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ISFET-Based Sensor Signal Processor Chip Design for Environment Monitoring Applications

机译:基于ISFET的传感器信号处理器芯片设计,用于环境监测应用

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In recent years Ion-Sensitive Field Effect Transistor (ISFET) based transducers create valuable applications in physiological data acquisition and environment monitoring. This paper presents a mixed-mode ASIC design for potentiometric ISFET-based bio-chemical sensor applications including H~+ sensing and hand-held pH meter. For battery power consideration, the proposed system consists of low voltage (3V) analog front-end readout circuits and digital processor has been developed and fabricated in a 0.5μm double-poly double-metal CMOS technology To assure that the correct pH value can be measured, the two-point calibration circuitry based on the response of standard pH4 and pH7 buffer solution has been implemented by using algorithmic state machine hardware algorithms. The measurement accuracy of the chip is 10 bits and the measured range between pH 2 to pH 12 compared to ideal values is within the accuracy of 0.1pH. For homeland environmental applications, the system provide rapid, easy to use, and cost-effective on-site testing on the quality of water, such as drinking water, ground water and river water. The processor has a potential usage in battery-operated and portable devices in environmental monitoring applications compared to commercial hand-held pH meter.
机译:近年来,基于离子敏感场效应晶体管(ISFET)的换能器在生理数据采集和环境监测中创造了有价值的应用。本文提出了一种用于基于ISFET的电位化学生化传感器应用的混合模式ASIC设计,包括H〜+感应和手持式pH计。考虑到电池电量,建议的系统由低压(3V)模拟前端读出电路组成,数字处理器已开发并采用0.5μm的双多晶硅双金属CMOS技术制造,以确保可以正确的pH值。测量时,已经通过使用算法状态机硬件算法实现了基于标准pH4和pH7缓冲溶液响应的两点校准电路。芯片的测量精度为10位,与理想值相比,pH 2至pH 12的测量范围在0.1pH的精度范围内。对于国土环境应用,该系统可对饮用水(如饮用水,地下水和河水)的水质进行快速,易用且经济高效的现场测试。与商用手持式pH计相比,该处理器在环境监测应用中的电池供电和便携式设备中具有潜在的用途。

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