This paper presents an ultra-low-power, wide-dynamic-range interface circuit for capacitive and resistive sensors. The circuit is implemented as a switched-capacitor circuit using programmable capacitors to achieve high configurability. The circuit was fabricated using a CMOS 0.18 $\mu \text{m}$ process. Different types of capacitive and resistive sensors were measured using the interface to demonstrate its support for multi-sensor systems with an ultra-low-power budget. Experimental results show that the circuit is able to interface various sensors within the overall capacitance range of 0.6–550 pF and resistance range of 3.7–5100 $\text{k}\Omega $ , while consuming only 0.39–3.56 $\mu \text{W}$ from a 1.2 V supply. A proximity, gesture, and touch-sensing system is also developed consisting of the designed interface circuit and a sensor element that is able to detect the displacement of an object up to 15 cm from the sensing electrodes consuming only 0.83 $\mu \text{W}$ from a 1.2 V supply.

中文翻译：

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0.39–3.56μW 宽动态范围通用多传感器接口电路

本文介绍了一种用于电容式和电阻式传感器的超低功耗、宽动态范围接口电路。该电路作为开关电容器电路实现，使用可编程电容器来实现高可配置性。该电路是使用 CMOS 0.18 $\mu \text{m}$ 过程。使用该接口测量了不同类型的电容和电阻传感器，以展示其对具有超低功耗预算的多传感器系统的支持。实验结果表明，该电路能够在 0.6-550 pF 的总电容范围和 3.7-5100 的电阻范围内连接各种传感器 $\text{k}\Omega $ ，而仅消耗 0.39–3.56 $\mu \text{W}$ 来自 1.2 V 电源。还开发了接近、手势和触摸传感系统，由设计的接口电路和传感器元件组成，该传感器元件能够检测距离传感电极 15 cm 以内的物体的位移，仅消耗 0.83 $\mu \text{W}$ 来自 1.2 V 电源。