A 1.8 $\mu$W 60 nV$/\surd$Hz Capacitively-Coupled Chopper Instrumentation Amplifier in 65 nm CMOS for Wireless Sensor Nodes

Fan, Qinwen; Foti, Sebastiano; Huijsing, Johan H.; Makinwa, Kofi A. A.

doi:10.1109/jssc.2011.2143610

Cited by 374 publications

(208 citation statements)

References 22 publications

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“…The results demonstrate that the RRL and DSL effectively reject the ripples and low-frequency noise, respectively. The performance comparisons are given in Table 1 [4,5]. The differential gain and CMRR of the proposed IA are 71 dB and 89 dB, respectively, at 50 Hz.…”

Section: Resultsmentioning

confidence: 99%

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Analog front-end measuring biopotential signal with effective offset rejection loop

Lim

Kim

Song

et al. 2015

BME

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Abstract. This paper presents an analog front-end (AFE) IC design for recording biopotential signals. The AFE employs a capacitively coupled instrumentation amplifier to achieve a low-noise and high-common mode rejection ratio (CMRR) system. A ripple reduction loop is proposed to reduce the ripple generated by the up-modulating chopper. The low frequency noise is attenuated by an input AC coupling capacitor, and is attenuated again by a DC servo loop. The proposed AFE features a differential gain of 71 dB, and a CMRR of 89 dB, at 50 Hz. Furthermore, the proposed AFE can robustly acquire biopotential signals even in the presence of an input offset and ripples.

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Section: Resultsmentioning

confidence: 99%

“…Thus, an additional DSL is also designed to provide additional poles forthe overall transfer function of the CCIA, and form an additional highpass filter (HPF). As a result, the input offset and low-frequency artifacts are attenuated by a secondorder HPF (CCIA + DSL), in contrast to the first order attenuation used in previous studies [5].…”

Section: Introductionmentioning

confidence: 99%

Analog front-end measuring biopotential signal with effective offset rejection loop

Lim

Kim

Song

et al. 2015

BME

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“…A DC-coupled amplifier can be realized with many different architectures, e.g. current balancing amplifiers [43][44], current feedback amplifiers [45][46], three-opamp amplifiers [47], and capacitively coupled chopper amplifiers [35] [48]. In case DC measurement is not mandatory, a DC-coupled amplifier can be easily converted into an AC-coupled amplifier by adding a DC servo loop (DSL) (see section V.C).…”

Section: Dc-coupled Amplifiersmentioning

confidence: 99%

“…10). Although the DC servo loops can also be implemented with a voltage-to-current feedback [35][43] [48], however, this suffers from a performance tradeoff between electrode offset tolerance and power (see section V.C), which limits the offset tolerance to roughly 50mV.…”

Section: Dc-coupled Amplifiersmentioning

confidence: 99%

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Active Electrodes for Wearable EEG Acquisition: Review and Electronics Design Methodology

Mitra

Hoof

et al. 2017

IEEE Rev. Biomed. Eng.

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137

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Abstract-Active Electrodes (AE), i.e. electrodes with built-in readout circuitry, are increasingly being implemented in wearable healthcare and lifestyle applications due to AE's robustness to environmental interference. An AE locally amplifies and buffers µV-level EEG signals before driving any cabling. The low output impedance of an AE mitigates cable motion artifacts thus enabling the use of high-impedance dry electrodes for greater user comfort. However, developing a wearable EEG system, with medical grade signal quality on noise, electrode offset tolerance, common-mode rejection ratio (CMRR), input impedance and power dissipation, remains a challenging task. This paper reviews state-of-the-art bio-amplifier architectures and low-power analog circuits design techniques intended for wearable EEG acquisition, with a special focus on AE system interfaced with dry electrodes. Index Terms-Active electrode, instrumentation amplifier (IA), electroencephalography (EEG), dry electrodes, common-mode rejection ratio (CMRR), brain-computer interface (BCI)I. INTRODUCTION ecent advances in biomedical technologies, integrated circuits (ICs), sensors and data analysis techniques have accelerated the development of wearable technology for Telehealth applications. Today, miniature and low-power medical sensors can be easily integrated into various accessories that continuously sense, process and transfer people's physiological information during their daily life activities. By reducing the need for manual intervention and by lowering the cost, these medical devices are being widely used in personal healthcare and home diagnostics, such as wellness and health monitoring, home rehabilitation, and the early detection of brain disordersElectroencephalography (EEG)

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Precision Instrumentation Amplifiers

Huijsing

2014

Smart Sensor Systems

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A 1.8 $\mu$W 60 nV$/\surd$Hz Capacitively-Coupled Chopper Instrumentation Amplifier in 65 nm CMOS for Wireless Sensor Nodes

Cited by 374 publications

References 22 publications

Analog front-end measuring biopotential signal with effective offset rejection loop

Analog front-end measuring biopotential signal with effective offset rejection loop

Active Electrodes for Wearable EEG Acquisition: Review and Electronics Design Methodology

Precision Instrumentation Amplifiers

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