JPWO2018158650A1 - 半導体装置、および半導体装置の駆動方法 - Google Patents
半導体装置、および半導体装置の駆動方法 Download PDFInfo
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Abstract
Description
本実施の形態は、本発明の一態様の半導体装置について説明する。
図1(A)に示す半導体装置10は、電圧変換回路50、コンパレータ51、論理回路52、入力端子である端子IN、出力端子である端子BG、入力端子である端子CLA、トランジスタFE3、容量素子CA3、端子SEN、端子VCOMPを有する。電圧変換回路50は、トランジスタFE1、容量素子CA1、トランジスタFE2、および容量素子CA2を有する。
図4(A)に示す半導体装置300は、制御部41と、電圧生成部42と、電圧保持部43と、セルアレイ44と、を有する。セルアレイ44は例えば、記憶装置、CPU、または撮像装置、等の一部を構成する。セルアレイ44は一以上のOSトランジスタを有することが好ましい。また、電圧保持部43より出力される電位は、該OSトランジスタのバックゲートに与えられる。
図5には、図4(B)に示す半導体装置300の動作の一例を説明するタイミングチャートを示す。
クロックバッファ回路170は、インバータ70乃至75、端子a1乃至a3を有する。クロックバッファ回路170は、信号CLK_cpから信号CK1_cp、CKB1_cpを生成する機能を有する。端子a1は信号CLK_cpの入力端子であり、端子a2、a3は、信号CK1_cp、CKB1_cpの出力端子である。信号CLK_cpは、制御部41から出力されるクロック信号である。例えば、制御部41は、基準クロック信号を分周して、信号CLK_cpを生成する。信号CK1_cpと信号CKB1_cpとは相補関係にあるクロック信号である。
チャージポンプ160は、降圧型チャージポンプであり、電位GNDを降圧して、電位Vcp1を生成する機能を有する。なお、入力電位は電位GNDに限定されない。チャージポンプ160は、トランジスタMN61乃至MN65、容量素子C61乃至C65を有する。チャージポンプ160の段数は5であるが、段数はこれに限定されない。
図10(A)乃至(E)には、図4(A)で説明したセルアレイ44のセル(以下一例としてメモリセル)が取り得る回路構成の一例を示す。図10(A)乃至(E)に示すメモリセルの回路図では、ソース線SLあるいはビット線BLからデータ電圧を書きこみ、書き込みワード線WWL及び読み出しワード線RWLの電圧を制御することで、データ電圧の書き込みあるいは読み出しを制御することができる。
本実施の形態では、実施の形態1に示すコンパレータ51等に用いることができるコンパレータとして、2つの負電圧を直接的に比較する機能を備える半導体装置などについて説明する。本実施の形態に示すコンパレータの端子IN1、端子IN2および端子OUT1には、実施の形態1に示す端子CI、端子REFおよび端子COを適用することができる。
図12(A)は、コンパレータの構成例を示す回路図である。コンパレータ20は、端子IN1、IN2、OUT1、VH1、VL1、BIS、OSG1、およびOSG3を有する。コンパレータ20は、端子IN1の電位Vi1と端子IN2の電位Vi2とを比較する機能、および、比較結果に応じた電位レベルを持つ電位Vcmpを端子OUT1から出力する機能を有する。
ここで、トランジスタM1乃至M3がバックゲートを有さない場合を考える。トランジスタM1乃至M3のしきい値電圧(以下、Vtと呼ぶ場合がある。)は0Vよりも大きい。
ここでは、コンパレータ20の電流源として機能するトランジスタM3の変形例について示す。図12(B)に示すトランジスタM3において、バックゲートがフロントゲート、またはドレインと電気的に接続されてもよい。また、図12(B)に示すトランジスタM3に代えてバックゲートを有さないトランジスタを用いてもよい。電流源に、バックゲートを備えるトランジスタM3を用いることで、例えば、次のような効果が得られる。図12(C)から理解できるように、トランジスタM3のバックゲートに正の電位Vbg3を入力することで、電位Vbsを低くすることができ、例えばGNDとすることが可能である。電位Vbg3によって、コンパレータ20のトランスコンダクタンスを制御することができるので、コンパレータ20の高速化が図れる。
ここでは、差動対の変形例を示す。図12(B)においては、端子OBG1よりトランジスタM1およびM2に同じ電位が与えられるが、2つの端子を設け、トランジスタM1のバックゲートと、トランジスタM2のバックゲートと、に異なる電位が与えられてもよい。例えば、トランジスタM1のバックゲートおよびトランジスタM2のバックゲートに電位Vg1および電位Vbg2が与えられる。このような構成とすることで、トランジスタM1のバックゲート電位とトランジスタM2のバックゲート電位とを独立して制御することができる。トランジスタM1とトランジスタM2は、同じ電気特性をもつように設計されるが、実際には、プロセスばらつきによりトランジスタM1とトランジスタM2の電気特性は完全に一致しない。そのため、オフセット電圧がキャンセルされるように、電位Vbg1、Vbg2を決めればよい。ここで、端子OBG3に、電位Vss、Vbg1、Vbg2の何れかを入力することで、コンパレータ20が使用する電位の数を低減できる。また、電位Vbg1、電位Vbg2の一方が電位Vddであることで、コンパレータ20が使用する電位の数を低減できる。
図14(A)、図14(B)に、リセットが可能なコンパレータの構成例を示す。
本実施の形態では、半導体装置の適用例として、ICチップ、電子部品、電子機器等について説明する。
図15(A)は、電子部品の作製方法例を示すフローチャートである。電子部品は、半導体パッケージ、またはIC用パッケージともいう。この電子部品は、端子取り出し方向や、端子の形状に応じて、複数の規格や名称が存在する。そこで、本実施の形態では、その一例について説明することにする。
回路領域7102には、本発明の形態に係る半導体装置が設けられている。
a2 端子
a3 端子
C61 容量素子
C62 容量素子
C63 容量素子
C64 容量素子
C65 容量素子
C66 容量素子
CA1 容量素子
CA2 容量素子
CA3 容量素子
CA4 容量素子
CK1_cp 信号
CK1_LS 信号
CKB1_cp 信号
CL1 信号
CL2 信号
FE1 トランジスタ
FE2 トランジスタ
FE3 トランジスタ
FE4 トランジスタ
INV1 インバータ
INV2 インバータ
INV3 インバータ
LK1 端子
M1 トランジスタ
M1_Q トランジスタ
M1_QB トランジスタ
M2_A トランジスタ
M2_B トランジスタ
M3 トランジスタ
M4 トランジスタ
M5 トランジスタ
M6 トランジスタ
M61 トランジスタ
M62 トランジスタ
M63 トランジスタ
M64 トランジスタ
M65 トランジスタ
M66 トランジスタ
MN61 トランジスタ
MN62 トランジスタ
MN63 トランジスタ
MN64 トランジスタ
MN65 トランジスタ
2050 ノート型PC
S1 信号
SEN 端子
SN1 ノード
SN2 ノード
t0 時刻
t1 時刻
t2 時刻
t3 時刻
Vcp1 電位
10 半導体装置
20 コンパレータ
30 コンパレータ
31 コンパレータ
32 コンパレータ
35 コンパレータ
36 コンパレータ
41 制御部
42 電圧生成部
43 電圧保持部
44 セルアレイ
50 電圧変換回路
51 コンパレータ
52 論理回路
56 論理回路
57 クロック生成回路
70 インバータ
71 インバータ
72 インバータ
73 インバータ
74 インバータ
75 インバータ
76 インバータ
77 インバータ
78 インバータ
79 インバータ
80a チャージポンプ
150 負電位生成回路
160 チャージポンプ
161 チャージポンプ
162 チャージポンプ
163 チャージポンプ
170 クロックバッファ回路
171 クロックバッファ回路
172 LS
300 半導体装置
2010 情報端末
2011 筐体
2012 表示部
2013 操作ボタン
2014 外部接続ポート
2015 スピーカ
2016 マイクロフォン
2020 無線信号
2021 無線信号
2030 情報端末
2031 筐体
2032 表示部
2033 リュウズ
2034 ベルト
2035 検知部
2040 情報端末
2041 装着部
2042 筐体
2045 ケーブル
2046 バッテリ
2047 表示部
2051 筐体
2052 表示部
2053 キーボード
2054 ポインティングデバイス
2070 ビデオカメラ
2071 筐体
2072 表示部
2073 筐体
2074 操作キー
2075 レンズ
2076 接続部
2110 携帯型遊技機
2111 筐体
2112 表示部
2113 スピーカ
2114 LEDランプ
2115 操作キーボタン
2116 接続端子
2117 カメラ
2118 マイクロフォン
2119 記録媒体読込部
2150 電気冷凍冷蔵庫
2151 筐体
2152 冷蔵室用扉
2153 冷凍室用扉
2170 自動車
2171 車体
2172 車輪
2173 ダッシュボード
2174 ライト
7000 電子部品
7001 リード
7002 プリント基板
7004 回路基板
7100 半導体ウエハ
7102 回路領域
7104 分離領域
7106 分離線
7110 チップ
Claims (4)
- 電圧変換回路と、コンパレータと、論理回路と、トランジスタと、容量素子と、を有し、
前記電圧変換回路は、前記論理回路が出力するクロック信号に応じて、入力される第1の信号の電圧を変換した信号を第2の信号として出力する機能を有し、
前記コンパレータは、パワーゲーティング信号に応じて電源電圧の供給または停止が制御される機能を有し、
前記トランジスタは、前記トランジスタを非導通状態とする期間において前記容量素子に前記コンパレータの出力電圧を保持する機能を有し、
前記論理回路は、前記コンパレータへの電源電圧が停止する期間において、前記容量素子に保持された電圧を基に前記クロック信号の供給または停止を切り替える機能を有する、ことを特徴とする半導体装置。 - 請求項1において、前記トランジスタは、チャネル形成領域が酸化物半導体を有す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、
前記コンパレータは、前記トランジスタを導通状態とする期間において、電源電圧の供給が行わ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に記載の半導体装置の駆動方法であって、
前記トランジスタの非導通状態から導通状態への切り替えは、前記コンパレータの電源電圧の停止状態から供給状態への切り替えよりも前に行うことを特徴とする半導体装置の駆動方法。
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