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A −64.3 dB THD, 26 nV/√ Hz Bio-Potential Readout Analog-Front-End Amplifier With a Gm-C Integrator-Implanted DC Servo Loop, and a Bulk-Driven Ripple Reduction Loop

This paper presents a G_{m} -C integrator-implanted DC servo loop (GMCI2-DSL) and a bulk-driven ripple reduction loop (BD-RRL) for bio-potential readout analog-front-end (AFE) amplifier. The proposed bio-potential readout AFE amplifier employs the GMCI2-DSL and BD-RRL to achieve low noise and signi...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. I, Regular papers Regular papers, 2024-02, Vol.71 (2), p.537-547
Main Authors: Wen, Kui, Liu, Shubin, Zhong, Longjie, Shen, Yuke, Zhu, Zhangming
Format: Article
Language:English
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Summary:This paper presents a G_{m} -C integrator-implanted DC servo loop (GMCI2-DSL) and a bulk-driven ripple reduction loop (BD-RRL) for bio-potential readout analog-front-end (AFE) amplifier. The proposed bio-potential readout AFE amplifier employs the GMCI2-DSL and BD-RRL to achieve low noise and significant total harmonic distortion (THD) with small ripple amplitude. A prototype has been taped out using a 0.18- \mu \text{m} standard CMOS technology, and the core circuit occupies 880 \mu \text{m}\,\,\times 630 \mu \text{m} . The mid-band gain is about 40 dB with a 1.3-V supply voltage, and the chip's quiescent power is 10.8 \mu \text{W} . The measured results show that the input-referred noise density is 26 nV/ \surd Hz, and the input-referred integrated noise in the range from 0.5 Hz to 500 Hz is 0.93 \mu V_{rms} . The measured THD of a 5- \text{m}V_{pp} input sinusoidal signal at 5.1 Hz is −64.3 dB without any input offset. The amplitude of residue ripple is achieved as 197.8 \mu \text{V} around chopping frequency ( f_{ch} ) by ripple suppression. High-fidelity and real-time electrocardiogram (ECG) signals are acquired.
ISSN:1549-8328
1558-0806
DOI:10.1109/TCSI.2023.3329805