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    • 10. 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。