The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Successive Approximation Register analog-to-digital converters (SAR ADC) have received increasing attention due to their direct benefit from technology scaling. However, while the achievable speed has been improved significantly, the reported effective resolutions are usually limited below 12 bits. This is mostly caused by the limited accuracy of the common implementation of the internal digital-to-analog...
After having long been used in military radio applications, Ultra-Wideband Impulse Radio (UWB-IR) is now emerging as a communication technology suitable for short-range, low-data rate radio links in applications with a tight energy budget, such as wireless sensor networks, neural recording, etc. As a significant example of this trend, this paper presents the design of fully integrated UWB-IR transmitters...
The XG-PON standard for Passive Optical Networks (PONs) requires the utilization of a Reed-Solomon block code at a 10Gbps downstream rate, dictating low latency and high throughput processing, no word interleaving and no stall between codewords. The current paper presents in detail a parallel architecture which decodes the RS(248,216) shortened code in the XG-PON ONT/ONU receiver. Based on a modified...
A genetic algorithm (GA) was used to determine the optimal architecture and input parameters of a feed-forward artificial neural network (ANN), the purpose of which was to synthesize a radio-frequency, low noise amplifier (RF-LNA) circuit. The parameters (chromosomes) processed by the GA included: i) the LNA performance specifications and design constraints; ii) the type of ANN to use multi-layer...
Our research institute focuses on wireless autonomous transducer systems. Body-area-networks have a particular research challenge, since wireless communications close to the body, or even inside the body (implants) is heavily influenced by the dielectric and conductive losses of human tissue. This paper describes a case study to define the specifications for a 400 MHz transceiver operating internal...
Investigations of margins for the interplay of a readout system dedicated to neutrons detection and discrimination using a digital testing tool is presented. The readout system and the developed tool are detailed. The different results of simulation provided by this tool and related characteristics of the processing chain are also presented.
Although the electrical benefits are greatly increasing in miniaturized integrated circuits, their corresponding design and reliability issues are also being raised. This work aims at the multiphysics simulation of integrated circuits that allows the designer to monitor the electrical, thermal and mechanical long term behaviour of the circuit from its early design stages. The multi-physics simulation...
This paper presents a smart sensor microphone based on silicon nanowire resistive gauge for hearing aid applications through cochlear implant. The system includes the sensor together with its bias circuit, the preconditioning stage and the digital interface that ease integration on heterogenic system. One important concern of audio field is the wide dynamic range addressed since human hear is able...
An original arbitrary waveform generator (AWG) architecture suited for software radio (SR) transmission is presented. A piecewise linear approximation of the wanted signal is generated thanks to a predefined set of slopes. The digital-to-analog (DA) conversion involved in this operation is based on a differential digital coding which drives a custom digital-to-analog converter (DAC), named here the...
In this paper we advocate the use of nano-electro-mechanical switches (NEMS) to eliminate static power consumption, and propose a dual-voltage hybrid NEMS-CMOS scheme to also reduce dynamic power consumption. The main idea is to use a smaller voltage to propagate information, and a larger voltage to drive the NEMS. CMOS amplifiers are used to interface these two voltages. It follows that synthesizing...
Neurosurgeons require a good sense of three-dimensional spatial perception based on diagnostic imaging and patient's brain anatomy, a correct handling of surgical instruments and a very good fine motor control, the acquisition of these skills can only be achieved through continued practical experience. This paper presents preliminary results of the implementation of an instrumented glove for the capture...
Energy can be harvested from ambient sources such as vibration, wireless, thermal and solar. Using energy harvesting in running ultra-low power systems could potentially enable battery-free operation in many applications, especially in wearable and implantable biomedicai devices. A special energy efficient interface circuit, which transfers harvested energy to be utilized by the load, is an essential...
In this work, a novel approach to the modeling of ESD protection elements multi-layer varistors (MLV) is presented. Based on measurements of the static I-V-characteristics, an approach similar to the EKV model is used instead of the known ideal I-V-characteristics in the threshold voltage region. Additionally, an equivalent circuit for the representation of the impedance frequency response (especially...
Our analytical compact drain current model for undoped or lightly doped nanoscale FinFETs has been successfully used to predict variability in the electrical characteristics of FinFETs. A simplified version of the model behaves almost as good as the analytical model but is more computational time efficient. Implementation of the models in verilog-A can be used to predict variability in circuits such...
The paper describes an ASIC implementation of a previously implemented FPGA linear congruence solver, part of a parallel system for solution of linear equations, and presents synthesis results for three different standard cell libraries. The previous VHDL design was adapted to three ASIC technologies (130 nm, 110 nm, and 55 nm) from two different vendors and the synthesized results were mutually compared...
Large-scale neuromorphic systems exploit the rapid development of VLSI technology to emulate a wide variety of contemporary neuroscientific models, providing high integration density and power efficiency. One crucial aspect of these systems is the implementation of a routing architecture for the pulse events produced by the neural computation. In this paper we present such a design capable to successfully...
Using the plane-wave numerical expansion method, we investigate the band gap spectra of two-dimensional photonic crystals created by square and hexagonal lattices consisting of coating rods with a thin air layer in a titanium dioxide (TiO2)matrix. Our results show that in a square lattice a coating alone does not help to create an absolute PBG. However, we showed that adding air hole into the center...
In this work, a new algorithm to generate high quality side information in Wyner-Ziv video coding is proposed. A block-matching algorithm is incorporated into the forward and backward optical flow and warping algorithms to find the forward and backward motion fields that are used for frame interpolation. Also, a symmetric optical flow algorithm for the purpose of frame interpolation is obtained by...
This paper describes the design optimization and analysis of the digital hardware of a high-speed direct digital frequency synthesizer (DDFS) implemented using the NanGate 45nm Open Cell library. The digital blocks of the DDFS generate 13-bit accurate sinusoidal waveform in the frequency range of 0–500 MHz. The DDFS uses a 1.5 GHz input clock, a ROM-less phase to amplitude converter (PAC) based on...
This paper presents the design of a low-power high-dynamic-range analog-to-digital converter (ADC) for solid-state radiation detectors, in particular Cadmium Zinc Telluride (CZT). The core of the ADC consists of a Wilkinson-type digitizer, a digital control unit and a 9-bit counter. The analog core of the ADC operates from a 3.3 V supply while the supply for the digital control circuitry is 1.2 V...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.