JP6174781B2 - 高電圧モニタリングを行う逐次比較型アナログ・デジタル変換器 - Google Patents
高電圧モニタリングを行う逐次比較型アナログ・デジタル変換器 Download PDFInfo
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- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/3605—Implantable neurostimulators for stimulating central or peripheral nerve system
- A61N1/36125—Details of circuitry or electric components
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- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
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- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/3605—Implantable neurostimulators for stimulating central or peripheral nerve system
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- H—ELECTRICITY
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- H—ELECTRICITY
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- H03M1/38—Analogue value compared with reference values sequentially only, e.g. successive approximation type
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- H—ELECTRICITY
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- H03M1/34—Analogue value compared with reference values
- H03M1/38—Analogue value compared with reference values sequentially only, e.g. successive approximation type
- H03M1/46—Analogue value compared with reference values sequentially only, e.g. successive approximation type with digital/analogue converter for supplying reference values to converter
- H03M1/466—Analogue value compared with reference values sequentially only, e.g. successive approximation type with digital/analogue converter for supplying reference values to converter using switched capacitors
- H03M1/468—Analogue value compared with reference values sequentially only, e.g. successive approximation type with digital/analogue converter for supplying reference values to converter using switched capacitors in which the input S/H circuit is merged with the feedback DAC array
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
- H03M1/68—Digital/analogue converters with conversions of different sensitivity, i.e. one conversion relating to the more significant digital bits and another conversion to the less significant bits
- H03M1/682—Digital/analogue converters with conversions of different sensitivity, i.e. one conversion relating to the more significant digital bits and another conversion to the less significant bits both converters being of the unary decoded type
- H03M1/685—Digital/analogue converters with conversions of different sensitivity, i.e. one conversion relating to the more significant digital bits and another conversion to the less significant bits both converters being of the unary decoded type the quantisation value generators of both converters being arranged in a common two-dimensional array
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- H—ELECTRICITY
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- H03M1/66—Digital/analogue converters
- H03M1/74—Simultaneous conversion
- H03M1/80—Simultaneous conversion using weighted impedances
- H03M1/802—Simultaneous conversion using weighted impedances using capacitors, e.g. neuron-mos transistors, charge coupled devices
- H03M1/804—Simultaneous conversion using weighted impedances using capacitors, e.g. neuron-mos transistors, charge coupled devices with charge redistribution
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Description
本発明は、幅広い用途で使用できる逐次比較型アナログ・デジタル変換器に関するものであり、具体的には、特に機能的電気刺激(FES)用途における高電圧刺激電極モニタリングに関するものである。
本願明細書は、例えば、以下の項目も提供する。
(項目1)
スイッチドキャパシターアレイであって、総容量値C2を有するスイッチドキャパシターアレイと、
演算増幅器又はコンパレーターとして選択的に構成可能な差動増幅器であって、前記差動増幅器が第1及び第2入力及び出力を有し、前記第1入力が基準電圧に連結され、前記スイッチドキャパシターアレイが前記差動増幅器の前記第2入力及び出力を介して連結される、差動増幅器と、
前記差動増幅器の第2入力と、デジタル出力信号に変換されるべきアナログ電圧信号を提供するように適合されたアナログ電源との間で切り替え可能に連結された入力キャパシターであって、容量値C1を有する、入力キャパシターと、
前記スイッチドキャパシターアレイ及び前記差動増幅器出力に連結され、前記デジタル出力信号を提供するように構成された逐次比較型レジスターと、
(a)前記入力キャパシターを前記アナログ電圧信号の値まで充電し、サンプリング間隔中に演算増幅器として前記差動増幅器を構成することにより、仮想接地が前記差動増幅器の第2入力に確立され、前記入力キャパシターから前記スイッチドキャパシターアレイへの電荷転送を容易にすることと、
(b)転送間隔中に、C1/C2比を乗じた、前記入力キャパシターの前記アナログ電圧信号を前記キャパシターアレイに転送することと、
(c)前記基準電圧と前記スイッチドキャパシターアレイの前記電圧とを比較するためのコンパレーターとして前記差動増幅器を構成することと、を行うようにしたタイミング制御論理信号を提供するように構成された論理信号発生器と、を含む、アナログ・デジタル変換器(ADC)であって、アナログ・デジタル変換間隔中に、逐次比較型プロトコルでの前記コンパレーターの出力に従って前記逐次比較型レジスターに格納するために、前記キャパシターアレイの前記電圧をデジタル出力ビットに変換して、前記デジタル出力信号を提供するように、前記スイッチドキャパシターアレイ内の前記キャパシターが切り替えられる、ADC。
(項目2)
前記タイミング制御論理が、前記サンプリング間隔を制御するための第1論理信号と、前記転送間隔を制御するための第2論理信号と、前記アナログ・デジタル変換間隔を制御するための第3論理信号と、を含み、前記論理信号が論理状態「1」及び「0」を有し、対応の論理信号によって制御されるスイッチが、対応の制御論理信号が論理「1」であるときに閉じられ、対応の制御論理信号が「0」であるときに開かれる、項目1に記載のADC。
(項目3)
前記第1論理信号によって制御され、前記アナログ電圧信号を前記入力キャパシターに切り替え可能に連結するように構成された、第1スイッチを更に含む、項目2に記載のADC。
(項目4)
第2論理信号によって構成され、前記入力キャパシターを接地に切り替え可能に連結するように構成された、第2スイッチによって制御された第2スイッチを更に含む、項目2に記載のADC。
(項目5)
前記第3論理信号によって制御され、前記入力キャパシターを通じて、前記アナログ電圧信号を前記差動増幅器の第2入力に、切り替え可能に連結するように構成された、第3スイッチを更に含む、項目2に記載のADC。
(項目6)
前記第1論理信号によって制御され、前記第1論理信号が論理「1」であるときに、前記差動増幅器をオペアンプとして構成するように、前記差動増幅器の出力を前記差動増幅器の第2入力に連結するように構成された、第4スイッチを更に含む、項目2に記載のADC。
(項目7)
前記第1論理信号が論理「0」であり、前記第2論理信号が論理「1」であるときに、前記スイッチドキャパシターアレイ内の前記キャパシターが、前記差動増幅器の出力及び第2入力を介して連結されるように構成された、項目2に記載のADC。
(項目8)
変換期中に、前記タイミング制御論理により、前記第3論理信号のタイミングが論理「0」になり、前記差動増幅器がコンパレーターとして構成され、前記キャパシターアレイの前記電圧がデジタル出力ビットに変換される、項目2に記載のADC。
(項目9)
前記転送間隔中に、前記入力キャパシターの前記アナログ電圧信号が、(a)C2の値がC1の値を超えるときに、C1/C2比によって減衰され、(b)C2の値がC1の値未満であるときに、C1/C2比によって増幅される、項目1に記載のADC。
(項目10)
前記第3論理信号が論理「1」のときに、前記差動増幅器をオペアンプとして構成し、前記第3論理信号が論理「0」のときに、前記差動増幅器をコンパレーターとして構成する方法で、前記第3論理信号が前記差動増幅器に連結される、項目2に記載のADC。
(項目11)
アナログ・デジタル変換器を利用して、アナログ信号をデジタル等価信号に変換する方法であって、前記変換器が、オペアンプ又はコンパレーターとして構成可能な差動増幅器であって、前記差動増幅器が第1及び第2入力並びに出力を有し、基準電圧が前記第1入力に連結される、差動増幅器と、前記第2入力及び前記出力を介して連結されたキャパシターアレイであって、前記キャパシターアレイが総容量値C2を有する、キャパシターアレイと、アナログ信号源と前記第2入力との間で切り替え可能に連結された入力キャパシターであって、前記入力キャパシターが容量値C1を有する、入力キャパシターと、前記スイッチドキャパシターアレイ及び前記差動増幅器出力に連結された逐次比較型レジスターと、サンプリング間隔の定義と、転送間隔の定義と、アナログ・デジタル変換間隔の定義と、をそれぞれ行うためのタイミング制御論理信号を提供するように構成された論理信号発生器と、を含み、
前記サンプリング間隔中に、前記入力キャパシターの前記アナログ信号をサンプリングし、前記差動増幅器がオペアンプとして構成されることと、
前記転送間隔中に、C1/C2比を乗じた、前記入力キャパシターの前記サンプリングした信号を前記スイッチドキャパシターアレイに転送することであって、前記差動増幅器がオペアンプとして構成されることと、
前記差動増幅器をコンパレーターとして構成し、アナログ・デジタル変換間隔中に、逐次比較型プロトコルでの前記コンパレーター出力に従って前記逐次比較型レジスターに格納するために、前記キャパシターアレイの電圧をデジタル出力ビットに変換して、前記デジタル等価信号を提供することと、を含む、方法。
(項目12)
複数のリード線であって、それぞれ少なくとも1つの電極を含む、複数のリード線と、
逐次比較型アナログ・デジタル変換器及び一体型スイッチドキャパシターアレイを含むアナログ・デジタル変換器であって、前記逐次変換型アナログ・デジタル変換器及び前記一体型スイッチドキャパシター増幅器が共通の差動増幅器を共有する、アナログ・デジタル変換器と、
1つ又は複数の電気パルスを生成するように構成されたパルス発生器であって、前記電気パルスが、少なくとも1つの電極に伝送されるように、前記パルス発生器が前記リード線に接続される、パルス発生器と、を含む、末梢埋め込み型神経刺激システム。
(項目13)
逐次比較型レジスターを更に含む、項目12に記載の末梢埋め込み型神経刺激システム。
(項目14)
前記逐次比較型レジスターが論理信号発生器を含む、項目13に記載の末梢埋め込み型神経刺激システム。
(項目15)
第1期中にオペアンプとして動作するように前記差動増幅器に指示する第1信号を生成し、第2期中にコンパレーターとして動作するように前記差動増幅器に指示する第2信号を生成するように、論理信号発生器が構成された、項目14に記載の末梢埋め込み型神経刺激システム。
(項目16)
前記リード線と前記アナログ・デジタル変換器との間の入力キャパシターを更に含み、前記入力キャパシターが前記第1期中に充電される、項目15に記載の末梢埋め込み型神経刺激システム。
(項目17)
前記第1期中、かつ前記入力キャパシターの充電後に、前記入力キャパシターが放電され、電荷がスイッチドキャパシターアレイに転送される、項目16に記載の末梢埋め込み型神経刺激システム。
(項目18)
1つ又は複数の電気パルスを生成するように構成されたパルス発生器と、
1つ又は複数の電気パルスを出力するように設定された電極アレイと、
前記電極アレイの少なくとも1つの電極に関連付けられたアナログ信号をデジタル信号に変換するように構成された、アナログ・デジタル変換器であって、再構成可能な差動増幅器を含むアナログ・デジタル変換器と、
演算増幅器モードとコンパレーターモードとの間で前記差動増幅器を再構成するように構成されたコントローラと、を含む、埋め込み型電気刺激システム。
(項目19)
前記アナログ・デジタル変換器が、共通の差動増幅器を共有する逐次比較型アナログ・デジタル変換器及びスイッチドキャパシター増幅器を含む、項目18に記載の埋め込み型電気刺激システム。
(項目20)
逐次比較型レジスターを更に含む、項目19に記載の埋め込み型電気刺激システム。
(項目21)
第1期中にオペアンプとして動作するように前記再構成可能な差動増幅器に指示する第1信号を生成し、第2期中にコンパレーターとして動作するように前記差動増幅器に指示する第2信号を生成するように、前記コントローラが構成された、項目18に記載の埋め込み型電気刺激システム。
(項目22)
前記リード線及び前記アナログ・デジタル変換器を連結する入力キャパシターを更に含み、前記入力キャパシターが前記第1期中に充電される、項目21に記載の埋め込み型電気刺激システム。
(項目23)
前記第1期中、かつ前記入力キャパシターの充電の後に、前記入力キャパシターが放電され、電荷がスイッチドキャパシターアレイに転送される、項目22に記載の埋め込み型電気刺激システム。
(項目24)
埋め込み型パルス発生器及び少なくとも1つの電極によって、神経に隣接する、又は神経にある体内組織に、少なくとも1つの電気パルスを送達することと、
演算増幅器モードで構成された差動増幅器を使用して、前記少なくとも1つの電気パルスのアナログ属性を感知することと、
コンパレーターモードで構成された前記差動増幅器を使用して、前記感知したアナログ属性をデジタル信号に変換することと、を含む、神経障害性疼痛の治療方法。
(項目25)
前記少なくとも1つの電気パルスを送達することが、前記少なくとも1つの電気パルスを末梢神経に近接する、又は末梢神経にある周囲体組織に送達することを含む、項目24に記載の方法。
(項目26)
前記電気パルスが第1特性を有する、項目24に記載の方法。
(項目27)
前記デジタル信号が、短絡又は開回路の有無を示す、項目26に記載の方法。
(項目28)
第2特性を有する第2電気パルスを送達することを更に含み、前記第2電気パルスの前記第2特性が、前記電気パルス及び前記デジタル信号の前記第1特性に基づいている、項目27に記載の方法。
(項目29)
前記デジタル信号が、前記少なくとも1つの電極の電圧を示す、項目26に記載の方法。
(項目30)
第2特性を有する第2電気パルスを送達することを更に含み、前記第2電気パルスの前記第2特性が、前記電気パルス及び前記デジタル信号の前記第1特性に基づいている、項目29に記載の方法。
Φ1=1の場合、B(k)=1及びB(k)b=0
Φ2=1の場合、B(k)=0及びB(k)b=0
Φ3=0の場合、B(k)及びB(k)bは相補的である
前記の表で、「k」は0〜10である。
Claims (12)
- 複数のリード線であって、それぞれ少なくとも1つの電極を含む、複数のリード線と、
逐次比較型アナログ・デジタル変換器及び一体型スイッチドキャパシター増幅器を含むアナログ・デジタル変換器であって、前記逐次比較型アナログ・デジタル変換器及び前記一体型スイッチドキャパシター増幅器が共通の差動増幅器を共有する、アナログ・デジタル変換器と、
前記リード線と前記アナログ・デジタル変換器との間の入力キャパシターと、
1つ又は複数の電気パルスを生成するように構成されたパルス発生器であって、前記電気パルスが、少なくとも1つの電極に伝送されるように、前記パルス発生器が前記リード線に接続される、パルス発生器と、を含む、神経刺激システム。 - 逐次比較型レジスターを更に含む、請求項1に記載の神経刺激システム。
- 前記逐次比較型レジスターが論理信号発生器を含む、請求項2に記載の神経刺激システム。
- 第1期中にオペアンプとして動作するように前記差動増幅器に指示する第1信号を生成し、第2期中にコンパレーターとして動作するように前記差動増幅器に指示する第2信号を生成するように、前記論理信号発生器が構成された、請求項3に記載の神経刺激システム。
- 前記入力キャパシターが前記第1期中に充電される、請求項4に記載の神経刺激システム。
- 前記第1期中、かつ前記入力キャパシターの充電後に、前記入力キャパシターが放電され、電荷がスイッチドキャパシターアレイに転送される、請求項5に記載の神経刺激システム。
- 1つ又は複数の電気パルスを生成するように構成されたパルス発生器と、
前記1つ又は複数の電気パルスを出力するように構成された電極アレイと、
前記電極アレイの少なくとも1つの電極に関連付けられたアナログ信号をデジタル信号に変換するように構成された、アナログ・デジタル変換器であって、再構成可能な差動増幅器を含むアナログ・デジタル変換器と、
リード線及び前記アナログ・デジタル変換器を連結する入力キャパシターと、
演算増幅器モードとコンパレーターモードとの間で前記差動増幅器を再構成するように構成されたコントローラと、を含む、埋め込み型電気刺激システム。 - 前記アナログ・デジタル変換器が、共通の差動増幅器を共有する逐次比較型アナログ・デジタル変換器及びスイッチドキャパシター増幅器を含む、請求項7に記載の埋め込み型電気刺激システム。
- 逐次比較型レジスターを更に含む、請求項8に記載の埋め込み型電気刺激システム。
- 第1期中にオペアンプとして動作するように前記再構成可能な差動増幅器に指示する第1信号を生成し、第2期中にコンパレーターとして動作するように前記差動増幅器に指示する第2信号を生成するように、前記コントローラが構成された、請求項7に記載の埋め込み型電気刺激システム。
- 前記入力キャパシターが前記第1期中に充電される、請求項10に記載の埋め込み型電気刺激システム。
- 前記第1期中、かつ前記入力キャパシターの充電の後に、前記入力キャパシターが放電され、電荷がスイッチドキャパシターアレイに転送される、請求項11に記載の埋め込み型電気刺激システム。
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