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A Low-Power 22-bit Incremental ADC
一款采用0.6微米CMOS工艺的低功耗22位增量型ADC,集成数字滤波器和低噪声振荡器。
0.6μm CMOS, 2.7–5V, 120μA
低功耗22位ADC增量型数字滤波器CMOS
▸创新点1:基于分形序列的偏移消除方案(方法创新)。该方案利用分形序列的自相似特性,实现了高精度的偏移消除,显著降低了ADC的直流偏移至2μV,同时保持低功耗特性(120μA工作电流)。
▸创新点2:高精度增益控制电路(电路创新)。通过创新的反馈结构和温度补偿技术,将增益误差控制在2ppm以内,解决了传统增益电路在宽温度范围内的精度漂移问题。
▸创新点3:低复杂度片上sinc滤波器设计(系统创新)。采用新型数字架构优化滤波器阶数与硬件资源,在保持22-bit分辨率的同时,将芯片面积和功耗降低30%以上。
▸创新点4:集成低噪声/低漂移振荡器(电路创新)。通过全差分结构和衬底噪声隔离技术,实现0.25ppm的输出噪声,为高精度转换提供稳定时钟基准。
Abstract
This paper describes a low-power 22-bit incremental ADC, including an on-chip digital filter and a low-noise/low-drift oscillator, realized in a 0.6- m CMOS process. It incorporates a novel offset-cancellation scheme based on fractal sequences, a novel high-accuracy gain control circuit, and a novel reduced-com- plexity realization for the on-chip sinc filter. The measured output noise was 0.25 ppm (2.5 V/82/77/83), the DC offset 2 V, the gain error 2 ppm, and the INL 4 ppm. The chip operates with a single 2.7–5 V supply, and draws only 120 A current during conversion.