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Next-generation teleimmersive environments allow full-fledged collaboration of people in different geographical locations. The unique user experience poses new inter-sender synchronization requirement, which has not been investigated in past studies. The real-time nature of teleimmersive applications also introduce a tradeoff between synchronization quality and interactive quality during online synchronization...
Two rail-to-rail class-AB buffers with high driving capability and high speed are presented. One circuit uses two complementary differential flipped voltage follower (DFVF) transconductor circuits and other circuit uses two complementary differential flipped voltage follower transconductors with current sensing transistor. These proposed class-AB buffers are boosted by a pair of adaptive biasing circuit's...
Most of the literature on Ultra Wide Band (UWB) transmitters is focused on indoor communications. This paper presents the architecture of an Impulse Radio Ultra Wide Band (IR-UWB) transmitter for outdoor communications which complies with the FCC spectral limits. The transmitter consists of a pulse generator (PG) and a deriver circuit and has an operating frequency between 3.1 GHz and 6.4 GHz. The...
Spectral activity detection in wideband radio-frequency (RF) signals for cognitive-radio applications typically necessitates expensive and energy-inefficient analog-to-digital converters (ADCs). In this paper, we present a novel compressive sensing (CS)-based analog front-end, which is able to sample sparse wideband RF signals at low cost and low power. The analog front-end consists of a pseudo-random...
In this paper we present a low power, low noise CMOS micro-brain-implant which records both brain's electrical and chemical activities. We minimized the power consumption and silicon area by exploiting opamp sharing technique. This wide dynamic range (85 dB) micro device consists of a single nano-watt power amplifier for both micromolar neurotransmitter sensing and micro voltage action-potential recording...
This paper presents an alternative linear topology for conditioning resistive sensors. This topology allows us to obtain an inherently linear relationship between the variable measured by the sensor and its corresponding output, which is not always valid for the topologies most commonly employed in industrial applications, such as the Wheatstone bridge. SPICE simulations of this alternative topology...
In this paper, a dual-channel interferometer-based capacitive sensor with high sensitivity is implemented in 65nm CMOS. Such architecture facilitates high throughput flow cytometry applications using intrinsic EM signatures of biological cells. To enhance SNR, injection-locked oscillator is utilized to perform phase amplification with regard to capacitance-induced frequency shift. Noise from on-chip...
CMOS chips are increasingly used for direct sensing and interfacing with fluidic and biological systems. CMOS circuits for sample acquisition, signal processing, and readout have been integrated with various sensors to form complex biosystems-on-chip. However, distinct and vexing technical challenges arise from the disparate requirements of biosensors and integrated circuits. From the perspective...
This paper presents the concept of a ratiometric approach for DNA methylation detection using the “Methylation Cell” for the indication of epigenetic abnormalities related to cancer. The “Methylation Cell” allows real-time detection of pH signals resulting from DNA based reactions using ISFET sensors, performing continuous computation of the ratio of DNA methylation, giving a discrete output signal...
Multi-frequency signals are important for a variety of sensing and instrumentation applications. These include various impedimetric applications inhibiting a time-varying behavior, where a system has to be characterized rapidly across a specific bandwidth. In this paper a novel CMOS system is presented, which can generate a multi-sine signal with components of any desired frequency and amplitude,...
Thin-film MEMS bridges as micro-resonators have proven attractive for various sensing applications (acceleration, mass, chemical, pressure, etc.) by using frequency shift as a basis for sensing [1]. Low-temperature processing of amorphous-silicon (a-Si:H) enables low-cost fabrication of high-Q MEMS bridges having excellent compatibility with CMOS post processing. However, the a-Si:H bridges have weak...
A 64×64 CMOS ion-image sensor is demonstrated towards accurate high-throughput DNA sequencing. Dual-mode (pH/image) sensing is performed with ion-sensitive field-effect transistor (ISFET) fabricated in standard CMOS image sensor (CIS) process. After addressing physical locations of DNA slices by optical contact imaging, local pH for one DNA slice can be mapped to its physical address with accurate...
The research of vital sign radars using microwave technologies grows rapidly in recent years. Such type of radars, whether using continuous-wave (CW), ultra-wideband (UWB), or other types of signals, spurred interests and new applications because of the capability of detecting respiration and heartbeat without any sensor device contacting the body. Several applications that may potentially save lives...
This paper presents a current-mode adaptively hysteretic control (CMAHC) technique to achieve the fast transient response for DC-DC buck converters. A complementary full range current sensor comprising of charging-path and discharging-path sensing transistors is proposed to track the inductor current seamlessly. With the proposed current-mode adaptively hysteretic topology, the inductor current is...
A fully CMOS compatible embedded multiple-time programmable (MTP) memory system using the standard TSMC 0.35 µm CMOS process is presented. The memory cells and the control circuits without extra processing steps do not violate design/electrical rules. By employing the high-voltage tolerant circuit design techniques with the current sense amplifiers, the simulation and measurement results reveal the...
A blind classification processor for cognitive radios is realized in 40nm CMOS, featuring three-step parameter estimation for a 59× energy saving compared to an exhaustive method, and multi-algorithm feature extraction to distinguish five modulation classes: multicarrier, single-carrier PSK/QAM/MSK, and spread-spectrum signals. The chip consumes 17µJ within 2ms sensing time per classification, achieving...
Pulse diagnosis is one of major methods used in traditional Chinese medicine to evaluate a patient's health conditions. Development of a pulse diagnosis apparatus can lead to modernization and advancement of the field by providing more objective and accurate evaluations. This study aims at demonstrating real-time pulse measurement by using the developed flexible capacitive pressure sensors. A 5 ×...
A bi-axial scanning micromirror is typically used for scanning-type projectors to receive and deflect laser beams to form two-dimensional images pixel by pixel. The operation requires the micromirror to be driven at its resonant frequency which can vary due to fabrication tolerance and temperature drift, necessitating the use of a closed-loop oscillator circuit. This study reports capacitive driving...
Active-pixel CMOS image sensors have many attractive features, such as low power consumption, integrated on peripheral circuits, and nondestructive column-parallel readouts. Integrated on signal-processing circuits, they provide the advantages of high-speed parallel operation and lower power consumption, features which meet the special requirements of CMOS image sensors. A number of integrated signal...
Significant progress has been made in the field of neural prosthetics lately. In order to improve and invent novel wearable and implantable devices, low power consumption is one of the most important concerns. This article discusses low power circuits which are designed, fabricated and tested in our lab which are essential building blocks for neural prosthetics. The circuits include a nano-power current...
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