题目/Title：Design of a Low Noise Bio-Potential Recorder With High Tolerance to Power-Line Interference Under 0.8 V Power Supply

作者/Author：
                        Deng Luo,Jiaxin Lei,Milin Zhang,Zhihua Wang

期刊/Journal：IEEE Transactions on Biomedical Circuits and Systems

年份/Issue Date：2020Nov.

卷（期）及页码/Volume（No.）&pages：Vol.14, No.6, pp.1421-1430

摘要/Abstract：
A bio-potential recorder working under 0.8 V supply voltage with a tunable low-pass filter is proposed in this paper. The prototype is implemented in TSMC 180 nm CMOS technology, featuring a power consumption of 2.27 μW, while preserving a high tolerance of power-line interference (PLI) up to 600 mV pp , a common-mode rejection ratio (CMRR) of higher than 100 dB, a THD of -65.5 dB, and a noise density of 50 nV/√Hz by employing four new techniques, including 1) low noise chopper modulator, 2) feedback loop based common-mode cancellation loop (CMCL), 3) offset cancellation loop (OCL) with PMOS backgate control scheme, and 4) a very-lower transconductance (VLT) operational transconductance amplifier (OTA) using in the DC-servo-loop (DSL). The measured mid-band gain is 43.3 dB with a high-pass cut-off frequency of 1.2 Hz. The low-pass cut-off frequency can be configured from 650 Hz to 7.5 kHz. The measured input-referred integrated noise is 1.2 uVrms in the frequency band of 1-650 Hz and 4.1 uVrms in the 1 Hz-7.5 kHz frequency band, respectively, leading to a power efficiency factor (PEF) of 7.49 and 7.59.