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6.5µW 92.3DB-DR Biopotential-Recording Front-End with 360MV<inf>PP</inf> Linear Input Range
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2018
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EngineeringQuantization Noise LevelData ConverterMixed-signal Integrated CircuitBioelectronicsAnalog DesignLinear Input RangeBiomedical EngineeringDirect-digital-conversion Biopotentialrecording Front-endDigital Circuit DesignBioinstrumentationAnalog-to-digital ConverterDynamic Range
This paper presents a direct-digital-conversion biopotentialrecording front-end with 92.3dB dynamic range at an input range of 360m V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">pp</sub> . The proposed front-end is a capacitively -coupled 3rd-order Gm-C CT ΔΣM with a 5-bit SAR quantizer. The capacitively-coupled summing circuit increases linearity of the ΔΣM, and a 3rd-order Gm-C loop filter and a 5-bit SAR ADC reduces quantization noise level. The proposed front-end is fabricated in 0.18μm CMOS, and achieves 91.3dB SNDR and 1.8μ V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">rms</sub> input-referred noise over 100Hz BW. Also, an invitro LFP recording is performed to verify the front-end.