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A direct digitally delay generator

A direct digitally delay generator

引用

International Conference on Semiconductor

作者： D.E. Calbaza Y. Savaria Department of Electrical & Computer Engineering Ecole Polytechnique de Montreal Montreal QUE Canada

The development of communication systems in the past years has increased the necessity to synthesize very accurate clocks, having large frequencies and very low jitter. In the same large numbers expresses the divide ratios between the frequencies of the clocks that we have to synchronize. This paper presents a new type of circuit named Direct Digitally Delay Generator (DDDG), able to synthesize frequencies up to 1 GHz with a jitter below 200 ps.

关键词： Delay Clocks Circuit synthesis Jitter CMOS technology Filters Frequency synthesizers Frequency synchronization HDTV Signal resolution

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On the search for self-doubly orthogonal codes

On the search for self-doubly orthogonal codes

引用

IEEE International Symposium on Information Theory

作者： B. Baechler D. Haccoun F. Gagnon Department of electrical and computer Engineering Ecole Polytechnique de Montreal Montreal Canada Polytechnique Montreal Montreal QC CA Department of electrical and Engineering Ecole of Technologie Supérieure Montreal Canada

In this paper we present the search and determination of a subset of orthogonal convolutional codes called convolutional self doubly orthogonal codes (CSO/sup 2/C). These codes may be advantageously utilised for the novel coding/iterative decoding technique introduced as an important amelioration of turbo codes. For this technique the code constraint length corresponds to the latency of each decoding iteration. Hence, an important parameter in the code searching is the minimisation of the code constraint length for a given error correcting capability.

关键词： Convolutional codes Turbo codes Iterative decoding Iterative algorithms Delay Error correction codes Galois fields Geometry Automatic testing Electrical engineering

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CMOS wide-swing differential VCO for fully integrated fast PLL

CMOS wide-swing differential VCO for fully integrated fast P...

引用

Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Y. Fouzar M. Sawan Y. Savaria Department of Electicaal nd Computer Engineering Hole Polytechnique de Montreal Montreal QUE Canada

Presents a fully integrated CMOS fast phase locked loop (PLL), based on a new wide swing differential voltage controlled oscillator (WSDVCO). The proposed PLL incorporates new simple architecture of well known PLL building blocks (a dynamic phase-frequency detector, a charge pump, an on-chip low-pass filter, a WSDVCO and a frequency divider). The present version of the WSDVCO allows one to obtain wide tuning range of 40 to 730 MHz simulated with Spectre simulator using 0.25 /spl mu/m CMOS technology. The simplicity of the proposed PLL building blocks permits one to design high performance PLL.

关键词： Voltage-controlled oscillators Phase locked loops Phase frequency detector Capacitors Voltage Mirrors Phase detection Charge pumps Low pass filters Frequency conversion

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A Ku band digitally controlled RF predistorter suitable for power amplifiers operating in different traffic and power back-off conditions

A Ku band digitally controlled RF predistorter suitable for ...

引用

2000 30th European Microwave Conference, EuMC 2000

作者： Touimer, S. Beauregard, F. Ghannouchi, F.M. AmpliX Wireless and Satcom 3333 Queen Mary Montreal QC H3V 1A2 Canada Electrical and Computer Engineering Department Ecole Polytechnique Montreal Station Centre-Ville P.O. Box 6079 Montreal QC Canada

This paper presents a digitally controlled RF predistorter suitable for power amplifiers operating in different traffic and load conditions. The developed digital controlled RF predistorter has enough control parameters and wide tunable complex gain range to make it adaptive and suitable to different type of power amplifiers such as TWTAs and SSPAs and stimulus. A Ku band prototype was designed, built and tested with 20 Watt TWTA and satisfactory results were obtained. Though the digital controller, the RF predistorter can be optimized for any given power back off operating point, stimulus signal, and temperature conditions. © 2000 IEEE.

关键词： Power amplifiers

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C/C++ conditional compilation analysis using symbolic execution

C/C++ conditional compilation analysis using symbolic execut...

引用

International Conference on software Maintenance (ICSM)

作者： Ying Hu Merlo Dagenais Lague Department of Electrical and Computer Engineering Ecole Polytechnique de Montreal Montreal QUE Canada Polytechnique Montreal Montreal QC CA Quality Engineering and Research Group Bell Canada Limited Montreal QUE Canada

Conditional compilation is one of the most powerful parts of a C/C++ environment available for building software for different platforms with different feature sets. Although conditional compilation is powerful, it can be difficult to understand and is error-prone. In large software systems, file inclusion, conditional compilation and macro substitution are closely related and are often largely interleaved. Without adequate tools, understanding complex header files is a tedious task. This practice may even be complicated as the hierarchies of header files grow with projects. This paper presents our experiences of studying conditional compilation based on the symbolic execution of preprocessing directives. Our two concrete goals are: for any given preprocessor directive or C/C++ source code line, finding the simplest sufficient condition to reach/compile it, and finding the full condition to reach/compile that code line. Two different strategies were used to achieve these two goals. A series of experiments conducted on the Linux kernel are presented.

关键词： C language

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Multi-teriminal UPFC for power system deregulation

Multi-teriminal UPFC for power system deregulation

引用

IEEE Winter Meeting Power engineering Society

作者： B. Mwinywiwa B. Lu B.T. Ooi F.D. Galiana D. McGillis R. Marceau G. Joos Department of Electrical and Computer Engineering University of Dares Salaam Dar es Salaam Tanzania Department of Electrical and Computer Engineering McGill University Montreal QUE Canada Department of Electrical and Computer Engineering I'Polytechnique de Montreal Montreal QUE Canada Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

One original purpose of FACTS controllers is to increase the transmission capacity of existing lines thus deferring the necessity of building new lines. FACTS, such as the unified power flow controller (UPFC), have also been regarded as controllers for routing power in the market-driven, deregulated power systems. Hitherto, the UPFC has been conceived to control the complex powers through a radial line. This paper presents the concept of a multi-terminal UPFC (M-UPFC), which serves to control the complex powers of several transmission lines converging towards (or radiating from) a transmission node. In order to show that a M-UPFC can be built, that it has stable operation and that it has all the control degrees of freedom of UPFCs, a laboratory model based on 3 units of 3-phase, voltage-source converters has been assembled and tested.

关键词： Power systems Control systems Voltage control Pricing Load flow Capacitors Power transmission lines Electricity supply industry deregulation Investments Energy conversion

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CMOS front-end amplifier dedicated to monitor very low amplitude signal from implantable sensors

CMOS front-end amplifier dedicated to monitor very low ampli...

引用

Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Yamu Hu M. Sawan Department of Electrical and Computer Engineering Ecole Polytechnique de Montrèal Montreal QUE Canada

Describes a low-noise, low-power and low-voltage amplifier dedicated to very low amplitude signal acquisition from implantable electronic devices. Low noise and low DC offset are realized by means of chopper stabilization (CHS) technique. In addition, due to adding a rail to rail input stage, low power supply (1.8V) and wide common mode input range (0-1.8V) are achieved. It features a gain of 51dB and a bandwidth of 4.5 kHz. The equivalent input noise is about 56nv//spl radic/(Hz).

关键词： Monitoring Choppers Noise level Low-noise amplifiers Bandwidth Frequency Voltage Rail to rail inputs Power supplies Biomedical measurements

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New CMOS integrated pulse width modulator for voltage conversion applications

New CMOS integrated pulse width modulator for voltage conver...

引用

IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： A. Djemouai M. Sawan M. Slamani Department of Electrical and Computer Engineering Ecole Polytechnique de Montreal Montreal QUE Canada Universite de Quebec Montreal Canada

ISBN: (纸本)0780365429

We propose in this paper a new architecture of a CMOS integrated pulse width modulator (PWM) used to control the duty-cycle of square waveforms. The architecture of the proposed PWM is based mainly on an improved voltage controlled-delay line (VCDL) which requires a very small integrated area. The first version of this PWM allows duty-cycle control range of 0% to 50%, and the second version with duty-cycle control this range from 0% to 100%. The two versions of the proposed PWM are dedicated for the control of the power level of switching power amplifiers and are suitable for integrated DC-DC voltage conversion applications. Hspice simulation results show that the proposed PWM is able to achieve a large duty-cycle control range with high resolution.

关键词： Pulse width modulation Space vector pulse width modulation Circuits Pulse amplifiers Frequency Voltage control Delay Digital modulation Signal resolution Application software

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An error performance analysis of iterative threshold decoding

An error performance analysis of iterative threshold decodin...

引用

IEEE International Symposium on Information Theory

作者： C. Cardinal D. Haccoun F. Gagnon Department of electrical and computer Engineering Ecole Polytechnique de Montreal Montreal QUE Canada Department of electrical Engineering Ecole de Technologie Supérieure Montreal QUE Canada

A method for analyzing the error performance of the iterative threshold decoder using strict sense multiorthogonal convolutional codes where the multiplicity order is larger or equal to the number of iterations is presented. This allows a tractable analysis, since all random variables are considered independent at each decoding step. The analysis provides a good prediction of the error probability convergence value of the iterative decoding process using strict sense doubly orthogonal convolutional codes.

关键词： Performance analysis Iterative decoding Convolutional codes Random variables Interleaved codes Parity check codes Equations computer errors Error analysis Iterative methods

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Adaptive baseband/RF predistorter for power amplifiers through instantaneous AM-AM and AM-PM characterization using digital receivers

Adaptive baseband/RF predistorter for power amplifiers throu...

引用

Microwave, MTT-S International Symposium

作者： E.G. Jeckeln F. Beauregard M.A. Sawan F.M. Ghannouchi Department of Electrical and Computer Engineering Ecole Polytechnique de Montrèal Montreal QUE Canada

This paper presents a powerful adaptive based band/RF predistorter, which uses advantageously the concept of digital receiver technology into power amplifier (PA) linearization area. The linearizer performs an instantaneous characterization of the PA using two digital receivers to supply its AM-AM and AM-PM transfer functions. W-CDMA signals applying different stress levels on PA are used to evaluate the performance of the predistorter. The entire system is validated using DSP/RF co-simulation for a typical class AB power amplifier. Results from different cases of standards signals reveal a significant reduction in effective output power back off (OBO).

关键词： Baseband Radio frequency Power amplifiers Radiofrequency amplifiers Predistortion RF signals Multiaccess communication Power generation Radio transmitters Linearity

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