高精度Sigma-Delta ADC芯片设计研究  

Design and Research of High Precision Sigma Delta ADC

作　　者：刘庆一 孙艳杰 孙文海 刘瑞华 赵义强 Liu Qingyi;Sun Yanjie;Sun Wenhai;Liu Ruihua;Zhao Yiqiang

机构地区：[1]大唐半导体科技有限公司,山东省青岛市266100 [2]齐鲁工业大学(山东省科学院)山东省科学院自动化研究所,山东省济南市250014

出　　处：《时代汽车》2022年第16期105-108,共4页Auto Time

基　　金：山东省重点研发计划(2022CXGC010107)。

摘　　要：Sigma-Delta ADC利用过采样技术和噪声整形技术提升转换精度,高转换精度需要高过采样率,严重限制了电路的转换速度,本文针对高速高精度模数转换需求,提出基于高阶调制器结构、多比特量化和双采样技术的ADC结构,降低高精度转换所需的过采样率需求,提高电路的转换速度;结合带有前馈支路的单环调制器结构和多比特量化方式,大力缩减积分器输出摆幅,降低放大器设计难度和功耗,解决多级级联结构的稳定性差问题。Sigma delta ADC uses oversampling technology and noise shaping technology to improve the conversion accuracy.High conversion accuracy requires high oversampling rate,which seriously limits the conversion speed of the circuit.Aiming at the demand of high-speed and high-precision analog-to-digital conversion,this paper proposes an ADC structure based on high-order modulator structure,multi bit quantization and double sampling technology to reduce the demand of oversampling rate for high-precision conversion and improve the conversion speed of the circuit;Combined with the single loop modulator structure with feedforward branch and multi bit quantization mode,the output swing of integrator is greatly reduced,the design diffi culty and power consumption of amplifi er are reduced,and the problem of poor stability of multistage cascade structure is solved.

关 键 词：高精度模数转换器 SIGMA-DELTA 调制器 5-bit SAR量化器 

分 类 号：TN7[电子电信—电路与系统]