1.5位结构是构成pipelined ADC的基本单元,总结了2位向1.5位方案传函的演变过程,但对转换的最优性并未证明.在此通过理论分析揭示了ADC及其单级传输函数变换的本质,证明了在Pipeline结构中,ADC单级传输函数演变的本质是:通过单级传函的变化,使整个ADC最终的传输函数与我们所习惯使用的(或者说最初使用的),相差不大于1个LSB,同时在参考电压失调,子DAC输出失调或者增益错误方面获得一定的鲁棒性.%The 1. 5-bit structure is the basic unit of a pipelined ADC. The evolution process of the program from 2-bit to 1. 5-bit are summarized in Reference [1],but the optimality of conversion does not be proved. In this paper, theoretical analysis reveals the nature of ADC and its evolution process of the single-stage transfer function in the pipeline structure. The nature of evolution process of the single-stage transfer function is; the change of single-stage transfer function makes the diffe-rece to be no more than 1 LSB between the ADC transfer function and that the engineers are accustomed to using (or initial use). While gaining a certain robustness for the reference voltage offset. Sub-DAC output offset or gain errors.
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