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Source: IEEE Transactions on Biomedical Circuits and Systems - February 1, 2021 Category: Biomedical Engineering Source Type: research

IEEE Circuits and Systems Society
Provides a listing of current committee members and society officers. (Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - February 1, 2021 Category: Biomedical Engineering Source Type: research

Share Your Preprint Research with the World!
Prospective authors are requested to submit new, unpublished manuscripts for inclusion in the upcoming event described in this call for papers. (Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - February 1, 2021 Category: Biomedical Engineering Source Type: research

Laser Transmission Spectroscopy Based on Tunable-Gain Dual-Channel Dual-Phase LIA for Biological Nanoparticles Characterization
Size and absolute concentration of suspensions of nanoparticles are important information for the study and development of new materials and products in different industrial applications spanning from biotechnology and pharmaceutics to food preparation and conservation. Laser Transmission Spectroscopy (LTS) is the only methodology able to measure nanoparticle size and concentration by performing a single measurement. In this paper we report on a new variable gain calibration procedure for LTS-based instruments allowing to decrease of an order of magnitude the experimental indetermination of the particle size respect to the...
Source: IEEE Transactions on Biomedical Circuits and Systems - February 1, 2021 Category: Biomedical Engineering Source Type: research

Magnetic Resistance Sensory System for the Quantitative Measurement of Morphine
Point-of-care testing (POCT) is characterized by fast detection, simple use, and cost efficiency. As the focus of healthcare shifts to precision medicine, population health, and chronic disease management, the potential impact of POCT has increased significantly in the past decade. Immunochromatographic test strips (ICTSs) are currently the most promising POCT diagnostic format due to the advantages of fast detection, simple operation and cost-effective. The lateral flow immune analyzer (LFIA) system that uses magnetic resistance (MR) sensors as readers and magnetic nanoparticle labeling materials has attracted wide attent...
Source: IEEE Transactions on Biomedical Circuits and Systems - February 1, 2021 Category: Biomedical Engineering Source Type: research

Choosing the Optimal Power Coils Using Open-Source k-Oriented Design Automation
Wireless power coils have found important use in implantable medical devices for safe and reliable wireless power transfer. Designing coils for each specific application is a complex process with many interdependent design variables; determining the most optimal design parameters for each pair is challenging and time-consuming. In this paper, we develop an automated design method for planar square-spiral coils that generates the idealized design parameters for maximum power transfer efficiency according to the input design requirements. Computational complexity is first reduced by isolating the inductive coupling coefficie...
Source: IEEE Transactions on Biomedical Circuits and Systems - February 1, 2021 Category: Biomedical Engineering Source Type: research

Pulse Wave Modeling Using Bio-Impedance Simulation Platform Based on a 3D Time-Varying Circuit Model
We present extensive simulations of the arterial pulse waveform for different sensor locations, electrode sizes, current injection frequencies, and artery depths. These simulations are validated by experimental Bio-Z measurements. (Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - February 1, 2021 Category: Biomedical Engineering Source Type: research

A New Noninvasive System for Clinical Pulse Wave Velocity Assessment: The Athos Device
This paper presents a low cost, noninvasive, clinical-grade Pulse Wave Velocity evaluation device. The proposed system relies on a simultaneous acquisition of femoral and carotid pulse waves to improve estimation accuracy and correctness. The sensors used are two high precision MEMS force sensors, encapsulated in two ergonomic probes, and connected to the main unit. Data are then wirelessly transmitted to a standard laptop, where a dedicated graphical user interface (GUI) runs for analysis and recording. Besides the interface, the Athos system provides a Matlab algorithm to process the signals quickly and achieve a reliabl...
Source: IEEE Transactions on Biomedical Circuits and Systems - February 1, 2021 Category: Biomedical Engineering Source Type: research

Passive Microwave Biosensor for Real-Time Monitoring of Subsurface Bacterial Growth
A real-time and label-free microstrip sensor capable of detecting and monitoring subsurface growth of Escherichia coli (E. coli) on solid growth media such as Luria-Bertani (LB) agar is presented. The microwave ring resonator was designed to operate at 1.76 GHz to detect variations in the dielectric properties such as permittivity and loss tangent to monitor bacterial growth. The sensor demonstrated high efficiency in monitoring subsurface dynamics of E. coli growth between two layers of LB agar. The resonant amplitude variations (Δ Amplitude (dB)) were recorded for different volumes of E. coli (3 μL and...
Source: IEEE Transactions on Biomedical Circuits and Systems - February 1, 2021 Category: Biomedical Engineering Source Type: research

Deep Residual Networks for Sleep Posture Recognition With Unobtrusive Miniature Scale Smart Mat System
Sleep posture, as a crucial index for sleep quality assessment, has been widely studied in sleep analysis. In this paper, an unobtrusive smart mat system based on a dense flexible sensor array and printed electrodes along with an algorithmic framework for sleep posture recognition is proposed. With the dense flexible sensor array, the system offers a comfortable and high-resolution solution for long-term pressure sensing. Meanwhile, compared to other methods, it reduces production costs and computational complexity with a smaller area of the mat and improves portability with fewer sensors. To distinguish the sleep posture,...
Source: IEEE Transactions on Biomedical Circuits and Systems - February 1, 2021 Category: Biomedical Engineering Source Type: research

Simple Smart Implants: Simultaneous Monitoring of Loosening and Temperature in Orthopaedics With an Embedded Ultrasound Transducer
Implant failure can have devastating consequences on patient outcomes following joint replacement. Time to diagnosis affects subsequent treatment success, but current diagnostics do not give early warning and lack accuracy. This research proposes an embedded ultrasound system to monitor implant fixation and temperature – a potential indicator of infection. Requiring only two implanted components: a piezoelectric transducer and a coil, pulse-echo responses are elicited via a three-coil inductive link. This passive system avoids the need for batteries, energy harvesters, and microprocessors, resulting in minimal change...
Source: IEEE Transactions on Biomedical Circuits and Systems - February 1, 2021 Category: Biomedical Engineering Source Type: research

Towards Development of a Non–Intrusive and Label–Free THz Sensor for Rapid Detection of Aqueous Bio–Samples Using Microfluidic Approach
As most of the bio-molecules sizes are comparable to the terahertz (THz) wavelength, this frequency range has spurred great attention for bio-medical and bio-sensing applications. Utilizing such capabilities of THz electromagnetic wave, this paper presents the design and analysis of a new non-intrusive and label-free THz bio-sensor for aqueous bio-samples using the microfluidic approach with real-time monitoring. The proposed THz sensor unit utilizes the highly confined feature of the localized spoof surface plasmon (LSSP) resonator to get high sensitivity for any minute change in the dielectric value near it's surf...
Source: IEEE Transactions on Biomedical Circuits and Systems - February 1, 2021 Category: Biomedical Engineering Source Type: research

A 13.56-MHz −25-dBm-Sensitivity Inductive Power Receiver System-on-a-Chip With a Self-Adaptive Successive Approximation Resonance Compensation Front-End for Ultra-Low-Power Medical Implants
Battery-less and ultra-low-power implantable medical devices (IMDs) with minimal invasiveness are the latest therapeutic paradigm. This work presents a 13.56-MHz inductive power receiver system-on-a-chip with an input sensitivity of −25.4 dBm (2.88 μW) and an efficiency of 46.4% while driving a light load of 30 μW. In particular, a real-time resonance compensation scheme is proposed to mitigate resonance variations commonly seen in IMDs due to different dielectric environments, loading conditions, and fabrication mismatches, etc. The power-receiving front-end incorporates a 6-bit capacitor bank t...
Source: IEEE Transactions on Biomedical Circuits and Systems - February 1, 2021 Category: Biomedical Engineering Source Type: research

13.56 MHz Triple Mode Rectifier Circuit With Extended Coupling Range for Wirelessly Powered Implantable Medical Devices
In this work, a wide input/output range triple mode rectifier circuit operating at 13.56 MHz is implemented to power up medical implants. The proposed novel multi-mode rectifier circuit charges the load for an extended coupling range and eliminates the requirement of alignment magnets. The charging process is achieved in three different modes based on the voltage level of the received signal affected by the distance and the alignment of the inductively coupled coils. Current mode (CM) circuit is activated for loosely coupled coils whereas voltage mode (VM) rectification is proposed for high coupling ratios. Extended c...
Source: IEEE Transactions on Biomedical Circuits and Systems - February 1, 2021 Category: Biomedical Engineering Source Type: research

16.8 nW Ultra-Low-Power Energy Harvester IC for Tiny Ingestible Sensors Sustained by Bio-Galvanic Energy Source
Herein, we present a 16.8 nW ultra-low-power (ULP) energy harvester integrated circuit (IC) for ingestible biomedical sensors. The energy harvester can be powered from the electro-galvanic operation inside a human body, which provides a sustainable and long-term energy source. The challenge of dealing with relatively high input impedance (∼kΩ) of the bio-galvanic energy source is addressed by introducing two design techniques. The first technique is an adaptive VMPP-controlled algorithm (AVCA) for a maximum power point tracking (MPPT) controller, and the second technique is a ULP delay-line-based zero current swi...
Source: IEEE Transactions on Biomedical Circuits and Systems - February 1, 2021 Category: Biomedical Engineering Source Type: research

A Novel Low-Cost Wireless Footwear System for Monitoring Diabetic Foot Patients
This study presents a novel low-cost shoe system for daily monitoring of plantar pressure in diabetics. It includes an insole with pressure sensor array, which can dynamically monitor the plantar pressure and display the changes of plantar pressure in real time in the mobile phone to provide early warning for patients with high risk of diabetic foot. As for the sensor, copper and carbon black were adopted as the electrode and conductive filler respectively, enabling a mass production with low price. It was soft and bendable, meeting the performance needs of daily plantar pressure monitoring. All devices were encapsulated i...
Source: IEEE Transactions on Biomedical Circuits and Systems - February 1, 2021 Category: Biomedical Engineering Source Type: research

A DSP Architecture for Distortion-Free Evoked Compound Action Potential Recovery in Neural Response Telemetry System
This paper presents a digital signal processing (DSP) architecture for real-time and distortion-free recovery of electrically-evoked compound action potentials (ECAPs) from stimulus artifacts and periodic noises in bidirectional neural response telemetry (NRT) system. In this DSP architecture, a low computation-cost bidirectional-filtered coherent averaging (BFCA) method is proposed for programmable linear-phase filtering of ECAPs, which can be easily combined with the alternating-polarity (AP) stimulation method to reject stimulus artifacts overlapped with ECAP responses. Design techniques including the configurable folde...
Source: IEEE Transactions on Biomedical Circuits and Systems - February 1, 2021 Category: Biomedical Engineering Source Type: research

Review and Challenges of Technologies for Real-Time Human Behavior Monitoring
A person's behavior significantly influences their health and well-being. It also contributes to the social environment in which humans interact, with cascading impacts to the health and behaviors of others. During social interactions, our understanding and awareness of vital nonverbal messages expressing beliefs, emotions, and intentions can be obstructed by a variety of factors including greatly flawed self-awareness. For these reasons, human behavior is a very important topic to study using the most advanced technology. Moreover, technology offers a breakthrough opportunity to improve people's social aware...
Source: IEEE Transactions on Biomedical Circuits and Systems - February 1, 2021 Category: Biomedical Engineering Source Type: research

IEEE Transactions on Biomedical Circuits and Systems
Provides a listing of current staff, committee members and society officers. (Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - February 1, 2021 Category: Biomedical Engineering Source Type: research

Table of contents
Presents the table of contents for this issue of this publication. (Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - February 1, 2021 Category: Biomedical Engineering Source Type: research

2020 Index IEEE Transactions on Biomedical Circuits and Systems Vol. 14
(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

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Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

IEEE Circuits and Systems Society
(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

Share Your Preprint Research with the World!
(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

Call for Proposals: Special Issues IEEE Transactions on Biomedical Circuits and Systems
(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

Erratum to “A Low Power and Real-Time Architecture for Hough Transform Processing Integration in a Full HD-Wireless Capsule Endoscopy”
(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

Erratum to “A 3-Mbps, 802.11g-Based EMG Recording System With Fully Implantable 5-Electrode EMG Acquisition Device”
(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

Design and Implementation of an Intelligent Analgesic Bracelet Based on Wrist-ankle Acupuncture
A flexible, multifunctional, and intelligent analgesic bracelet was proposed in this article to alleviate symptoms of pain. Based on the theory of wrist-ankle acupuncture in traditional Chinese medicine, transcutaneous electrical nerve stimulation is the technical basis of the method. A set of targeted circuit system capable of generating adjustable electrical stimulation signals to simulate filamentary acupuncture was designed. The system architecture includes a wireless communication module, a signal control module, a stimulus signal generation module, and a wearable, flexible bracelet. In addition, a pain assessment int...
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

Design of a Low Noise Bio-Potential Recorder With High Tolerance to Power-Line Interference Under 0.8 V Power Supply
A bio-potential recorder working under 0.8 V supply voltage with a tunable low-pass filter is proposed in this paper. The prototype is implemented in TSMC 180 nm CMOS technology, featuring a power consumption of 2.27 $mu$W, while preserving a high tolerance of power-line interference (PLI) up to 600 m$V_{pp}$, a common-mode rejection ratio (CMRR) of higher than 100 dB, a THD of −65.5 dB, and a noise density of 50 nV/$sqrt{Hz}$ by employing four new techniques, including 1) low noise chopper modulator, 2) feedback loop based common-mode cancellation loop (CMCL), 3) offset cancellation loo...
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

Non-Invasive Real-Time Monitoring of Glucose Level Using Novel Microwave Biosensor Based on Triple-Pole CSRR
Planar microwave sensors are considered an attractive choice to noninvasively probe the dielectric attributes of biological tissues due to their low cost, simple fabrication, miniature scale, and minimum risk to human health. This paper develops and measures a novel microwave biosensor for non-invasive real-time monitoring of glucose level. The design comprises a rectangular plexiglass channel integrated on a triple-pole complementary split ring resonator (TP-CSRR). The proposed sensor operates in the centimeter-wave range 1–6 GHz and is manufactured using PCB on top of an FR4 dielectric substrate. The sensor el...
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

Long-Term Non Anesthetic Preclinical Study Available Extra-Cranial Brain Activator (ECBA) System for the Future Minimally Invasive Human Neuro Modulation
In this study, we propose a complete system of an implantable platform for long-term preclinical brain studies. Our proposed system, the extra-cranial brain activator (ECBA), consists of a titanium-packaged implantable module and a helmet-type base station that powers the module wirelessly. The ECBA can also be controlled by a remote handheld device. Using the ECBA, we performed a long-term non-anesthetic study with multiple canine subjects, and the resulting PET-CT scans demonstrated remarkable enhancement in brain activity relating to memory and sensory skills. Furthermore, the histological analysis and high-temperature ...
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

Optimizing Volumetric Efficiency and Backscatter Communication in Biosensing Ultrasonic Implants
Ultrasonic backscatter communication has gained popularity in recent years with the advent of deep-tissue sub-mm scale biosensing implants in which piezoceramic (piezo) resonators are used as acoustic antennas. Miniaturization is a key design goal for such implants to reduce tissue displacement and enable minimally invasive implantation techniques. Here, we provide a systematic design approach for the implant piezo geometry and operation frequency to minimize the overall volume of the implant. Optimal geometry of the implant piezo for backscatter communication is discussed and contrasted with that of power harvesting. A cr...
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

Biological Living Cell in-Flow Detection Based on Microfluidic Chip and Compact Signal Processing Circuit
Detection and counting of biological living cells in continuous fluidic flows play an essential role in many applications for early diagnosis and treatment of diseases. In this regard, this study highlighted the proposal of a biochip system for detecting and enumerating human lung carcinoma cell flow in the microfluidic channel. The principle of detection was based on the change of impedance between sensing electrodes integrated in the fluidic channel, due to the presence of a biological cell in the sensing region. A compact electronic module was built to sense the unbalanced impedance between the sensing microelectrodes. ...
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

A Two-Electrode, Double-Pulsed Sensor Readout Circuit for Cardiac Troponin I Measurement
This paper presents a pulse-stimulus sensor readout circuit for use in cardiovascular disease examinations. The sensor is based on a gold nanoparticle plate with an antibody post-modification. The proposed system utilizes gated pulses to detect the biomarker Cardiac Troponin I in an ionic solution. The characteristic of the electrostatic double-layer capacitor generated by the analyte is related to the concentration of Cardiac Troponin I in the solvent. After sensing by the transistor, a current-to-frequency converter (I-to-F) and delay-line-based time-to-digital converter (TDC) convert the information into a series of dig...
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

Signal Separation and Tracking Algorithm for Multi-Person Vital Signs by Using Doppler Radar
Noninvasive monitoring is an important Internet-of-Things application, which is made possible with the advances in radio-frequency based detection technologies. Existing techniques however rely on the use of antenna array and/or frequency modulated continuous wave radar to detect vital signs of multiple adjacent objects. Antenna size and limited bandwidth greatly limit the applicability. In this paper, we propose our system termed ‘DeepMining’ which is a single-antenna, narrowband Doppler radar system that can simultaneously track the respiration and heartbeat rates of multiple persons with high accuracy. DeepM...
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

CMOS Gaussian Monocycle Pulse Transceiver for Radar-Based Microwave Imaging
A single-chip Gaussian monocycle pulse (GMP) transceiver was developed for radar-based microwave imaging by the use of 65-nm complementary metal oxide semiconductor (CMOS) technology. A transmitter (TX) generates GMP signals, whose pulse widths and −3 dB bandwidths are 192 ps and 5.9 GHz, respectively. A 102.4 GS/s equivalent time sampling receiver (RX) performs the minimum jitter, input referred noise, signal-to-nose-ratio (SNR), signal-to-noise and distortion ratio (SNDR) effective number of bits (ENOB) of 0.58 ps, 0.24 mVrms, 28.4 dB, 26.6 dB and 4.1 bits, respectively. The SNR for the bandwidth of 3.6 GHz is...
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

On-Device Reliability Assessment and Prediction of Missing Photoplethysmographic Data Using Deep Neural Networks
Photoplethysmographic (PPG) measurements from ambulatory subjects may suffer from unreliability due to body movements and missing data segments due to loosening of sensor. This paper describes an on-device reliability assessment from PPG measurements using a stack denoising autoencoder (SDAE) and multilayer perceptron neural network (MLPNN). The missing segments were predicted by a personalized convolutional neural network (CNN) and long-short term memory (LSTM) model using a short history of the same channel data. Forty sets of volunteers’ data, consisting of equal share of healthy and cardiovascular subjects were u...
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

Recursive Threshold Logic—A Bioinspired Reconfigurable Dynamic Logic System With Crossbar Arrays
The neuron behavioral models are inspired by the principle of the firing of neurons, and weighted accumulation of charge for a given set of input stimuli. Biological neurons show dynamic behavior through its feedback and feedforward time-dependent responses. The principle of the firing of neurons inspires threshold logic design by applying threshold functions on the weight summation of inputs. In this article, we present a recursive threshold logic unit that uses the output feedback from standard threshold logic gates to emulate Boolean expressions in a time-sequenced manner. The Boolean expression is implemented with an a...
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

Spintronic Sensors Based on Magnetic Tunnel Junctions for Wireless Eye Movement Gesture Control
The tracking of eye gesture movements using wearable technologies can undoubtedly improve quality of life for people with mobility and physical impairments by using spintronic sensors based on the tunnel magnetoresistance (TMR) effect in a human–machine interface. Our design involves integrating three TMR sensors on an eyeglass frame for detecting relative movement between the sensor and tiny magnets embedded in an in-house fabricated contact lens. Using TMR sensors with the sensitivity of 11 mV/V/Oe and ten
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

Wearable Wireless-Enabled Oscillometric Sphygmomanometer: A Flexible Ambulatory Tool for Blood Pressure Estimation
This article presents the design of an unobtrusive and wireless-enabled blood pressure (BP) monitoring system that is suitable for ambulatory use. By adopting low-profile electromechanical actuators and a compact printed circuit board design, this lightweight device can be worn directly on the occlusive cuff, therefore eliminating the need of a long and obtrusive tubing interconnect between the device and the cuff, as seen in traditional ambulatory BP monitors (ABPM). Instead of executing the BP estimation algorithm directly on the device, the proposed design rather sends the raw oscillometric signal through a Bluetooth Lo...
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

An Energy-Efficient Optically-Enhanced Highly-Linear Implantable Wirelessly-Powered Bidirectional Optogenetic Neuro-Stimulator
This paper presents an energy-efficient mm-scale self-contained bidirectional optogenetic neuro-stimulator, which employs a novel highly-linear $mu$LED driving circuit architecture as well as inkjet-printed custom-designed optical $mu$lenses for light directivity enhancement. The proposed current-mode $mu$LED driver performs linear control of optical stimulation for the entire target range ($
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

Body-Area Powering With Human Body-Coupled Power Transmission and Energy Harvesting ICs
This paper presents the body-coupled power transmission and ambient energy harvesting ICs. The ICs utilize human body-coupling to deliver power to the entire body, and at the same time, harvest energy from ambient EM waves coupled through the body. The ICs improve the recovered power level by adapting to the varying skin-electrode interface parasitic impedance at both the TX and RX. To maximize the power output from the TX, the dynamic impedance matching is performed amidst environment-induced variations. At the RX, the Detuned Impedance Booster (DIB) and the Bulk Adaptation Rectifier (BAR) are proposed to improve the powe...
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

An Active Concentric Electrode for Concurrent EEG Recording and Body-Coupled Communication (BCC) Data Transmission
This paper presents a wearable active concentric electrode for concurrent EEG monitoring and Body-Coupled Communication (BCC) data transmission. A three-layer concentric electrode eliminates the usage of wires. A common mode averaging unit (CMAU) is proposed to cancel not only the continuous common-mode interference (CMI) but also the instantaneous CMI of up to 51Vpp. The localized potential matching technique removes the ground electrode. An open-loop programmable gain amplifier (OPPGA) with the pseudo-resistor-based RC-divider block is presented to save the silicon area. The presented work is the first reported so far to...
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

MagNI: A Magnetoelectrically Powered and Controlled Wireless Neurostimulating Implant
This paper presents the first wireless and programmable neural stimulator leveraging magnetoelectric (ME) effects for power and data transfer. Thanks to low tissue absorption, low misalignment sensitivity and high power transfer efficiency, the ME effect enables safe delivery of high power levels (a few milliwatts) at low resonant frequencies ($sim$250 kHz) to mm-sized implants deep inside the body (30-mm depth). The presented MagNI (Magnetoelectric Neural Implant) consists of a 1.5-mm$^2$ 180-nm CMOS chip, an in-house built 4 × 2 mm ME film, an energy storage capacitor, and on-board electrodes on...
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

1225-Channel Neuromorphic Retinal-Prosthesis SoC With Localized Temperature-Regulation
A 1225-Channel Neuromorphic Retinal Prosthesis (RP) SoC is presented. Existing RP SoCs directly convert light intensity to electrical stimulus, which limit the adoption of delicate stimulus patterns to increase visual acuity. Moreover, a conventional centralized image processor leads to the local hot spot that poses a risk to the nearby retinal cells. To solve these issues, the proposed SoC adopts a distributed Neuromorphic Image Processor (NMIP) located within each pixel that extracts the outline of the incoming image, which reduces current dispersion and stimulus power compared with light-intensity proportional stimulus ...
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

A Millimeter-Scale Crystal-Less MICS Transceiver for Insertable Smart Pills
This paper presents a millimeter-scale crystal-less wireless transceiver for volume-constrained insertable pills. Operating in the 402–405 MHz medical implant communication service (MICS) band, the phase-tracking receiver-based over-the-air carrier recovery has a ±160 ppm coverage. A fully integrated adaptive antenna impedance matching solution is proposed to calibrate the antenna impedance variation inside the body. A tunable matching network (TMN) with single inductor performs impedance matching for both transmitter (TX) and receiver (RX) and TX/RX mode switching. To dynamically calibrate the antenna impedan...
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

A Trimodal Wireless Implantable Neural Interface System-on-Chip
A wireless and battery-less trimodal neural interface system-on-chip (SoC), capable of 16-ch neural recording, 8-ch electrical stimulation, and 16-ch optical stimulation, all integrated on a 5 ×  3 mm2 chip fabricated in 0.35-μm standard CMOS process. The trimodal SoC is designed to be inductively powered and communicated. The downlink data telemetry utilizes on–off keying pulse-position modulation (OOK-PPM) of the power carrier to deliver configuration and control commands at 50 kbps. The analog front-end (AFE) provides adjustable mid-band gain of 55–70 dB, low/high cut-off frequencies of 1&...
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

A Dual-Output Single-Stage Regulating Rectifier With PWM and Dual-Mode PFM Control for Wireless Powering of Biomedical Implants
This paper presents a reconfigurable, dual-output, regulating rectifier featuring pulse width modulation (PWM) and dual-mode pulse frequency modulation (PFM) control schemes for single-stage ac-to-dc conversion to provide two independently regulated supply voltages (each in 1.5–3 V) from an input ac voltage. The dual-mode PFM controllers feature event-driven regulation as well as frequency division. The former incorporates stable, fast, digital feedback loops to adaptively adjust the driving frequency of four power transistors, MP1∼4, based on the desired output power level to perform voltage regulation and deliv...
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

A 280 μW, 108 dB DR PPG-Readout IC With Reconfigurable, 2nd-Order, Incremental ΔΣM Front-End for Direct Light-to-Digital Conversion
This paper reports on a low-power readout IC (ROIC) for high-fidelity recording of the photoplethysmogram (PPG) signal. The system comprises a highly reconfigurable, continuous-time, second-order, incremental delta-sigma modulator (I–ΔΣM) as a light-to-digital converter (LDC), a 2-channel 10b light-emitting diode (LED) driver, and an integrated digital signal processing (DSP) unit. The LDC operation in intermittent conversion phases coupled with digital assistance by the DSP unit allow signal-aware, on-the-fly cancellation of the dc and ambient light-induced components of the photodiode current for more e...
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research

Guest Editorial: Selected Papers From the 2020 IEEE International Solid-State Circuits Conference
(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - December 1, 2020 Category: Biomedical Engineering Source Type: research