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    • 2. 发明授权
    • Feedback amplifier circuit operable at low voltage by utilizing switched operational amplifier and chopper modulator
    • 反馈放大器电路通过利用开关运算放大器和斩波调制器在低电压下工作
    • US07589587B2
    • 2009-09-15
    • US11896899
    • 2007-09-06
    • Takeshi YoshidaYoshihiro MasuiAtsushi IwataKunihiko Gotoh
    • Takeshi YoshidaYoshihiro MasuiAtsushi IwataKunihiko Gotoh
    • H03F1/02
    • H03F3/387H03F3/45475H03F3/45977H03F2200/261H03F2203/45136H03F2203/45212
    • In a feedback amplifier circuit, a first switching device executes an auto-zero operation by inputting a signal outputted from an amplifier to an input terminal of the amplifier during an auto-zero operation interval prior to an amplification interval. A first capacitor accumulates and holds an offset voltage at the output terminal of the amplifier during the auto-zero operation interval, and cancels an offset voltage at the input terminal of the amplifier by an accumulated and held offset voltage during an amplification interval subsequent to the auto-zero operation interval. A second switching device grounds the feedback point of the feedback circuit during the auto-zero operation interval. A second capacitor blocks a DC voltage, and accumulates and holds an offset voltage at an output terminal of the amplifier, and cancels an offset voltage at an input terminal of the amplifier by the accumulated and held offset voltage during an amplification interval.
    • 在反馈放大器电路中,第一开关器件在放大间隔之前的自动归零操作间隔期间,通过将从放大器输出的信号输入到放大器的输入端子来执行自动归零操作。 第一电容器在自动归零操作间隔期间在放大器的输出端积累并保持偏移电压,并且在放大器的输出端之后的放大间隔期间通过累积和保持的偏移电压来消除放大器的输入端的偏移电压 自动归零运行间隔。 第二开关装置在自动归零操作间隔期间将反馈电路的反馈点接地。 第二电容器阻塞DC电压,并且在放大器的输出端累积并保持偏移电压,并且在放大间隔期间通过累积和保持的偏移电压来消除放大器输入端的偏移电压。
    • 3. 发明申请
    • Feedback amplifier circuit operable at low voltage by utilizing switched operational amplifier and chopper modulator
    • 反馈放大器电路通过利用开关运算放大器和斩波调制器在低电压下工作
    • US20080106330A1
    • 2008-05-08
    • US11896899
    • 2007-09-06
    • Takeshi YoshidaYoshihiro MasuiAtsushi IwataKunihiko Gotoh
    • Takeshi YoshidaYoshihiro MasuiAtsushi IwataKunihiko Gotoh
    • H03F3/38
    • H03F3/387H03F3/45475H03F3/45977H03F2200/261H03F2203/45136H03F2203/45212
    • In a feedback amplifier circuit, a first switching device executes an auto-zero operation by inputting a signal outputted from an amplifier to an input terminal of the amplifier during an auto-zero operation interval prior to an amplification interval. A first capacitor accumulates and holds an offset voltage at the output terminal of the amplifier during the auto-zero operation interval, and cancels an offset voltage at the input terminal of the amplifier by an accumulated and held offset voltage during an amplification interval subsequent to the auto-zero operation interval. A second switching device grounds the feedback point of the feedback circuit during the auto-zero operation interval. A second capacitor blocks a DC voltage, and accumulates and holds an offset voltage at an output terminal of the amplifier, and cancels an offset voltage at an input terminal of the amplifier by the accumulated and held offset voltage during an amplification interval.
    • 在反馈放大器电路中,第一开关器件在放大间隔之前的自动归零操作间隔期间,通过将从放大器输出的信号输入到放大器的输入端子来执行自动归零操作。 第一电容器在自动归零操作间隔期间在放大器的输出端积累并保持偏移电压,并且在放大器的输出端之后的放大间隔期间通过累积和保持的偏移电压来消除放大器的输入端的偏移电压 自动归零运行间隔。 第二开关装置在自动归零操作间隔期间将反馈电路的反馈点接地。 第二电容器阻塞DC电压,并且在放大器的输出端累积并保持偏移电压,并且在放大间隔期间通过累积和保持的偏移电压来消除放大器输入端的偏移电压。
    • 9. 发明授权
    • Analog to digital converter circuit of successive approximation type operating at low voltage
    • 在低电压下工作的逐次逼近型模数转换器电路
    • US07015841B2
    • 2006-03-21
    • US11029492
    • 2005-01-06
    • Takeshi YoshidaAtsushi IwataMamoru SasakiMiho AkagiKunihiko Goto
    • Takeshi YoshidaAtsushi IwataMamoru SasakiMiho AkagiKunihiko Goto
    • H03M1/10
    • H03M1/1245H03M1/466H03M1/804
    • In a sampling and holding, a control logic circuit connects another end of each capacitor of a DA converter to a ground potential, and outputs a sampled input analog signal from a switched amplifier to one end of a hold capacitor to hold. In a successive approximation, it controls a switched amplifier to set an output terminal thereof to a high-impedance state and the hold capacitor to connect the one end thereof to the ground potential. Then, it switches over connection of another end of each capacitor from the ground potential to a power supply voltage based on a digital value held by a successive approximation register to output an output voltage from another end of the hold capacitor to a comparator, and compares the output voltage from another end thereof with an intermediate reference voltage to obtain a digital value from the successive approximation register.
    • 在采样和保持中,控制逻辑电路将DA转换器的每个电容器的另一端连接到地电位,并且将来自开关放大器的采样输入模拟信号输出到保持电容器的一端以保持。 在逐次逼近中,它控制开关放大器将其输出端子设置为高阻抗状态,并且保持电容器将其一端连接到地电位。 然后,基于由逐次逼近寄存器保持的数字值将每个电容器的另一端从地电位切换到电源电压,以将输出电压从保持电容器的另一端输出到比较器,并将其进行比较 来自其另一端的输出电压具有中间参考电压,以从逐次逼近寄存器获得数字值。