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    • 17. 发明授权
    • Two-step parallel analog to digital converter
    • 两级并行模数转换器
    • US4875048A
    • 1989-10-17
    • US237757
    • 1988-08-29
    • Toshihiko ShimizuMasao HottaKenji Maio
    • Toshihiko ShimizuMasao HottaKenji Maio
    • H03M1/14H03M1/00H03M1/10
    • H03M1/10H03M1/16H03M1/361
    • In a two-step parallel analog to digital converter of the type in which a first flash-type A/D converter determines the upper significant bits of a digital signal output having a desired number of bits and after a quantizing error of the first flash-type A/D converter has been determined from the difference between a value obtained by reconverting the upper significant bits to an analog value and the input analog value a second flash-type A/D converter subjects the quantizing error to A/D conversion to determine a digital output of the remaining lower significant bits, a gain correcting circuit is additionally provided to automatically establish a gain of a D/A converter for reconverting the upper significant bits to an analog value on the basis of a reference voltage applied to the first flash-type A/D converter. Moreover, a reference voltage generating circuit is additionally provided to establish upper and lower reference voltages of a second flash-type A/D converter for determining lower significant bits on the basis of the step voltage of the DAC output.
    • 在两级并行模数转换器中,其中第一闪存型A / D转换器确定具有所需位数的数字信号输出的高有效位,并且在第一闪存型A / D转换器的量化误差之后, 已经根据通过将高有效位重新转换为模拟值而获得的值与输入模拟值之间的差确定了A / D转换器,第二闪存型A / D转换器将量化误差对A / D转换进行测量,以确定 附加提供增益校正电路以自动建立D / A转换器的增益,用于根据施加到第一闪存的参考电压将高有效位重新转换为模拟值 型A / D转换器。 此外,另外提供参考电压产生电路以建立第二闪存型A / D转换器的上限和下限参考电压,用于基于DAC输出的阶跃电压来确定较低有效位。