Pub Date : 2018-10-01DOI: 10.1109/BIOCAS.2018.8584708
Dorian Haci, Yan Liu, S. Ghoreishizadeh, T. Constandinou
Implantable neural interfaces have evolved in the past decades from stimulation-only devices to closed-loop recording and stimulation systems, allowing both for more targeted therapeutic techniques and more advanced prosthetic implants. Emerging applications require multi-module active implantable devices with intrabody power and data transmission. This distributed approach poses a new set of challenges related to inter-module connectivity, functional reliability and patient safety. This paper addresses the ground referencing challenge in active multi-implant systems, with a particular focus on neural recording devices. Three different grounding schemes (passive, drive, and sense) are presented and evaluated in terms of both recording reliability and patient safety. Considerations on the practical implementation of body potential referencing circuitry are finally discussed, with a detailed analysis of their impact on the recording performance.
{"title":"Design Considerations for Ground Referencing in Multi - Module Neural Implants","authors":"Dorian Haci, Yan Liu, S. Ghoreishizadeh, T. Constandinou","doi":"10.1109/BIOCAS.2018.8584708","DOIUrl":"https://doi.org/10.1109/BIOCAS.2018.8584708","url":null,"abstract":"Implantable neural interfaces have evolved in the past decades from stimulation-only devices to closed-loop recording and stimulation systems, allowing both for more targeted therapeutic techniques and more advanced prosthetic implants. Emerging applications require multi-module active implantable devices with intrabody power and data transmission. This distributed approach poses a new set of challenges related to inter-module connectivity, functional reliability and patient safety. This paper addresses the ground referencing challenge in active multi-implant systems, with a particular focus on neural recording devices. Three different grounding schemes (passive, drive, and sense) are presented and evaluated in terms of both recording reliability and patient safety. Considerations on the practical implementation of body potential referencing circuitry are finally discussed, with a detailed analysis of their impact on the recording performance.","PeriodicalId":259162,"journal":{"name":"2018 IEEE Biomedical Circuits and Systems Conference (BioCAS)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114988008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.1109/BIOCAS.2018.8584830
Xiaying Wang, M. Magno, L. Cavigelli, M. Mahmud, C. Cecchetto, S. Vassanelli, L. Benini
This paper focuses on ultra-low power embedded classification of neural activities. The machine learning (ML) algorithm has been trained using evoked local field potentials (LFPs) recorded with an implanted 16×16 multi-electrode array (MEA) from the rat barrel cortex while stimulating the whisker. Experimental results demonstrate that ML can be successfully applied to noisy single-trial LFPs. We achieved up to 95.8% test accuracy in predicting the whisker deflection. The trained ML model is successfully implemented on a low-power embedded system with an average consumption of 2.6 mW.
{"title":"Embedded Classification of Local Field Potentials Recorded from Rat Barrel Cortex with Implanted Multi-Electrode Array","authors":"Xiaying Wang, M. Magno, L. Cavigelli, M. Mahmud, C. Cecchetto, S. Vassanelli, L. Benini","doi":"10.1109/BIOCAS.2018.8584830","DOIUrl":"https://doi.org/10.1109/BIOCAS.2018.8584830","url":null,"abstract":"This paper focuses on ultra-low power embedded classification of neural activities. The machine learning (ML) algorithm has been trained using evoked local field potentials (LFPs) recorded with an implanted 16×16 multi-electrode array (MEA) from the rat barrel cortex while stimulating the whisker. Experimental results demonstrate that ML can be successfully applied to noisy single-trial LFPs. We achieved up to 95.8% test accuracy in predicting the whisker deflection. The trained ML model is successfully implemented on a low-power embedded system with an average consumption of 2.6 mW.","PeriodicalId":259162,"journal":{"name":"2018 IEEE Biomedical Circuits and Systems Conference (BioCAS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129459650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.1109/BIOCAS.2018.8584772
Amir Mirbeik-Sabzevari, Negar Tavassolian, R. Ashinoff
The goal of this study is to investigate the feasibility of using millimeter-wave imaging as a new medical imaging modality for the detection of skin cancer at early stages. In a recent large-scale study, the authors have demonstrated that statistically considerable contrasts exist between the millimeter-wave dielectric properties of normal skin and skin cancer tissues. In this work, an imaging system with a record-wide bandwidth of 98 GHz was developed using the synthetic ultra-wideband millimeterwave imaging approach, a new ultra-high-resolution imaging technique recently developed by the authors. Ex-vivo imaging experiments were conducted on two freshly-excised malignant skin tissues obtained from skin cancer patients having undergone Mohs micrographic surgeries at Hackensack University Medical Center. A programmable measurement platform was designed to automatically scan the tissues across a rectangular aperture plane. Furthermore, a novel frequency-domain imaging algorithm was developed to process the recorded signals and generate an image of the cancerous tissue. The obtained images correctly identified the tumor locations as verified by Mohs histological evaluations.
{"title":"Ultra-High-Resolution Millimeter-Wave Imaging: A New Promising Skin Cancer Imaging Modality","authors":"Amir Mirbeik-Sabzevari, Negar Tavassolian, R. Ashinoff","doi":"10.1109/BIOCAS.2018.8584772","DOIUrl":"https://doi.org/10.1109/BIOCAS.2018.8584772","url":null,"abstract":"The goal of this study is to investigate the feasibility of using millimeter-wave imaging as a new medical imaging modality for the detection of skin cancer at early stages. In a recent large-scale study, the authors have demonstrated that statistically considerable contrasts exist between the millimeter-wave dielectric properties of normal skin and skin cancer tissues. In this work, an imaging system with a record-wide bandwidth of 98 GHz was developed using the synthetic ultra-wideband millimeterwave imaging approach, a new ultra-high-resolution imaging technique recently developed by the authors. Ex-vivo imaging experiments were conducted on two freshly-excised malignant skin tissues obtained from skin cancer patients having undergone Mohs micrographic surgeries at Hackensack University Medical Center. A programmable measurement platform was designed to automatically scan the tissues across a rectangular aperture plane. Furthermore, a novel frequency-domain imaging algorithm was developed to process the recorded signals and generate an image of the cancerous tissue. The obtained images correctly identified the tumor locations as verified by Mohs histological evaluations.","PeriodicalId":259162,"journal":{"name":"2018 IEEE Biomedical Circuits and Systems Conference (BioCAS)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128336424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.1109/BIOCAS.2018.8584685
Muhammad Rizwan Khan, M. Tariq, Farasat Munir, Muhammad Awais Bin Altaf
This paper presents the design of an inexpensive infusion system for low and middle-income countries like Pakistan. A flexible improvised design in terms of accuracy and user-interface is presented, based on spur gears and leadscrew. The trade-offs between accuracy and other design parameters such as weight, cost and size are also discussed. A detailed analysis of accuracy dependence on leadscrew pitch and number of teeth of each gear is given. Two prototypes are presented, with and without gearbox. An android application is developed considering widespread use of smartphones. It provides access to internet making it easy to share the data. Several alarms and feedback components have also been added to the system. Final design is efficient in terms of number of hardware components, robustness, portability, cost, power and size achieving an accuracy of 23.7nL per step of the stepper motor with 20cc reservoir.
{"title":"Spur Gears and Leadscrew Based, Efficient and Flexible Infusion System Design","authors":"Muhammad Rizwan Khan, M. Tariq, Farasat Munir, Muhammad Awais Bin Altaf","doi":"10.1109/BIOCAS.2018.8584685","DOIUrl":"https://doi.org/10.1109/BIOCAS.2018.8584685","url":null,"abstract":"This paper presents the design of an inexpensive infusion system for low and middle-income countries like Pakistan. A flexible improvised design in terms of accuracy and user-interface is presented, based on spur gears and leadscrew. The trade-offs between accuracy and other design parameters such as weight, cost and size are also discussed. A detailed analysis of accuracy dependence on leadscrew pitch and number of teeth of each gear is given. Two prototypes are presented, with and without gearbox. An android application is developed considering widespread use of smartphones. It provides access to internet making it easy to share the data. Several alarms and feedback components have also been added to the system. Final design is efficient in terms of number of hardware components, robustness, portability, cost, power and size achieving an accuracy of 23.7nL per step of the stepper motor with 20cc reservoir.","PeriodicalId":259162,"journal":{"name":"2018 IEEE Biomedical Circuits and Systems Conference (BioCAS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128534963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.1109/BIOCAS.2018.8584778
Y. Bhagat, Patrick Vcrdon, S. Avuthu, D. Parsons, M. Sussman, G. Wable, R. Hugeneck
Although electrocardiography (ECG) monitoring systems have been available in the form of wearable patches for the better part of two decades, they are limited in their ability to be utilized as inexpensive, yet vital short-term measurement devices that are (truly) completely disposable. Advancing current practices in soft conformable electronics, we present a Bluetooth-enabled, fully disposable single-lead ECG patch comprising inkjet printed Ag-AgCl electrodes and components integrated on a single, flexible hybrid printed circuit board with an average current consumption of 3.6 mA from a 3.0 V stack of four flexible Lithium polymer batteries. As part of the Live Demonstration, our goals are to showcase the patch's functionality including real-time continuous ECG display and fall detection, and the flexible enclosures and adhesives conferring its unique softness, strength and disposability following a 7-day lifespan.
{"title":"Like Kleenex for Wearables: A soft, strong and disposable ECG monitoring system","authors":"Y. Bhagat, Patrick Vcrdon, S. Avuthu, D. Parsons, M. Sussman, G. Wable, R. Hugeneck","doi":"10.1109/BIOCAS.2018.8584778","DOIUrl":"https://doi.org/10.1109/BIOCAS.2018.8584778","url":null,"abstract":"Although electrocardiography (ECG) monitoring systems have been available in the form of wearable patches for the better part of two decades, they are limited in their ability to be utilized as inexpensive, yet vital short-term measurement devices that are (truly) completely disposable. Advancing current practices in soft conformable electronics, we present a Bluetooth-enabled, fully disposable single-lead ECG patch comprising inkjet printed Ag-AgCl electrodes and components integrated on a single, flexible hybrid printed circuit board with an average current consumption of 3.6 mA from a 3.0 V stack of four flexible Lithium polymer batteries. As part of the Live Demonstration, our goals are to showcase the patch's functionality including real-time continuous ECG display and fall detection, and the flexible enclosures and adhesives conferring its unique softness, strength and disposability following a 7-day lifespan.","PeriodicalId":259162,"journal":{"name":"2018 IEEE Biomedical Circuits and Systems Conference (BioCAS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129631543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.1109/BIOCAS.2018.8584707
W. Nattakarn, M. Haruta, T. Noda, K. Sasagawa, T. Tokuda, M. Sawan, S. Carrara, J. Ohta
This work presents the concept of a battery-free, sticker-like, device for a non-invasive health-monitoring sensor. The device consists of two functional blocks: an optical power-transfer block and an amperometric measurement block. The former accumulates power from a series-connected photovoltaic cell in a capacitor and intermittently supplies the power to the amperometric measurement circuit. This circuit is driven by powering pulses and displays the amperometric current as the durations of the light pulses from a light-emitting diode. The function of the circuit was successfully demonstrated through simulations, in which the equivalent circuit of an electrochemical glucose sensor was used as an example. The simulation results showed that the proposed device would work as expected for a variety of glucose concentrations at an oxidation voltage of 0.8 V.
{"title":"Battery-Free. Sticker-Like, Device for Health Monitoring, Operated by Optical Power Transfer","authors":"W. Nattakarn, M. Haruta, T. Noda, K. Sasagawa, T. Tokuda, M. Sawan, S. Carrara, J. Ohta","doi":"10.1109/BIOCAS.2018.8584707","DOIUrl":"https://doi.org/10.1109/BIOCAS.2018.8584707","url":null,"abstract":"This work presents the concept of a battery-free, sticker-like, device for a non-invasive health-monitoring sensor. The device consists of two functional blocks: an optical power-transfer block and an amperometric measurement block. The former accumulates power from a series-connected photovoltaic cell in a capacitor and intermittently supplies the power to the amperometric measurement circuit. This circuit is driven by powering pulses and displays the amperometric current as the durations of the light pulses from a light-emitting diode. The function of the circuit was successfully demonstrated through simulations, in which the equivalent circuit of an electrochemical glucose sensor was used as an example. The simulation results showed that the proposed device would work as expected for a variety of glucose concentrations at an oxidation voltage of 0.8 V.","PeriodicalId":259162,"journal":{"name":"2018 IEEE Biomedical Circuits and Systems Conference (BioCAS)","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129988065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.1109/BIOCAS.2018.8584781
A. Khalifa, Yasha Karimi, Yuanfei Huang, M. Stanaćević, R. Etienne-Cummings
This paper highlights the challenges which exist in realizing miniaturized inductively powered devices that integrate μm-sized coils. As the amount of energy harvested is directly proportional to the effective area of the receiver coil, ultra-small coils receive very limited power and thus need to be carefully optimized for a particular application. Apart from the geometric design of the coil, there are also many other factors that impact the maximum amount of energy that can be harvested on a μm-sized coil. These unique challenges are discussed and addressed in this work using a fully integrated wireless power receiver fabricated in GF 130 nm CMOS 8RF technology. The entire system measures 300 × 300 μm2and is wirelessly powered at 1.18 GHz.
{"title":"The Challenges of Designing an Inductively Coupled Power Link for μm-sized On-Chip Coils","authors":"A. Khalifa, Yasha Karimi, Yuanfei Huang, M. Stanaćević, R. Etienne-Cummings","doi":"10.1109/BIOCAS.2018.8584781","DOIUrl":"https://doi.org/10.1109/BIOCAS.2018.8584781","url":null,"abstract":"This paper highlights the challenges which exist in realizing miniaturized inductively powered devices that integrate μm-sized coils. As the amount of energy harvested is directly proportional to the effective area of the receiver coil, ultra-small coils receive very limited power and thus need to be carefully optimized for a particular application. Apart from the geometric design of the coil, there are also many other factors that impact the maximum amount of energy that can be harvested on a μm-sized coil. These unique challenges are discussed and addressed in this work using a fully integrated wireless power receiver fabricated in GF 130 nm CMOS 8RF technology. The entire system measures 300 × 300 μm2and is wirelessly powered at 1.18 GHz.","PeriodicalId":259162,"journal":{"name":"2018 IEEE Biomedical Circuits and Systems Conference (BioCAS)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132511591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.1109/BIOCAS.2018.8584730
Peilong Feng, T. Constandinou
This paper presents a novel wireless power transfer (WPT) scheme that consists of a two-tier hierarchy of near-field inductively coupled links. Key aims are to provide efficient power transfer efficiency (PTE) and uniform energy distribution for mm-scale free-positioned neural implants. The top tier facilitates a transcutaneous link from a scalp-worn (em-scale) primary coil to a subcutaneous array of smaller, parallel-connected secondary coils. These are then wired through the skull to a corresponding set of parallel connected primary coils in the lower tier, placed epidurally. These then inductively couple to freely positioned (mm-scale) secondary coils within each subdural implant. This architecture has three key advantages: (1) the opportunity to achieve efficient energy transfer by utilising two short-distance inductive links; (2) good uniformity of the transdural power distribution through the multiple (redundant) coils; and (3) a reduced risk of infection by maintaining the dura protecting the blood-brain barrier. The functionality of this approach has been verified and optimised through HFSS simulations, to demonstrate the robustness against positional and angular misalignment. The average 11.9% PTE and 26.6% power distribution deviation (PDD) have been achieved for the Rx coil in parallel with the epidural coil array. The average PTE and PDD degenerate to 2.6% and 62.8% when the Rx coil is perpendicular to the epidural coil array.
{"title":"Robust Wireless Power Transfer to Multiple mm-Scale Freely-Positioned Neural Implants","authors":"Peilong Feng, T. Constandinou","doi":"10.1109/BIOCAS.2018.8584730","DOIUrl":"https://doi.org/10.1109/BIOCAS.2018.8584730","url":null,"abstract":"This paper presents a novel wireless power transfer (WPT) scheme that consists of a two-tier hierarchy of near-field inductively coupled links. Key aims are to provide efficient power transfer efficiency (PTE) and uniform energy distribution for mm-scale free-positioned neural implants. The top tier facilitates a transcutaneous link from a scalp-worn (em-scale) primary coil to a subcutaneous array of smaller, parallel-connected secondary coils. These are then wired through the skull to a corresponding set of parallel connected primary coils in the lower tier, placed epidurally. These then inductively couple to freely positioned (mm-scale) secondary coils within each subdural implant. This architecture has three key advantages: (1) the opportunity to achieve efficient energy transfer by utilising two short-distance inductive links; (2) good uniformity of the transdural power distribution through the multiple (redundant) coils; and (3) a reduced risk of infection by maintaining the dura protecting the blood-brain barrier. The functionality of this approach has been verified and optimised through HFSS simulations, to demonstrate the robustness against positional and angular misalignment. The average 11.9% PTE and 26.6% power distribution deviation (PDD) have been achieved for the Rx coil in parallel with the epidural coil array. The average PTE and PDD degenerate to 2.6% and 62.8% when the Rx coil is perpendicular to the epidural coil array.","PeriodicalId":259162,"journal":{"name":"2018 IEEE Biomedical Circuits and Systems Conference (BioCAS)","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130797172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.1109/BIOCAS.2018.8584700
Huan Hu, Tanzila Islam, Chung-Ching Lin, A. Kostyukova, S. Ha, Subhanshu Gupta
Biofuel cell as an efficient energy converter is a promising biocompatible technology which harvests the blood glucose into usable electrical energy and replaces the toxic lithium-based battery solutions. However, the promise of this perennial non-toxic power system is tempered by its unstable operation and low-voltage outputs leading to very limited operational lifetimes. This paper demonstrates a glucose powered analog front-end with superior noise performance, which is enabled by a standalone enzymatic biofuel cell operating for more than 30 min on active power without replenishment. Two biofuel cells are stacked to realize 0.5V output using commercially available glucose oxidase and the enzyme stability is improved via multipoint protein crosslinks by glutaraldehyde. An integrated piezo-resistive analog front-end is demonstrated including cascaded dual-supply amplifier with a successive approximation register (SAR-ADC) and single-opamp relaxation oscillator occupying 1.12mm2• A switched-resistor biasing scheme using on-chip duty-cycled clock is proposed achieving measured input-referred noise of only $0.31mu mathrm{V}_{mathrm{RMS}}$. The proposed hybrid power scheme uses $1.61mu mathrm{W}$ from the battery with 1.9 µW provided by the biofuel cell. Measured results show on-chip gain and noise variations across temperature of only 1.1 dB and $19.2 nV/sqrt{Hz}$ respectively with noise (power) efficient factor of of 1.46 (1.63).
{"title":"A 3.51µW 0.31µVrms Biofuel Cell Enabled Integrated Analog CMOS Front-End in 130 nm CMOS","authors":"Huan Hu, Tanzila Islam, Chung-Ching Lin, A. Kostyukova, S. Ha, Subhanshu Gupta","doi":"10.1109/BIOCAS.2018.8584700","DOIUrl":"https://doi.org/10.1109/BIOCAS.2018.8584700","url":null,"abstract":"Biofuel cell as an efficient energy converter is a promising biocompatible technology which harvests the blood glucose into usable electrical energy and replaces the toxic lithium-based battery solutions. However, the promise of this perennial non-toxic power system is tempered by its unstable operation and low-voltage outputs leading to very limited operational lifetimes. This paper demonstrates a glucose powered analog front-end with superior noise performance, which is enabled by a standalone enzymatic biofuel cell operating for more than 30 min on active power without replenishment. Two biofuel cells are stacked to realize 0.5V output using commercially available glucose oxidase and the enzyme stability is improved via multipoint protein crosslinks by glutaraldehyde. An integrated piezo-resistive analog front-end is demonstrated including cascaded dual-supply amplifier with a successive approximation register (SAR-ADC) and single-opamp relaxation oscillator occupying 1.12mm2• A switched-resistor biasing scheme using on-chip duty-cycled clock is proposed achieving measured input-referred noise of only $0.31mu mathrm{V}_{mathrm{RMS}}$. The proposed hybrid power scheme uses $1.61mu mathrm{W}$ from the battery with 1.9 µW provided by the biofuel cell. Measured results show on-chip gain and noise variations across temperature of only 1.1 dB and $19.2 nV/sqrt{Hz}$ respectively with noise (power) efficient factor of of 1.46 (1.63).","PeriodicalId":259162,"journal":{"name":"2018 IEEE Biomedical Circuits and Systems Conference (BioCAS)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128798909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.1109/BIOCAS.2018.8584763
Alex Marchioni, Mauro Mangia, Fabio Pareschi, R. Rovatti, G. Setti
Surface electromyography (sEMG) waveforms are widely used to generate control signals in several application areas, ranging from prosthetic to consumer electronics. Classically, such waveforms are acquired at Nyquist rate and digitally transmitted trough a wireless channel to a decision/actuation node. This causes large energy consumption and is incompatible with the implementation of ultra-low power acquisition nodes. We already proposed Compressed Sensing (CS) as a low-complexity method to achieve substantial energy saving by reducing the size of data to be transmitted while preserving the information content. We here make a significant leap forward by showing that hand movements recognition task can be performed directly in the compressed domain with a success rate greater than 98 % and with a reduction of the number of transmitted bits by two order of magnitude with respect to row data.
{"title":"Rakeness-based Compressed Sensing of Surface ElectroMyoGraphy for Improved Hand Movement Recognition in the Compressed Domain","authors":"Alex Marchioni, Mauro Mangia, Fabio Pareschi, R. Rovatti, G. Setti","doi":"10.1109/BIOCAS.2018.8584763","DOIUrl":"https://doi.org/10.1109/BIOCAS.2018.8584763","url":null,"abstract":"Surface electromyography (sEMG) waveforms are widely used to generate control signals in several application areas, ranging from prosthetic to consumer electronics. Classically, such waveforms are acquired at Nyquist rate and digitally transmitted trough a wireless channel to a decision/actuation node. This causes large energy consumption and is incompatible with the implementation of ultra-low power acquisition nodes. We already proposed Compressed Sensing (CS) as a low-complexity method to achieve substantial energy saving by reducing the size of data to be transmitted while preserving the information content. We here make a significant leap forward by showing that hand movements recognition task can be performed directly in the compressed domain with a success rate greater than 98 % and with a reduction of the number of transmitted bits by two order of magnitude with respect to row data.","PeriodicalId":259162,"journal":{"name":"2018 IEEE Biomedical Circuits and Systems Conference (BioCAS)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125423295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：