A 1-V 1.1-μW sensor interface IC for wearable biomedical devices

Zou, Xiaodan; Xu, Xiaoyuan; Tan, Jun; Yao, Libin; Lian, Yong

doi:10.1109/iscas.2008.4542020

Cited by 13 publications

(3 citation statements)

References 5 publications

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“…[1][2][3][4][5][6] The NiO/ZnO solar cells only absorb the ultraviolet (UV) light and transmit visible light. Therefore, they can be used in various ways; for instance, in greenhouse panels, in UV blocking windows and in designed surface, and to supply power to low power consumption devices developed in recent years, such as temperature 7,8) and medical 9,10) sensors. With the combination of a visible-light-transparent solar cell and a transparent device, monolithic self-powered "invisible Internet of Things devices" will be feasible.…”

mentioning

confidence: 99%

Proton irradiation effects on NiO/ZnO visible-light-transparent solar cells for space applications

Kato¹,

Sugiyama²

2021

Jpn. J. Appl. Phys.

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In this study, the feasibility of in-space applications of a NiO/ZnO visible-light-transparent solar cell was investigated. The current density–voltage and external quantum efficiency measurements were conducted under air mass (AM) 0 conditions, and a short-circuit current density under AM 0 increased 2.6 times compared to that under AM 1.5. This significant increase is attributed to the absorption of only ultraviolet light with a wavelength of less than 400 nm, the irradiance of which is especially large in AM 0. Moreover, the degradation of photovoltaic properties of NiO/ZnO solar cells after 380 keV proton irradiation was evaluated to determine the possibility of long-term operation in space. No significant degradation was observed at a proton fluence of less than 3 × 1014 cm−2– 1 × 1015 cm−2. The NiO/ZnO solar cells showed the potential of a higher radiation tolerance under proton irradiation, as compared to Cu(In,Ga)Se2 (CIGS) or GaAs-based solar cells.

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mentioning

confidence: 99%

Proton irradiation effects on NiO/ZnO visible-light-transparent solar cells for space applications

Kato¹,

Sugiyama²

2021

Jpn. J. Appl. Phys.

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“…The solar cells could generate sufficient power to drive the flexible IoT devices even at extremely small values (such as 24 μW cm −2 ) of the maximum power density (P max ) prior to bending. [24][25][26][27] The adhesion of the solar cells was sufficient to prevent it from peeling off or to avoid mechanical failure. Compared with the initial properties, the normalized open-circuit voltage (V oc ) of the flexible NiO/ZnO solar cells decreased to 0.27 after 90 bending cycles.…”

Section: Resultsmentioning

confidence: 99%

Electrical degradation and recovery of NiO/ZnO visible-light-transparent flexible solar cells

Kim¹,

Kato²,

Chichibu³

et al. 2021

Jpn. J. Appl. Phys.

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Fundamental photovoltaic parameters such as current density–voltage characteristics of flexible NiO/ZnO solar cells were investigated; the study revealed the degradation and recovery properties of the cells. The open-circuit voltage and shunt resistance of the flexible NiO/ZnO solar cells tended to decrease subsequent to bending; however, the short-circuit current and series resistance remained constant. This indicated that the number of defects caused by bending tend to increase proximate to the NiO/ZnO interface as compared to that of the bulk of the flexible solar cell. Moreover, the decreased solar cell performance caused by bending improved through heat treatment at 150 °C for 15 min. The results obtained could serve as the first step towards the realization of flexible visible-light-transparent solar cells using polycrystalline films.

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“…Unobtrusive, user-friendly, and long-term usable fully integrated wearable systems enable healthcare devices to monitor the human body condition continuously and to give feedback to users (Dias and Paulo Silva Cunha, 2018). The advances of application-specific integrated circuit (ASIC) technology reduce the size of electrical devices, thereby increasing the availability of small-size devices in everyday life (Yin and Ghovanloo, 2007;Zou et al, 2008). In addition, recent substantial developments in computation algorithms and wide-bandwidth wireless communication technologies foster the everyday use of wearable devices (Aun et al, 2017;Beniczky et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Motion Artifact Removal Techniques for Wearable EEG and PPG Sensor Systems

et al. 2021

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Removal of motion artifacts is a critical challenge, especially in wearable electroencephalography (EEG) and photoplethysmography (PPG) devices that are exposed to daily movements. Recently, the significance of motion artifact removal techniques has increased since EEG-based brain–computer interfaces (BCI) and daily healthcare usage of wearable PPG devices were spotlighted. In this article, the development on EEG and PPG sensor systems is introduced. Then, understanding of motion artifact and its reduction methods implemented by hardware and/or software fashions are reviewed. Various electrode types, analog readout circuits, and signal processing techniques are studied for EEG motion artifact removal. In addition, recent in-ear EEG techniques with motion artifact reduction are also introduced. Furthermore, techniques compensating independent/dependent motion artifacts are presented for PPG.

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A 1-V 1.1-μW sensor interface IC for wearable biomedical devices

Cited by 13 publications

References 5 publications

Proton irradiation effects on NiO/ZnO visible-light-transparent solar cells for space applications

Proton irradiation effects on NiO/ZnO visible-light-transparent solar cells for space applications

Electrical degradation and recovery of NiO/ZnO visible-light-transparent flexible solar cells

Motion Artifact Removal Techniques for Wearable EEG and PPG Sensor Systems

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