IEEE Journal on Emerging and Selected Topics in Circuits and Systems

In mobile multimedia devices with video compression capability, a large amount of power consumption is incurred by storing video data in SRAMs. The power consumption by SRAM access is reduced by decreasing the supply voltage but the decreased supply voltage may cause data loss stored in the SRAM. To reduce the probability of data loss, previous research attempts to increase the SRAM cell size, whi... View full abstract»

This paper reports a design for a complementary metal oxide semiconductor (CMOS) microelectromechanical system accelerometer used in Internet of Things (IoT) devices for seismic detection. The proposed device performs the main functions of accelerometers, and has the advantage of automatically selecting the electrostatic force of feedback to null the position of the sensor. This study applied 0.35... View full abstract»

This manuscript provides a comprehensive overview of the recent advances in the field of wireless contactless sensing circuits and systems for healthcare and biomedical applications. In particular, special emphasis is made on wireless implantable devices, radar-based techniques to detect human motions, such as vital signs or gestures, wireless neural interfacing and prosthesis, and the characteriz... View full abstract»

Unmanned Aerial Vehicle (UAV) platforms are ideal for remote life sensing applications including military, humanitarian and post-disaster search and rescue operations. Doppler radar sensors can remotely detect human respiration vital signs to assess triage but any sensor motion will corrupt the signal. The respiration signal can be recovered by measuring the platform motion with a secondary radar ... View full abstract»

Early detection of disease is essential for an efficient treatment. Bone loss can be detected and monitored by regular measurement of serum or urine C-terminal telopeptide of type 1 collagen (CTx-1). Therefore, rapid, portable and low-cost point-of-care devices are highly desirable. In this paper, we have reported an IoT-based selective, sensitive, quick and inexpensive device for the quantificati... View full abstract»

We have recently found that our previously-developed atrial fibrillation (AF) detection algorithm for smartphones can give false positives when subjects’ fingers or hands move, as we rely on proper finger placement over the smartphone camera to collect the signal of interest. Specifically, smartphone camera pulsatile signals that are obtained from normal sinus rhythm (NSR) subjects but are ... View full abstract»

A low distortion DC coupled CW radar system with high signal to noise ratio is capable of accurate representation of respiration in human subjects. We propose to test the hypothesis that a non-contact physiological radar monitoring system (PRMS) which measures and characterizes subtle body kinemat-ics, can be made to resolve patterns accurately enough to recog-nize an individual’s identity.... View full abstract»

In spintronic-based neuromorphic computing systems (NCS), the switching of magnetic moment in a magnetic tunnel junction (MTJ) is used to mimic neuron firing. However, the stochastic switching behavior of the MTJ and process variations effect lead to a significant increase in stimulation time of such NCSs. Moreover, current NCSs need an extra phase to read the MTJ state after stimulation which is ... View full abstract»

The purpose of this paper is to develop and validate a miniature system that can wirelessly acquire gastric electrical activity called slow waves, and deliver high energy electrical pulses to modulate its activity. The system is composed of a front-end unit, and an external stationary back-end unit that is connected to a computer. The front-end unit contains a recording module with three channels,... View full abstract»

This paper presents a low-noise, wireless neural recorder that has a frequency dependent amplification to remove electrode offset and attenuate motion artifacts. The recorder has 2.5 GΩ and 50 MΩ input impedance at 20 Hz and 1 kHz for recording local field potentials and extracellular spikes, respectively. To reduce the input-referred noise, we propose a low-noise frontend design wit... View full abstract»

An electromagnetic model for heart rate and respiration rate detection using the scattered fields of incident plane waves on a dielectric model of a human subject has been developed. The model approximates the torso by an equivalent homogenous dielectric layer, and utilizes an accelerated parallel version of the multi-level fast multipole algorithm to speed up the computation. Non-contact measurem... View full abstract»

A noncontact measurement of the heart rate of a specific person using an X-band radar system with a four-element antenna array is presented. The system comprises a two-dimensional planar wide-beam antenna array with a four-channel network analyzer. The direction of arrival is estimated using the Capon method, and the directionally constrained minimization-of-power algorithm is then applied to the ... View full abstract»

The spike classification is a critical step in the implantable neural decoding. The energy efficiency issue in the sensor node is a big challenge for the entire system. Compressive sensing (CS) theory provides a potential way to tackle this problem by reducing the data volume on the communication channel. However, the constant transmission of the compressed data is still energy-hungry. On the othe... View full abstract»

Unobtrusive measurement of vital signs is a research topic of increasing interest, both due to the advances in different technologies and the need for a more patient-centered healthcare. A limitation of such measurements is their sensitivity to motion artefacts, which challenges their use in daily life activities. In the present work, a novel system for the simultaneous acquisition of multi-channe... View full abstract»

With the growing attention at 60 GHz ISM band on millimeter-wave therapy for diseases treatment of sedative, antiinflammatory actions or immune system stimulation, growing demand for new biomedical monitoring and treating systems with more bandwidth, high data rates and low power creates new challenges for 60 GHz body area network. Most smart wireless sensors wireless sensing operates on battery, ... View full abstract»

In the past decade, many efforts have been devoted to indoor localization solutions. While significant progresses have been achieved, short-range localization of passive moving objects in indoor environments remains a technical challenge, especially when available radio spectrum is limited. In this work, we resolve this challenge by proposing a single-frequency continuous-wave Doppler radar sensor... View full abstract»

This paper presents a miniature inductorless impulse-radio ultra-wideband transmitter-receiver and radar for wireless short-range communication and vital-sign sensing. The all-digital transmitter generates IR-UWB pulses using edge combining technique and consumes 21.6 pJ/pulse at 10 Mbps. A novel active-inductor-based technique is proposed for LNA that achieves ultra-wideband input impedance match... View full abstract»

Human motion recognition is crucial for surveillance, search and rescue operation, smart homes, and senior care. In daily life, there exists various kinds of human motions with widely different characteristics and meanwhile they also exhibit some clustering features, which makes it difficult for recognition. In this paper, a multiple-layer classification method is introduced for comprehensive huma... View full abstract»

A high-voltage-tolerant and power-efficient stimulator with adaptive power supply is proposed and realized in a 0.18-μm 1.8-V/3.3-V CMOS process. The self-adaption bias technique and stacked MOS configuration are used to prevent issues of electrical overstress and gate-oxide reliability in low-voltage transistors. The on-chip high-voltage generator uses a pulse-skip regulation scheme to gen... View full abstract»

Sleep stage estimation is crucial to the evaluation of sleep quality and is a proven biometric in diagnosing cardiovascular diseases. In this paper, we design a CW Doppler radar to accurately measure sleep-related signals, including respiration, heartbeat and body movement. Body movement index (BMI), respiration per minute (RPM), variance of RPM, amplitude difference accumulation (ADA) of respirat... View full abstract»