A Current-Feedback Instrumentation Amplifier with 5μV Offset for Bidirectional High-Side Current-Sensing

Witte, J.F.; Huijsing, Johan H.; Makinwa, Kofi A. A.

doi:10.1109/isscc.2008.4523063

Cited by 41 publications

(33 citation statements)

References 5 publications

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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%

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

Mitra

Hoof

et al. 2017

IEEE Rev. Biomed. Eng.

138

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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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Section: Dc-coupled Amplifiersmentioning

confidence: 99%

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

Mitra

Hoof

et al. 2017

IEEE Rev. Biomed. Eng.

138

View full text Add to dashboard Cite

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“…is the current transfer gain from node to node [34]. Further, = 1 − and = 1 − , where and denote the current and voltage tracking errors of the DVCC.…”

Section: Nonideal Analysis Of Instrumentation Amplifiermentioning

confidence: 99%

Carbon Nanotubes-Based Digitally Programmable Current Follower

2018

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The physical constraints of ever-shrinking CMOS transistors are rapidly approaching atomistic and quantum mechanical limits. Therefore, research is now directed towards the development of nanoscale devices that could work efficiently in the sub-10 nm regime. This coupled with the fact that recent design trend for analog signal processing applications is moving towards currentmode circuits which offer lower voltage swings, higher bandwidth, and better signal linearity is the motivation for this work. A digitally controlled DVCC has been realized using CNFETs. This work exploited the CNFET's parameters like chirality, pitch, and numbers of CNTs to perform the digital control operation. The circuit has minimum number of transistors and can control the output current digitally. A similar CMOS circuit with 32 nm CMOS parameters was also simulated and compared. The result shows that CMOS-based circuit requires 418.6 W while CNFET-based circuit consumes 352.1 W only. Further, the proposed circuit is used to realize a CNFET-based instrumentation amplifier with digitally programmable gain. The amplifier has a CMRR of 100 dB and ICMR equal to 0.806 V. The 3 dB bandwidth of the amplifier is 11.78 GHz which is suitable for the applications like navigation, radar instrumentation, and high-frequency signal amplification and conditioning.

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“…In 2008, a chopper-stabilized current feedback instrumentation amplifier (CFIA) for high-side current sensing was published by Witte [2]. A simplified block diagram of this amplifier is shown in Fig.…”

Section: Hv Chopper-stabilized Current Feedback Instrumentation Amplimentioning

confidence: 99%

Capacitively Coupled Chopper Instrumentation Amplifiers for High-Side Current Sensing

Fan

Makinwa

Huijsing³

2016

Capacitively-Coupled Chopper Amplifiers

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A Current-Feedback Instrumentation Amplifier with 5μV Offset for Bidirectional High-Side Current-Sensing

Cited by 41 publications

References 5 publications

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

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

Carbon Nanotubes-Based Digitally Programmable Current Follower

Capacitively Coupled Chopper Instrumentation Amplifiers for High-Side Current Sensing

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