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A 160 dB Equivalent Dynamic Range Auto-Scaling Interface for Resistive Gas
一种用于电阻式气体传感器的160 dB等效动态范围自动缩放接口电路
0.35μm CMOS, 3.3V, 6mW
电阻式气体传感器动态范围自动缩放跨阻放大器A/D转换器
▸创新点1：多尺度跨阻连续时间放大器（方法创新） - 该设计采用多尺度跨阻放大器结构，通过动态调整增益范围实现宽动态范围信号处理，支持100Ω至20MΩ的电阻测量范围，解决了传统单一增益放大器无法覆盖宽范围传感器信号的问题。
▸创新点2：13位增量型A/D转换器（电路创新） - 采用高精度增量型ADC架构，结合噪声整形技术，在6mW低功耗下实现13位有效分辨率，显著提升了系统在宽动态范围内的量化精度。
▸创新点3：自动量程选择电路（系统创新） - 通过数字控制逻辑实时监测输入信号幅度，自动选择最优测量量程，无需人工干预即可保证各量程下测量误差低于0.1%，实现了160dB等效动态范围。
▸创新点4：集成双DAC校准系统（电路创新） - 内置偏移和增益校准DAC，针对每个量程单独进行误差补偿，将多量程间的匹配误差控制在0.05%以内，确保全量程测量一致性。
Abstract
In this paper an integrated wide-dynamic-range interface circuit for resistive gas-sensors arrays is presented. The proposed device consists of a multi-scale transresistance continuous time amplifier followed by a 13-bit incremental A/D converter. The circuit selects automatically the scale to use for each measurement and includes two digital-to-analog converters for the calibration of offset and gain of each scale. The proposed interface circuit achieves a measurement accuracy almost always better than 0.1% over a sensor resistance range of more than 5 decades [100 /10–20 M/10], leading to an equivalent dynamic range of about 160 dB. The chip has been realized with a 0.35 m CMOS technology and occupies an area of 3.1 mm /50consuming 6 mW from a 3.3 V power supply.