公开(公告)号：US09559716B1

公开(公告)日：2017-01-31

申请号：US15197447

申请日：2016-06-29

Applicant: Renesas Electronics Corporation

Inventor： Tetsuo Matsui ,  Hiroto Suzuki ,  Masaki Fujiwara ,  Tetsuro Matsuno

IPC: H03M1/06 ,  H03M1/46 ,  H03M1/12

CPC classification number: H03M1/46 ,  H03M1/069 ,  H03M1/1061 ,  H03M1/124 ,  H03M1/468

Abstract: A processing speed can be improved while the accuracy of AD conversion is enhanced. An AD converter includes: a higher-order DAC that samples an analog input signal and performs DA conversion corresponding to higher-order bits of a digital output signal; an extension DAC that performs DA conversion to positive and negative polarities on an extension bit for expanding bits of the higher-order DAC; a lower-order DAC that performs DA conversion corresponding to lower-order bits of the digital output signal; a comparator that compares a comparison reference voltage with output voltages of the higher-order DAC, the extension DAC, and the lower-order DAC; and a successive approximation logic that controls successive approximation performed by the higher-order DAC, the extension DAC, and the lower-order DAC based on a comparison result of the comparator and generates the digital output signal.

Abstract translation: 可以提高处理速度，同时提高AD转换的精度。 AD转换器包括：高阶DAC，其对模拟输入信号进行采样，并对数字输出信号的高位进行DA转换; 扩展DAC，用于在用于扩展高阶DAC的位的扩展位上执行DA转换为正极性和负极性; 执行对应于数字输出信号的低阶位的DA转换的低阶DAC; 将比较参考电压与高阶DAC，扩展DAC和低阶DAC的输出电压进行比较的比较器; 以及基于比较器的比较结果控制由高阶DAC，扩展DAC和低阶DAC执行的逐次逼近的逐次逼近逻辑，并产生数字输出信号。