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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的接口电路

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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:本文介绍了使用Delta-Sigma调制的生物医学应用的新ISFET接口电路。所提出的设计在线区域中操作ISFET,使得输出电流在宽范围(pH2至pH14)上线性取决于pH值。使用Sigma-Delta转换器进行转换为数字输出域,使接口电路非常坚固可靠,对于大多数传感器应用。所提出的电路采用0.18μm的技术设计。电源电压为1.8 V,总电流绘制为56μA。仿真结果表明,所提出的电路可以感测误差范围内的pH值-0.2%至0.3%的误差范围为2至14。

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