JP2008193668A - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP2008193668A JP2008193668A JP2008000350A JP2008000350A JP2008193668A JP 2008193668 A JP2008193668 A JP 2008193668A JP 2008000350 A JP2008000350 A JP 2008000350A JP 2008000350 A JP2008000350 A JP 2008000350A JP 2008193668 A JP2008193668 A JP 2008193668A
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Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/22—Capacitive coupling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/24—Inductive coupling
- H04B5/26—Inductive coupling using coils
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/77—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for interrogation
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Thin Film Transistor (AREA)
- Semiconductor Integrated Circuits (AREA)
- Electronic Switches (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
【解決手段】複数の容量部によって形成された保持容量部において、前記複数の容量部の接続を並列接続した状態で充電を行い、回路動作の際にはそのときに必要とされる電源電圧に応じて、前記複数の容量部の一部もしくは全てを直列接続として高電圧を取り出す。これにより、搬送波の受信電力が下がった際、つまりはタグとリーダ/ライタの距離が離れた際にもタグ内部の回路動作に必要な電圧を保証することが出来るため、通信距離の向上に大きく寄与する。同時に、タグ内で高い駆動電圧を必要とする回路にも良好な電源供給を可能とする。
【選択図】図1
Description
本発明の実施の形態について、図面を用いて以下に説明する。ただし、本発明は以下の説明によって狭義に限定されるものではなく、本発明の趣旨およびその範囲から逸脱することなくその形態および詳細を様々に変更し得ることは当業者であれば容易に理解される。従って、本発明は以下に示す実施の形態の記載内容に限定して解釈されるものではない。なお、以下に説明する本発明の構成において、同一のものを指す符号は異なる図面間で共通して用いる場合がある。
本実施形態においては、本発明の半導体装置を用いたICカードの構成例について、図3を用いて説明する。
107 スイッチ
108 スイッチ
109 スイッチ
201 リーダ/ライタ
202 搬送波
203 RFIDタグ
204 アンテナ
205 整流回路部
206 保持容量部
207 機能部
300 ICカード
301 リーダ/ライタ
302 搬送波
303 アンテナ
304 共振回路
305 クロック生成回路
306 変調/復調回路
307 点線枠
308 ロジック回路
309 マスクROM部
310 書き換え型メモリ部
700 整流回路部
701 第1の保持容量部
702 第2の保持容量部
1301 基板
1302 絶縁膜
1303 剥離層
1304 絶縁膜
1305 半導体膜
1306 ゲート絶縁膜
1307 ゲート電極
1308 不純物領域
1309 不純物領域
1310 絶縁膜
1311 不純物領域
1313 導電膜
1314 絶縁膜
1316 導電膜
1317 導電膜
1318 絶縁膜
1319 素子形成層
1320 シート材
1321 シート材
1300a 薄膜トランジスタ
1300b 薄膜トランジスタ
1300c 薄膜トランジスタ
1300e 薄膜トランジスタ
1300f 容量素子
1305a 半導体膜
1305c 半導体膜
1305f 半導体膜
1307a 導電膜
1307b 導電膜
1312a 絶縁膜
1312b 絶縁膜
Claims (7)
- 搬送波を受信することで交流電圧を生成するアンテナと、前記交流電圧が入力されると直流電圧を生成する整流回路と、前記直流電圧を保持する保持容量部とを有し、
前記保持容量部は、複数の容量部と、前記複数の容量部が全て並列接続となる第1のモードと、前記複数の容量部のうち一部あるいは全てを直列接続とする第2のモードとを切り替える複数のスイッチング手段と、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、
前記整流回路または前記保持容量部は、薄膜トランジスタを用いることを特徴とする半導体装置。 - 搬送波を受信することで交流電圧を生成するアンテナと、前記交流電圧が入力されると直流電圧を生成する整流回路と、前記直流電圧を保持する保持容量部と、受信した前記搬送波に含まれる命令に応じて処理を行う機能部とを有し、
前記保持容量部は、複数の容量部と、前記保持容量部に電荷の蓄積を行う期間において前記複数の容量部が全て並列接続となる第1のモードと、前記保持容量部に蓄積された電荷によって前記機能部の駆動を行う期間において前記複数の容量部のうち一部あるいは全てを直列接続とする第2のモードとを切り替える複数のスイッチング手段と、を有することを特徴とする半導体装置。 - 請求項3において、
前記整流回路、前記保持容量部または前記機能部は、薄膜トランジスタを用いることを特徴とする半導体装置。 - 搬送波を受信することで交流電圧を生成するアンテナと、前記交流電圧が入力されると直流電圧を生成する整流回路と、前記直流電圧を保持する第1の保持容量部および第2の保持容量部と、前記第1の保持容量部から得られる電力を用い、受信した前記搬送波に含まれる命令に応じて処理を行う第1の機能部と、前記第2の保持容量部から得られる電力を用い、前記第1の機能部よりも高い駆動電圧を要求する第2の機能部とを有し、
前記第2の保持容量部は、複数の容量部と、前記第2の保持容量部が有する前記複数の容量部が全て並列接続となる第1のモードと、前記第2の保持容量部が有する前記複数の容量部のうち一部あるいは全てを直列接続とする第2のモードとを切り替える複数のスイッチング手段とを有することを特徴とする半導体装置。 - 請求項5において、
前記整流回路、前記第1の保持容量部、前記第2の保持容量部、前記第1の機能部または前記第2の機能部は、薄膜トランジスタを用いることを特徴とする半導体装置。 - 請求項5または請求項6において、
前記第2の機能部は、書き換え可能なメモリ素子群を有することを特徴とする半導体装置。
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