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European Conference on Microwave

作者： Chan-Wang Park Ammar B. Kouki Fadhel M. Ghannouchi Etienne A. Allamando Institut dE28099Electronique et Microélectonique du Nord Département Hyperfréquences et Semnconducteurs Université des Sciences et Technologies de Lille Cité Scientifique Villeneuve d'Ascq France Department of Electrical and Computer Engineering Ecole Polytechnique de Montreal Montreal Canada

A new reflective-type variable attenuator for PCS applications using a backward-wave quadrature hybrid and four PIN diodes is presented. The proposed configuration uses a single bias line for the four diodes with each two being separated by quarter wavelength transmission line. Simulation and experimental results show that an attenuation range of 14.3 dB with a maximum phase variation of 3° can easily be achieved. The attenuation and group delay exhibit good flatness with a variation of ±0.06 dB in attenuation and ±20 ps in group delay over a 100MHz bandwidth.

关键词： Attenuators Delay Personal communication networks Diodes Impedance Attenuation Transmission lines Bandwidth Application software Control systems

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An overview of robot force control

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ROBOTICA 1997年第5期15卷 473-482页

作者： Zeng, GW Hemami, A Department of Electrical Engineering and Computer Science Ecole Polytechnique de Montreal Montreal Quc CANADA

This paper reports on the existing robot force control algorithms and their composition based on the review of 75 papers on this subject. The objective is to provide a pragmatic exposition with speciality on their differences and different application conditions, and to give, a guide of the existing robot force control algorithms. The previous work can be categorized into discussion, design and/or application of fundamental force control techniques, stability analysis of the various control algorithms, and the advanced methods. Advanced methods combine the fundamental force control techniques with advanced control algorithms such as adaptive, robust and learning control strategies.

关键词： stiffness impedance admittance hybrid force control adaptive control robust control learning algorithm

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Efficient and accurate testing of analog-to-Di using oscillation-test method

Efficient and accurate testing of analog-to-Di using oscilla...

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1997 European Conference on Design and Test, EDTC 1997

作者： Arabi, Karim Kaminska, Bozena Department of Electrical and Computer Engineering Ecole Polytechnique de Montreal P.O.Box 6079 Station Centre-ville MontrealQCH3C3A7 Canada OPMax Engineering PortlandOR United States

ISBN: (纸本)0818677864

This paper describes a practical test approach for analog-to-digital converters (ADCs) based on the oscillation-test strategy. The oscillation-test is applied to convert the ADC under test to an oscillator. The oscillation frequencies are able to monitor the ADC conversion rate, differential nonlinearity (DNL) and integral nonlinearity (INL) at each quantization band edge (QBE). Using this method, no analog stimulus should be supplied and therefore the need for a costly precision signal generator is eliminated. Besides, as the oscillation frequency is evaluated using pure digital circuitry, test accuracy is increased. This test approach is not limited to a special kind of ADC. Simulations and practical implementation prove the efficiency of the proposed test approach for ADCs. © 1997 IEEE.

关键词： Analog to digital conversion

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Synthesis of impedance matching circuits using arbitrary nonuniform transmission lines

Synthesis of impedance matching circuits using arbitrary non...

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Microwave, MTT-S International Symposium

作者： A.H. Hamade A.B. Kouki F.M. Ghannouchi Department of Electrical and Computer Engineering Ecole Polytechnique de Montreal Montreal QUE Canada Polytechnique Montreal Montreal QC CA

An efficient approach for the synthesis of impedance matching circuits using arbitrary nonuniform transmission lines is proposed. The proposed technique is first summarized and its merits are discussed. Several practical examples are then considered and different matching circuits are synthesized covering wide impedance and frequency ranges. The results obtained by the proposed approach are compared to measured data as well as to those obtained by a commercial simulator using a full wave analysis.

关键词： Circuit synthesis Impedance matching Distributed parameter circuits Circuit simulation Transmission line measurements Microwave circuits Frequency Shape Optimization methods Impedance measurement

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Dynamics of a dual-unit articulated vehicle for path tracking control problem formulation

Dynamics of a dual-unit articulated vehicle for path trackin...

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IEEE Conference on Control Technology and Applications (CCTA)

作者： A. Hemami V. Polotski Department of Electrical and Computer Engineering Ecole Polytechnique Montreal QUE Canada

The dynamics of motion of a class of vehicles consisting of two one-axle wheeled units pivoted together are developed for the formulation of the path tracking control problem. This particular type of vehicle is frequently used for ore transportation in underground mines. Steering of this vehicle is performed through changing the angle between the two units by means of an actuator. In this paper the equations governing the motion and the tracking error dynamics in terms of the system inputs, namely the traction forces on the front and rear wheels and the actuator force for changing the angle between the two units, are derived. These equations are nonlinear and highly coupled. However, it may be deduced that from what normally appears in practice and for low operational speeds some acceptable assumptions may be made based upon which the formulation of the control problem and the synthesis of a controller becomes much simpler.

关键词： Vehicle dynamics Vehicles Tracking Actuators Nonlinear equations Motion control Ores Transportation Nonlinear dynamical systems Wheels

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Efficient and accurate testing of analog-to-digital converters using oscillation-test method 97

Efficient and accurate testing of analog-to-digital converte...

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European Design and Test (ED&TC) Conference

作者： K. Arabi B. Kaminska Department of Electrical and Computer Engineering Ecole Polytechnique de Montreal Montreal QUE Canada

ISBN: (纸本)9780818677861

关键词： Analog-digital conversion Circuit testing Quantization Built-in self-test Threshold voltage Oscillators Frequency conversion Monitoring Signal generators Circuit simulation

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Fast extraction of the capacitance matrix of multilayered multiconductor interconnects using the method of lines

Fast extraction of the capacitance matrix of multilayered mu...

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IEEE Conference on Multi-Chip Module

作者： Xiaohong Jiang Ke Wu Wei Hong W.W.-M. Dai Electrical & Computer Engineering Department Ecole Polytechnique de Montreal Montreal Canada Computer Engineering University of California Santa Cruz CA USA

In this paper, the method of lines (MoL) is used to compute the 2-D and 3-D capacitance matrices of multiconductor interconnects with finite metalization thickness that are embedded in conformal multilayered dielectric media. Results show a good agreement with the published data. By contrast, this technique has efficient calculation and flexible handling of conductors having arbitrarily shaped topology.

关键词： Capacitance Integrated circuit interconnections Conductors Laplace equations Transmission line matrix methods Embedded computing Dielectrics Maxwell equations Finite difference methods Magnetic analysis

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Linearization of Microwave Emitters using an Adaptive Digital Predistorter

Linearization of Microwave Emitters using an Adaptive Digita...

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European Conference on Microwave

作者： Ernesto G. Jeckeln Fadhel M. Ghannouchi Mohamad Sawan Department of Electrical and Computer Engineering Ecole Polytechnique de Montrèal Montreal Canada

Adaptive digital predistortion for nonlinear power amplifier (PA) became one of the most robust linearization techniques that can be implemented in digital signal processors (DSP) environment. However, its precision compensation for AM-AM and AM-PM distortion is wasted when the quadrature modulator (QM) impairments are not to be considered. This paper presents a new digital predistorter for microwave emitters with real time modeling of both, PA and QM distortions, that can compensate for nonlinearity, gain imbalance, phase imbalance and DC offset. An improvement of 35 dB of out-of-band power is obtained in simulating with 105 complex input look-up table using 2D interpolation.

关键词： Nonlinear distortion Predistortion Power amplifiers Robustness Linearization techniques Digital signal processors Digital signal processing Phase distortion Table lookup Interpolation

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On the application of very low rate error control coding to CDMA

On the application of very low rate error control coding to ...

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Canadian Conference on Electrical and computer engineering (CCECE)

作者： D. Haccoun Z. Gherbi Department of Electrical and Computer Engineering Ecole Polytechnique de Montrèal Montreal QC Canada

In code division multiple access (CDMA), the bandwidth of the transmitted signal is spread over a much larger bandwidth than that of the baseband signal yielding the so-called processing gain of the spread spectrum system. This spectrum spreading is usually performed using a pseudo-random (PN) sequence, but random coding analysis has indicated that bandwidth spreading using very low rate error correcting codes may lead to a larger system capacity over spreading based on PN sequence only. Hence a low rate convolutional code or combination of a low rate code and a spreading sequence could be used to improve the CDMA system capacity. We present an analysis of the CDMA capacity for the reverse, or uplink channel, from the mobile user to the base station. Using a constant overall bandwidth expansion, for a given target bit error probability we obtain the best sharing of the CDMA bandwidth between the error correcting code and the PN sequence. We can therefore evaluate the improvement in system capacity that can be obtained over more traditional CDMA systems where almost all the bandwidth expansion is due to the PN sequence spreading only.

关键词： Error correction Multiaccess communication Bandwidth Signal processing Error correction codes Baseband Spread spectrum communication Performance analysis Convolutional codes Base stations

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Programmable high-amplitude balanced stimulus current-source for implantable microstimulators

Programmable high-amplitude balanced stimulus current-source...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： S. Bourret M. Sawan R. Plamondon Department of Electrical and Computer Engineering Ècole Polytechnique de Montréal Montreal QUE Canada

In this paper, a 5 bit programmable current-source dedicated to implantable microstimulators is presented. Generating a maximum current of 4 mA through a 1 K/spl Omega/ load, it takes advantage of the BiCMOS 0.8 /spl mu/m technology which allows high current-level output-stage. It occupies a silicium area smaller than 0.026 mm/sup 2/. Simulation results showed good linearity and low power consumption. Its architecture allows the generation of bi-directional current pulses and features an almost null DC offset. Finally, the proposed current-source can be easily modified to output a smaller current range, enabling greater precision and giving the possibility to stimulate nerves with higher impedances.

关键词： Linearity Energy consumption Impedance Clocks BiCMOS integrated circuits DC generators Pulse generation Spinal cord Arm Leg

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