JP2015187905A - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP2015187905A JP2015187905A JP2015047224A JP2015047224A JP2015187905A JP 2015187905 A JP2015187905 A JP 2015187905A JP 2015047224 A JP2015047224 A JP 2015047224A JP 2015047224 A JP2015047224 A JP 2015047224A JP 2015187905 A JP2015187905 A JP 2015187905A
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Classifications
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- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- G11C11/34—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices
- G11C11/40—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors
- G11C11/401—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors forming cells needing refreshing or charge regeneration, i.e. dynamic cells
- G11C11/406—Management or control of the refreshing or charge-regeneration cycles
-
- 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
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- G11C11/24—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using capacitors
-
- 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
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- G11C11/34—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices
- G11C11/40—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors
- G11C11/401—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors forming cells needing refreshing or charge regeneration, i.e. dynamic cells
- G11C11/4063—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing
- G11C11/407—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing for memory cells of the field-effect type
- G11C11/409—Read-write [R-W] circuits
- G11C11/4091—Sense or sense/refresh amplifiers, or associated sense circuitry, e.g. for coupled bit-line precharging, equalising or isolating
-
- 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
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- G11C11/34—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices
- G11C11/40—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors
- G11C11/401—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors forming cells needing refreshing or charge regeneration, i.e. dynamic cells
- G11C11/4063—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing
- G11C11/407—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing for memory cells of the field-effect type
- G11C11/409—Read-write [R-W] circuits
- G11C11/4093—Input/output [I/O] data interface arrangements, e.g. data buffers
Abstract
【解決手段】酸化物半導体膜を用いたメモリをリフレッシュする際に駆動する回路として、センスアンプ回路240と、ラッチ回路242と、第1のスイッチ244と、第2のスイッチ245とを有する。リフレッシュ動作の際は、メモリに記憶されている電位を反映した電位が、センスアンプ回路240に入力され、センスアンプ回路240の出力がラッチ回路242に入力され、ラッチ回路242の出力が、酸化物半導体をチャネルとして有する第1のトランジスタ201及び第1のスイッチ244を介して、再びメモリに書き込まれる。
【選択図】図1
Description
本実施の形態では、開示する発明の一態様に係る半導体装置(記憶装置)の回路構成およびその動作について、図1乃至図3を参照して説明する。本実施の形態では、メモリセル内の酸化物半導体トランジスタとしてn型トランジスタ(nチャネル型トランジスタ)を用い、メモリセル内のシリコントランジスタとしてp型トランジスタ(pチャネル型トランジスタ)を用いる場合について説明する。なお、シリコントランジスタはn型トランジスタ(nチャネル型トランジスタ)であってもよい。
図5に、図1に示した半導体装置を用いた、m×nビットの記憶容量を有する半導体装置の回路図の一例を示す。
実施の形態1ではリフレッシュ動作について説明した。本発明の半導体装置はリフレッシュ動作以外にも、書き込み、読み出し、保持を行う。本形態ではリフレッシュ動作以外の動作について図6乃至図8を用いて説明する。図6で示す各素子の符号は図1と同一である。
本実施の形態では、上記実施の形態で説明した、オフ電流の低い書き込み用の第1のトランジスタの半導体層に用いることのできる酸化物半導体層について説明する。書き込み用の第1のトランジスタ以外のトランジスタ、例えば、読み出し用の第2のトランジスタ、第1のスイッチ乃至第3のスイッチ、センスアンプ回路、ラッチ回路で用いられるトランジスタ等にも、以下で説明する酸化物半導体層をチャネル層として用いることは可能である。
本実施の形態では、開示する発明の一態様に係る半導体装置に用いられるトランジスタの断面構造の一例について、図面を参照して説明する。
上記実施の形態で開示された、導電膜や半導体膜はスパッタ法により形成することができるが、他の方法、例えば、熱CVD法により形成してもよい。熱CVD法の例としてMOCVD(Metal Organic Chemical Vapor Deposition)法やALD(Atomic Layer Deposition)法を使っても良い。
本実施の形態では、上述の実施の形態で説明した半導体装置を電子部品に適用する例、及び該電子部品を具備する電子機器に適用する例について、図14、図15を用いて説明する。
202 第2のトランジスタ
264 容量
281 ノード
213 第1の配線
211 第2の配線
221 第3の配線
212 第4の配線
214 第5の配線
248 第6の配線
240 センスアンプ回路
242 ラッチ回路
244 第1のスイッチ
245 第2のスイッチ
247 第3のスイッチ
252 電源
200 メモリセル
250 回路
Claims (3)
- メモリセルと、センスアンプ回路と、ラッチ回路と、第1のスイッチと、第2のスイッチと、駆動回路とを有し、
前記センスアンプ回路と、前記ラッチ回路と、前記第1のスイッチと、前記第2のスイッチとは、前記メモリセルのリフレッシュ動作の際に駆動し、
前記メモリセルは、第1のトランジスタと、第2のトランジスタと、容量とを有し、
前記第1のトランジスタは、チャネル形成領域として酸化物半導体を有し、
前記第1のトランジスタのソースまたはドレインの一方は、第1の配線に電気的に接続され、
前記第1のトランジスタのソースまたはドレインの他方は、前記容量の一方の端子に電気的に接続され、
前記第1のトランジスタのソースまたはドレインの他方は、前記第2のトランジスタのゲートに電気的に接続され、
前記第2のトランジスタのソースまたはドレインの一方は、前記第1の配線に電気的に接続され、
前記第1のトランジスタのゲートは、第2の配線に電気的に接続され、
前記容量の他方の端子は、第3の配線に電気的に接続され、
前記第2のトランジスタのソースまたはドレインの他方は、第4の配線に電気的に接続され、
前記センスアンプ回路の第1の入力端子は、前記第1の配線に電気的に接続され、
前記センスアンプ回路の出力端子は、前記ラッチ回路の入力端子に電気的に接続され、
前記ラッチ回路の出力端子は、前記第1のスイッチの一方の端子に電気的に接続され、
前記第1のスイッチの他方の端子は、前記第1の配線に電気的に接続され、
前記第2のスイッチの一方の端子は、前記第1の配線に電気的に接続され、
前記第2のスイッチの他方の端子は、前記駆動回路に電気的に接続されることを特徴とする半導体装置。 - 請求項1において、
前記リフレッシュ動作において、
第1の電位は、前記第2のトランジスタのゲートの電位を反映した前記第1の配線の電位であり、
前記第1の電位が前記センスアンプ回路の前記第1の入力端子に入力され、
前記第1の電位が前記センスアンプ回路に入力されることで、前記センスアンプ回路は前記ラッチ回路に信号を出力し、
前記センスアンプ回路の出力が前記ラッチ回路に入力され、ラッチ動作が行われ、
前記第1のスイッチ、前記第1の配線及び前記第1のトランジスタを介して、前記ラッチ回路からの出力である第2の電位が、前記第2のトランジスタのゲート及び前記容量の一方の端子に入力されることを特徴とする半導体装置。 - 請求項1または請求項2において、
前記第1のトランジスタが有する前記酸化物半導体は、インジウムと亜鉛とを有することを特徴とする半導体装置。
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