Highly sensitive biomedical amplifier with CMRR calibration and DC-offset compensation

Galjan, Wjatscheslaw; Hafkemeyer, Kristian M.; Tomasik, Jakob M.; Wagner, Fabian; Krautschneider, Wolfgang H.; Schroeder, Dietmar

doi:10.1109/eurcon.2009.5167621

Cited by 4 publications

(4 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A voltage known as the half-cell potential develops across the skin and electrode interface appearing as a DC offset in the bio-potential sensing system. This offset voltage can be up to ±300 mV and may saturate the preamplifier [12,13], thus limiting the maximum gain of the amplifier unless DC offset rejection circuitry is implemented in the system's AFE.…”

Section: A Bio-potential Afementioning

confidence: 99%

See 1 more Smart Citation

Multimodal Analog Front End for Wearable Bio-Sensors

et al. 2016

View full text Add to dashboard Cite

Wearable sensors afford convenience in daily health monitoring, though many challenges in the development of such systems need to be overcome. Here, we present a low power, multimodal analog front-end (AFE) for wearable health monitoring sensors based on novel system architecture and VLSI circuit design methods. The AFE integrated circuit was designed with standard 65 nm CMOS technology. Three sensor AFEs, bio-potential, photoplethysmography (PPG) and bioelectrical impedance analyzer (BIA), were integrated on the same die with an area of 2.5 × 2.5 mm 2 . The power consumption for each AFE mode was less than 0.4 mW and did not exceed 2 mW for all three modes with a 1.2V power supply. Results from each individual AFE showed high-quality, motion-robust signals (Electrocardiogram, PPG and BIA) that correlated with those obtained from clinical grade gold-standard devices for similar applications. Such multi-functional, non-intrusive systems permit users to effortlessly self-monitor multiple clinically-relevant physiological parameters.

show abstract

Section: A Bio-potential Afementioning

confidence: 99%

“…Alternatively, active AC-coupling approaches have been introduced [12,13], which use AC-coupled capacitive feedback with fast-recovery circuits to reset the proper DC levels after input overload. However, these designs typically use referential-mode amplifier which measures signals with respect to a common reference.…”

Section: A Bio-potential Afementioning

confidence: 99%

Multimodal Analog Front End for Wearable Bio-Sensors

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Alternatively, active AC-coupling approaches have been introduced [5, 6], which use AC-coupled capacitive feedback with fast-recovery circuits to reset the proper DC levels after input overload. However, these designs typically use single-ended amplifier and measures signal with respect to common reference.…”

Section: Challenges In Bio-sensing From Wristmentioning

confidence: 99%

Challenges in wearable personal health monitoring systems

Kim

Lai

Lobo

et al. 2014

2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

View full text Add to dashboard Cite

Wearable sensors give the users convenience in daily health monitoring, though several challenges in such sensor systems should be overcome. This paper discusses the challenges in wearable health monitoring sensors and solutions for multi-modal and multi-functional wrist-worn devices based on novel circuit design techniques to reject DC offset. Furthermore, this paper also presents a novel sophisticated algorithm to reject motion artifacts. The system has the capability to simultaneously acquire several bio-signals (i.e. electrocardiogram, PPG, and body-electrode impedance). The system can also help patients who want to monitor their psychological signals to mitigate health risks.

show abstract

“…The decrease in SNR makes it quite difficult to acquire the CM using the bio-potential amplifiers available in the market [8]. Even the very sensitive bio-potential amplifiers presented in [9] and [10] do not have adequate Common Mode Rejection Ratio (CMRR) above 200-300 Hz to acquire a signal of magnitude 0.1 V. The Common Mode signal can be as large as 50 mV, so the bio-potential amplifier requires at least 113 dB of CMRR to acquire a signal of magnitude 0.1 V.…”

Section: Introductionmentioning

confidence: 99%