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- G11C11/56—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency
- G11C11/5685—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency using storage elements comprising metal oxide memory material, e.g. perovskites
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/06—Auxiliary circuits, e.g. for writing into memory
- G11C16/26—Sensing or reading circuits; Data output circuits
- G11C16/28—Sensing or reading circuits; Data output circuits using differential sensing or reference cells, e.g. dummy cells
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
- G11C13/0002—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using resistive RAM [RRAM] elements
- G11C13/0021—Auxiliary circuits
- G11C13/004—Reading or sensing circuits or methods
- G11C2013/0042—Read using differential sensing, e.g. bit line [BL] and bit line bar [BLB]
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- G11C2207/068—Integrator type sense amplifier
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- Crystallography & Structural Chemistry (AREA)
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- Techniques For Improving Reliability Of Storages (AREA)
Abstract
Description
λTFはトーマスフェルミ遮蔽長であり、
Cは定数である。
ACeRamはCES素子の横断面積であり、
Jreset(VMI)は、臨界電圧VMIでCES素子に印加されてCES素子を絶縁状態に入れることになるCES素子を通る電流密度である。
aBはボーア半径である。
102 第1のメモリ素子
106 コンデンサ
110 ビットセル回路
112 第2のメモリ素子
116 コンデンサ
122 基準ノード
124 基準ノード
126 基準ノード
128 基準ノード
130 基準ノード
132 基準ノード
140 入出力回路
150 回路
160 回路
202 プロット
204 プロット
206 プロット
208 時間
402 読出しウィンドウ
404 プロットの領域、プロットの一部分
406 プロットの一部分
408 プロットの点
410 書込みウィンドウ
424 可変インピーダデバイス
426 可変抵抗器
428 可変コンデンサ
bl ビット線
IE1 インピーダンス素子
IE2 インピーダンス素子
M1 NFET
M2 NFET
nbl ビット線
N1 NFET
N3 NFET
N4 NFET
N5 NFET
N11 NFET
N15 NFET
P1 PFET
P2 PFET
P3 PFET
P4 PFET
P5 PFET
R 抵抗
RE 読出しイネーブル信号
SA ダブルエンド型センスアンプ
SA1 シングルエンド型センスアンプ
SA2 シングルエンド型センスアンプ
Vdd 電圧源
WL ワード線
Claims (18)
- 相補インピーダンス状態を有し、前記相補インピーダンス状態が集合的に2進シンボル、値、条件またはパラメータを表す、第1のメモリ素子および第2のメモリ素子であって、前記第1のメモリ素子の第1の端子および前記第2のメモリ素子の第1の端子が1つまたは複数の基準ノードに結合される、第1のメモリ素子および第2のメモリ素子と、
前記第1のメモリ素子の第2の端子に結合される第1のビット線と、
前記第2のメモリ素子の第2の端子に結合される第2のビット線と、
前記第1および第2のビット線の充電速度の差に応じて前記相補インピーダンス状態を検出する回路と、
を備えるデバイス。 - 前記検出された相補インピーダンス状態を単一の前記2進シンボル、値、条件またはパラメータにマッピングする回路を更に備える、請求項1に記載のデバイス。
- 前記第1および第2のメモリ素子が、2つの独立した2進シンボル、値、条件またはパラメータを表す2つの独立したインピーダンス状態を有するように構成可能である、請求項1または2に記載のデバイス。
- 前記第1のメモリ素子のインピーダンス状態を検出する第1のセンスアンプおよび前記第2のメモリ素子のインピーダンス状態を検出する第2のセンスアンプを更に備える、請求項3に記載のデバイス。
- 読出し動作において前記第1および第2のビット線に結合されることになる1つまたは複数の電圧源を更に備える、請求項1から4のいずれか一項に記載のデバイス。
- 前記第1のメモリ素子が絶縁または高インピーダンス状態にあり、かつ前記第2のメモリ素子が導電または低インピーダンス状態にある場合、前記第1のビット線上の電圧の振幅が前記第2のビット線上の電圧の振幅より高い速度で増加する、請求項2から5のいずれか一項に記載のデバイス。
- 前記第1および第2のビット線の前記充電速度の前記差に応じて前記相補インピーダンス状態を検出する前記回路が、前記第1のビット線に結合される第1のインバータ回路および前記第2のビット線に結合される第2のインバータを備える、請求項1から6のいずれか一項に記載のデバイス。
- 前記第1および第2のメモリ素子の前記第1の端子がワード線電圧に応じて前記1つまたは複数の基準ノードに結合される、請求項1から7のいずれか一項に記載のデバイス。
- 前記相補インピーダンス状態を検出する前記回路が、
前記第1のメモリ素子が絶縁または高インピーダンス状態にあり、かつ前記第2のメモリ素子が導電または低インピーダンス状態にあることに応じて、前記第1のビット線を第1の電圧源に結合する第1の導電素子と、
前記第1のメモリ素子が前記絶縁または高インピーダンス状態にあり、かつ前記第2のメモリ素子が前記導電または低インピーダンス状態にあることに応じて、前記第2のビット線を第1の基準ノードに結合する第2の導電素子と、
を更に備える、請求項1から8のいずれか一項に記載のデバイス。 - 前記相補インピーダンス状態を検出する前記回路が、
前記第1のメモリ素子が前記絶縁または高インピーダンス状態にあり、かつ前記第2のメモリ素子が前記導電または低インピーダンス状態にあることに応じて、前記第1のビット線を第2の基準ノードから分離する第3の導電素子と、
前記第1のメモリ素子が前記絶縁または高インピーダンス状態にあり、かつ前記第2のメモリ素子が前記導電または低インピーダンス状態にあることに応じて、前記第2のビット線を第2の電圧源から分離する第4の導電素子と、
を更に備える、請求項9に記載のデバイス。 - 前記相補インピーダンス状態を検出する前記回路が、前記第1のビット線の電圧または前記第2のビット線上の電圧に基づいて前記相補インピーダンス状態を更に検出する、請求項9または10に記載のデバイス。
- 前記第1のビット線が第1のインピーダンス素子を通じて電圧源に結合され、かつ前記第2のビット線が第2のインピーダンス素子を通じて前記電圧源に結合され、前記第1および第2のインピーダンス素子のインピーダンスが、低インピーダンスまたは導電インピーダンス状態にある間の前記第1および第2のメモリ素子のインピーダンスと一致する、請求項1から11のいずれか一項に記載のデバイス。
- 前記第1および第2のメモリ素子が第1および第2の相関電子スイッチ(CES)素子を備える、請求項1から12のいずれか一項に記載のデバイス。
- 第1のビット線であり、第1のメモリ素子に接続される、第1のビット線を1つまたは複数の電圧源に結合するステップと、
第2のビット線であり、第2のメモリ素子に接続される、第2のビット線を前記1つまたは複数の電圧源に結合するステップであって、前記第1および第2のメモリ素子が、2進シンボル、値、条件またはパラメータを集合的に表す相補インピーダンス状態にある、ステップと、
少なくとも部分的に、前記第1および第2の電圧源への前記第1および第2のビット線の前記結合に応じた前記第1および第2のビット線の充電速度の差に基づいて前記相補インピーダンス状態を検出するステップと、
を含む方法。 - 前記検出された相補インピーダンス状態を単一の前記2進シンボル、値、条件またはパラメータにマッピングするステップを更に含む、請求項14に記載の方法。
- 前記第1のビット線および前記第2のビット線を前記1つまたは複数の電圧源に結合する前に前記第1および第2のビット線を放電するステップを更に含む、請求項14または15に記載の方法。
- 前記相補インピーダンス状態を検出するステップが、
前記第1のメモリ素子が絶縁または高インピーダンス状態にあり、かつ前記第2のメモリ素子が導電または低インピーダンス状態にあることに応じて、前記第1のビット線を第1の電圧源に結合するステップと、
前記第1のメモリ素子が前記絶縁または高インピーダンス状態にあり、かつ前記第2のメモリ素子が前記導電または低インピーダンス状態にあることに応じて、前記第2のビット線を第1の基準ノードに結合するステップと、
を更に含む、請求項14から16のいずれか一項に記載の方法。 - ビットセルのアレイとして形成され、各ビットセルが第1および第2のメモリ素子を備え、各ビットセルが第1のビット線および第2のビット線によって少なくとも1つの他のビットセルに結合される、複数のビットセルであって、前記第1のメモリ素子および第2のメモリ素子が相補インピーダンス状態を有し、前記相補インピーダンス状態が集合的に2進シンボル、値、条件またはパラメータを表す、複数のビットセルと、
前記第1および第2のビット線の充電速度の差に応じて前記複数のビットセルのうち選択された1つの第1および第2のメモリ素子の前記相補インピーダンス状態を検出する少なくとも1つの回路と、
を備える装置。
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