一种高精确度低功耗Delta-Sigma调制器

摘要

A-Delta-Sigma-modulator,-featured-with-high-precision-and-low-power-consumption,-is-designed-for-the-process-control-in-industry,-portable-measuring-instrument,-etc.-The-modulator,-combining-Cascaded-Integrators-distributed-Feed-Back(CIFB)-structure-with-Chopper-Stabilization-technique,-being-realized-with-2nd-single-bit-architecture,-can-reduce-the-1/f-noise-and-dc-offset-effectively.-The-chip-is-implemented-by-MIXIC’s-0.35μm-CMOS-technology.-The-post-simulation-of-the-modulator-indicates-that-105-dB-Signal-to-Noise-and-Distortion-Ratio(SNDR)-has-been-achieved-within-bandwidth-of-30-Hz.-The-power-consumption-of-the-modulator-is-only-1.3-mW-at-supply-voltage-of-3.3-V.-The-modulator-can-meet-the-measurement-requirements-of-low-frequency-weak-signal.%提出了一种应用于工业过程控制、便携式测量仪器等领域的高精确度低功耗 Delta-Sigma 调制器。该调制器采用积分器级联反馈(CIFB)二阶单环一位结构实现，并利用斩波稳零技术，有效地减小了调制器的1/f噪声和直流失调。调制器采用旺宏0.35μm CMOS工艺实现。仿真结果表明，在30 Hz 的信号带宽内，调制器的信噪失真比(SNDR)可以达到105 dB，在3.3 V 的工作电压下，功耗仅1.3 mW，满足对低频微弱信号的检测要求。