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ISFET’s Interface Circuit for Biomedical Applications Using Delta-Sigma Modulation

机译:ISFET使用Delta-Sigma调制的生物医学应用接口电路

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This paper presents a new ISFET's interface circuit for biomedical applications using delta-sigma modulation. The proposed design operates ISFET in the linear region so that an output current is linearly dependent on pH over a wide range (pH 2 to pH 14). Conversion to a digital output domain is done using a sigma-delta converter making the interface circuit very robust and reliable for most sensor applications. The proposed circuit is designed in a 0.18 μm technology. The supply voltage is 1.8 V and the total current drawn is 56 μA. The simulation results show that the proposed circuit can sense a pH with an error within the range of -0.2% to 0.3% for pH ranging from 2 to 14.
机译:本文介绍了一种新的ISFET接口电路,该接口用于使用delta-sigma调制的生物医学应用。所提出的设计在线性区域中操作ISFET,从而使输出电流在较大范围(pH 2至pH 14)内线性依赖于pH值。使用sigma-delta转换器可完成向数字输出域的转换,从而使接口电路对于大多数传感器应用而言非常坚固且可靠。拟议的电路采用0.18μm技术设计。电源电压为1.8 V,汲取的总电流为56μA。仿真结果表明,对于2至14的pH值,提出的电路可以检测到pH值,其误差在-0.2%至0.3%的范围内。

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