IMEKO Event Proceedings

Page 6 of 770 Results 51 - 60 of 7695

Salim Alahdab, Reza Lotfi, Wouter A. Serdijn
A 1-V 416-nW FULLY INTEGRATED SENSOR INTERFACE IC FOR PACEMAKERS

An ultra-low-power, low-noise sensor interface IC for pacemakers is presented. The proposed architecture is designed to achieve small chip area and a good trade-off between power consumption and noise figure by using current-mode operation. The IECG signal, from 50 mHz-100 Hz, is first filtered by a bandpass filter. Subsequently, the signal output of the filter is converted into a current by a nonlinear transconductance (Gm) cell. The output of the Gm-cell is digitized by a nonlinear 8-bit 1 kS/s Current-mode Successive Approximation ADC to compensate for the nonlinearity of the Gm-cell. The simulated input-referred noise is 5.48 µVrms, achieving a Noise Efficiency Factor of 3.3, and the simulated power consumption for the overall system is 416 nW while operating from a 1 V supply.

S. Marabelli, A. Fornasari, P. Malcovati, F. Maloberti
A 14-BIT BANDPASS MASH SIGMA-DELTA PIPELINE A/D CONVERTER

In this paper a two stage bandpass MASH (multi-stage noise shaping) sigma-delta (Σ∆) modulator is presented. A resolution of 14 bits has been achieved over a 5 MHz band around an intermediate frequency (IF) of 20 MHz with a clock frequency of 80 MHz. This performance is obtained using a 6-th order bandpass Σ∆ modulator followed by a 10 bit pipeline converter. The proposed circuit has been extensively simulated, both at behavioral and at circuit level, and results are illustrated.

Henrik Volkers, Thomas Bruns
A 2-DOF MODEL FOR BACK-TO-BACK SHOCK TRANSDUCER

By applying a two-degree-of-freedom system model (2-DOF) for an Endevco type 2270 back-to-back reference accelerometer, systematic deviations between measured and fitted 1-DOF transfer functions could be improved. Some key information for the identification of the model parameters is found in the frequency range beyond the first resonance, a range which was rarely considered in the past.

Fabio Leccese, Michael Magnone
A 3 BITS DISCRETE PURE LINEAR ANALOG PREPROCESSING FOLDING ADC ARCHITECTURE BASED ON CASCADE CONTROLLED CHANNELS

A very simple circuit for a 3-bits discrete pure linear analog preprocessing folding ADC is presented. The device is based on the folding idea: the DAC, the summing node and the amplifier, fundamental elements of the classical architecture, are eliminated and replaced with an analogical signal preprocessing parallel structure named "channels". All channels are connected as a cascade and only three transistors constitute each one. The circuit has been widely analyzed by simulation and its simplicity guarantees easiness of realization, reduction of power consumption and reduction of total conversion time, making it close to the ADC flash. A first discrete circuit it has been realized and tested.

Matteo Parenti, Andrea Boni, Davide Vescovi
A 6-b 1Gsample/s SiGe BiCMOS A/D Converter

The paper describes the design of a 1GS/s 6-bit ADC in SiGe BiCMOS technology. Several techniques such as subranging, interpolation and averaging were implemented on the original flash architecture in order to achieve low power consumption without sacrificing linearity and dynamic performance.

Bruno Da Silva, Stephane Bosse, Severin Barth, Steve Torchinsky
A 6-bit 3GS/s FLASH ADC IN BIPOLAR 0.25 µm FOR THE RADIOTELESCOPE SKA

A flash Analog to Digital Converter (ADC) at 3 Giga samples per second (GS/s) was developed using QUBIC4X which is a 0.25 µm SiGeC process from NXP Semiconductors. The ADC has a bandwidth close to 1.2 GHz with a resolution of 6-bit. The full design employs a differential structure. The ADC uses a parallel architecture consisting of the following components: track and hold, comparators, and a fat tree encoder. An embedded test system will help us to validate the data transmission, and it is made by a Linear Feedback Shift Register (LFSR). An additive scrambler block allowed us to transmit the data without an accompanying clock signal. The core of the digital circuit is in Emitter-Coupled Logic (ECL). The input is adapted to 100 Ω differential, and the outputs use standard Low Voltage Differential Signaling (LVDS). The input voltage range is about 0.5 Volts. The complete system has a power consumption of 2.6 Watts and the Effective Number of Bits (ENOB) is higher than 4.4 at 1490 MHz.

Li Wansheng, Li Qingzhong, Zhao Yucheng, Sun Yunhai, Wang Jianguo
A 60 MN Build-Up Force Transfer System

The paper described principle, construction and main specifications of a 60 MN force transfer system (FTS), which is used to transfer or calibrate large force over 20 MN, and to do inter-comparison of force standards. The paper has raised additional budget of its connecting to uncertainty of the force measured by the FTS, and non-uniformity of force applied on the FTS.

Alberto Ramil, Ana J. López, J. Santiago Pozo-Antonio, Teresa Rivas
A backpropagation ANN algorithm based on RGB images for the identification of granite-forming minerals

Granite is a rock widely used in the built Cultural Heritage in the NW of Iberian Peninsula. Nowadays, one of the most studied cleaning procedure of the built Cultural Heritage is the laser application because it is gradual and selective. Considering the laser cleaning of granite, it is of great interest to perform the identification of the forming-minerals in the stone surface in order to avoid damage due to the overexposure, improving the treatment results. The aim of this work is the optimization of a back propagation artificial neural network in order to obtain rapid and reliable identification of formingminerals in granitic stones by means of RGB images. Our goal is, eventually, in-situ monitor the laser cleaning of granite stoneworks. The artificial neural network results obtained were compared with the results of the modal analysis and it was detected a high degree of correct identification of the minerals.

P. Arpaia,P. Cimmino, E. De Matteis, G. D’Addio
A BALANCE BOARD DEVICE FOR HOME CARE TELEREHABILITATION EXERGAMING

A prototype of a low-cost balance board for exergaming-based tele-rehabilitation systems is introduced. The objective is to extend at patient’s home the interactive nature of the individualized rehabilitation therapies traditionally carried out at clinic. Preliminary results on posturographic tests showed encouraging performance.

Mitsuo Matsuda, Takahiro Arita, Susumu Sakano
A BASIC RESEARCH FOR DISCRIMINATION OF LIVING BODY TISSUES USING TACTILE SENSOR

It is dispensable to develop the discriminating method of the human body tissues for the automation of the operation using robots. The piezoelectric elements are used as the sensor to measure the qualities of the living body. The discrimination for various meats as the living body is tried using the developed tactile sensor. It is shown that the discrimination among the living tissues is possible using the proposed tactile sensor.

Page 6 of 770 Results 51 - 60 of 7695