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Sign Haar Transform

Sign Haar Transform

引用

ieee International symposium on circuits and systems (ISCAS)

作者： B.J. Falkowski S. Rahardja School of Electrical & Electronic Engineering Nanyang Technological University Singapore

A non-linear transform, called "Sign Haar Transform" has been introduced. The transform is unique and converts binary/ternary vectors into ternary spectral domain. Recursive definitions and Fast Transforms for the calculation of Sign Haar Transform have been developed. The new transform is extremely computationally effective both in terms of memory requirements and processing time.< >

关键词： Boolean functions Network synthesis Logic design Logic testing Circuit testing Transforms Nonlinear filters Multiplexing Flow graphs Application software

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Synthesis of fixed-point low roundoff noise digital filters with no limit cycle

Synthesis of fixed-point low roundoff noise digital filters ...

引用

ieee International symposium on circuits and systems (ISCAS)

作者： M.F. Fahmy G.A. Raheem Department of Electrical & Electronic Engineering Assiut University Egypt

A simple method is described for the design of scaled fixed-point limit-cycle free, recursive digital filters with low roundoff noise. The method is based on reducing to zero as much as possible of the entries of the filter's state matrices. An optimization procedure is developed to get the optimum value of a linear transformation that minimizes the total output noise power, while keeping the norm of the state matrix A bounded to unity. Illustrative examples are also given to show the simplicity and efficiency of the proposed method.< >

关键词： Digital filters Limit-cycles State-space methods IIR filters design engineering Fixed-point arithmetic Sufficient conditions White noise Quantization

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A new set of complementary subband filters with sharp band characteristics

A new set of complementary subband filters with sharp band c...

引用

ieee International symposium on circuits and systems (ISCAS)

作者： S.R. Pillai G.H. Allen Department of Electrical Engineering James Cook University Townsville QLD Australia

A new set of complementary subband filters with sharp band characteristics is proposed and the general design procedure is illustrated here. The proposed scheme is shown to have sharper frequency band characteristics compared to the ordinary complementary filters. These filters have a wide range of applications in subband coding for audio and video. A new method is outlined to obtain the class of filters that satisfy the higher order complementary condition for an arbitrary number of channels. This new design procedure can also be used to to generate ordinary multichannel magnitude and power complementary filters with sharper band responses.< >

关键词： Polynomials Frequency Power filters Equations IIR filters electronic mail Power generation Signal processing Stability Hydrogen

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On the design of a jitter-tolerant synchronisation subsystem for optical fibre PPM

On the design of a jitter-tolerant synchronisation subsystem...

引用

ieee International symposium on circuits and systems (ISCAS)

作者： J.M.H. Elmirghani R.A. Cryan Centre for Communication Networks Research Department of Electrical & Electronic Engineering Manchester Metropolitan University UK

An optimum pre-synchronisation filtering strategy is proposed and analysed in the context of optical fibre pulse position modulation (PPM). Under Ideal synchronisation, the PPM system is shown to outperform the equivalent PCM system sensitivity. The PPM system performance penalty due to jitter is evaluated and an original expression is presented for the jittered PPM format power spectral density (PSD). The performance improvement obtained by using the proposed filtering is ascertained and the system parameters are specified for optimum performance.< >

关键词： Optical design Optical fibers Optical pulses Phase change materials Timing Pulse modulation Optical filters Optical receivers Optical pulse shaping Optical fiber filters

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An integrated fully-differential switched-current ladder filter

An integrated fully-differential switched-current ladder fil...

引用

ieee International symposium on circuits and systems (ISCAS)

作者： K. Halonen K. Koli J. Wallinheimo H. Kimppa Electronic Circuit Design Laboratory Helsinki University of Technology Espoo Finland

A fast fully-differential 6th order switched-current ladder filter with transmission zeros has been designed with a 1.2 um CMOS-process. The low-pass cut-off frequency of the filter is 630 kHz and it has a transmission zero at 950 kHz. The used clock frequency is 10 MHz. The filter is constructed with a novel fully-differential SI-integrator. The chip includes the voltage-to-current and the output current-to-voltage converters. The performance-of the SI-filter is compared with the equivalent SC-realization.< >

关键词： Filters Clocks Switches Switching circuits Frequency Capacitors Joining processes Filtering theory Voltage Circuit synthesis

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101 ways to make a circuit fail

101 ways to make a circuit fail

引用

ieee International symposium on circuits and systems (ISCAS)

作者： C. Toumazou J. Bryant P.E. Allen D.F. Bowers B. Gilbert A. Brombacher Department of Electrical and Electronic Engineering Imperial College London London UK Analog Devices Inc. Newbury UK Georgia Tech GA USA Analog Devices Inc.orporated Santa Clara USA Analog Devices Inc. Beaverton OR USA Philips CE Netherlands

A circuit design, whether on first silicon, breadboarded or PCB's will quite often fail to work first time and getting it to work is costly time-consuming, irritating and sometimes very frustrating. If the failure is inevitable, then why are more precautions not taken at the earlier stages of design? What are these mystical failure mechanisms? Human errors, simulation errors, testing errors? etc. The authors attempt to answer some of these questions.< >

关键词： Analog circuits Content addressable storage Circuit testing Circuit synthesis Silicon Circuit simulation Educational institutions Signal Processing Society Failure analysis Humans

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Almost distortion-free IIR subband filters using a nested structure

Almost distortion-free IIR subband filters using a nested st...

引用

ieee International symposium on circuits and systems (ISCAS)

作者： S.R. Pillai G.H. Allen Department of Electrical Engineering James Cook University QLD Australia

In this paper almost-perfect reconstruction techniques for m-channel multirate systems are investigated. It is shown here that using two allpass filters it is possible to generate a three channel filter bank that eliminates various errors caused by the analysis/synthesis system. In particular, a technique to cancel alias and magnitude distortion is outlined here. It is also shown that the classical two channel synthesis filter is a special case of the proposed synthesis filter bank selection procedure. Illustrative example and design algorithms are included to supplement the theory.< >

关键词： IIR filters Filter bank Band pass filters Channel bank filters Signal analysis Transfer functions Distortion Signal processing algorithms Quantization electronic mail

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design of limit-cycle-free recursive transfer functions for fixed-point direct form implementation

Design of limit-cycle-free recursive transfer functions for ...

引用

ieee International symposium on circuits and systems (ISCAS)

作者： T.I. Laakso M. Lang T. Saramaki Nokia Research Center Helsinki Finland Electrical and Computer Engineering Department Rice University TX USA Signal Processing Laboratory Tampere University of Technology Tampere Finland

An approach for the design of limit-cycle-free digital fixed-point filters is proposed. By constraining the transfer function already in the design phase, it is guaranteed that the filter will be free from limit cycles and overflow oscillations in the direct form implementation. The design strategy also guarantees low roundoff noise. The proposed approach is illustrated with design examples. The examples show that typically a 50-100% increase in the filter order (as compared to standard elliptic design) is needed for the limit-cycle-free implementation of a lowpass filter with the direct form (DF) structure. Since the DF structure is very efficient to implement in signal processors, the proposed filters are very attractive for such environment, whereas dedicated filter structures (wave digital, state-space, etc.) easily result in a 3 to 4-fold implementation complexity.< >

关键词： Transfer functions Limit-cycles electronic mail Digital filters Stability criteria Algorithm design and analysis design engineering Laboratories Elliptic design Signal processing

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Allocation of multiport memories in ASIC data path synthesis

Allocation of multiport memories in ASIC data path synthesis

引用

ieee International symposium on circuits and systems (ISCAS)

作者： Kwangsoo Seo Jeongyop Lee Moonkey Lee Department of Electronic Engineering Yonsei University Seoul South Korea

At present, datapath synthesis techniques produce a design with a large number of isolated registers. Allocation of memory modules to implement these resisters are usually left to the designer. This paper presents new approach to the allocation of multiport memories which minimizes hardware costs in ASIC datapath synthesis. The proposed approach, AMD, considers not only the access requirements of registers but also the lifetime of registers. The objective is to minimize the requirement of registers and multiport memory modules under a given resource constraints simultaneously. The minimization problem has been modeled as a 0-1 integer linear programming problem. This approach is illustrated with an example.< >

关键词： Application specific integrated circuits Registers Random access memory Read-write memory Digital signal processing chips Multidimensional systems Hardware Costs Integer linear programming Space exploration

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On design of analogue multipliers using gallium arsenide MESFETs

On design of analogue multipliers using gallium arsenide MES...

引用

ieee International symposium on circuits and systems (ISCAS)

作者： R. Lecouls D.G. Haigh P.M. Radmore D.R. Webster Department of Electronic and Electrical Engineering University College London UK

A previous method of synthesis for transconductor and multiplier-functions using Gallium Arsenide (GaAs) MESFETs modelled by a square-law drain current versus gate-source voltage-(V/sub gs/) characteristic is extended to the case of a general power law device characteristic and applied to the multiplier case. Compensation for the effect of device output conductance, modelled as a V/sub ds/-to-V/sub gs/ electrostatic feedback effect, is considered and results are shown by simulation examples.< >

关键词： Gallium arsenide MESFETs FETs Voltage Circuit synthesis Transconductance Power engineering and energy Educational institutions Optical wavelength conversion DH-HEMTs

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