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    • 3. 发明申请
    • ANALOGUE TO DIGITAL CONVERTER
    • 数字转换器的模拟
    • WO1991015899A1
    • 1991-10-17
    • PCT/GB1991000508
    • 1991-04-02
    • CAMBRIDGE CONSULTANTS LIMITEDDAVIES, ChristopherCOLLIER, James, Digby, Yarlet
    • CAMBRIDGE CONSULTANTS LIMITED
    • H03M01/14
    • H03M1/0682H03M1/146
    • An analogue to digital converter comprising a first analogue to digital conversion stage (14) for performing a relatively coarse conversion on a sample of an analogue input signal; a sample and hold stage (13) for holding the sample of the analogue signal fed to the first conversion stage while it is converted by the first conversion stage; a digital to analogue conversion stage (15) to which the digital output from the first conversion stage is fed; a difference circuit (16) for generating an analogue difference signal representing the difference between the signal held by the sample and hold stage (13) and the output from the digital to analogue conversion stage (15); a second analogue to digital conversion stage (17) for generating a digital output corresponding to the difference signal; and a combining unit (18) for combining the digital outputs of the first and second conversion stages to generate a digital output representing the sampled analogue input signal. The sample and hold stage (13) and the first and second analogue to digital conversion stages (14, 17) each responds to a respective pair of differential input signals. The sample and hold (13) and digital to analogue conversion stages (15) each generate output signals in the form of differential pairs of currents. The difference circuit (16) arithmetically combines appropriate pairs of the currents from the sample and hold and digital to analogue conversion stages to generate a differential current pair for input to the second analogue to digital conversion stage.
    • 一种模数转换器,包括用于对模拟输入信号的采样进行相对粗略的转换的第一模数转换级(14) 一个采样和保持级(13),用于在通过第一转换级转换时保持馈送到第一转换级的模拟信号的采样; 数字到模拟转换级(15),其中馈送来自第一转换级的数字输出; 差分电路(16),用于产生表示由采样和保持级(13)保持的信号与数模转换级(15)的输出之间的差的模拟差分信号; 第二模数转换级(17),用于产生对应于差分信号的数字输出; 以及组合单元(18),用于组合第一和第二转换级的数字输出,以产生表示采样的模拟输入信号的数字输出。 采样和保持级(13)以及第一和第二模数转换级(14,17)各自响应于相应的差分输入信号对。 采样和保持(13)和数模转换级(15)各自产生差分电流对的形式的输出信号。 差分电路(16)将来自采样和保持电路和数模转换级的合适的电流对电路组合,以产生用于输入到第二模数转换级的差分电流对。