Circuits and Systems, 1994. APCCAS '94., 1994 IEEE Asia-Pacific Conference on

5-8 Dec. 1994

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  • Proceedings of APCCAS'94 - 1994 Asia Pacific Conference on Circuits and Systems

    Publication Year: 1994
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    Freely Available from IEEE
  • Technologies for personal communications

    Publication Year: 1994
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (39 KB)

    Summary form only given, as follows. Portability of services is one of the key elements of personal communications since it will enable us to communicate with everyone, anytime and anywhere. Mobile communications are reviewed in conjunction with radio and network technologies. The most important and often overlooked condition-customer requirements-is discussed by comparing the cordless phone and c... View full abstract»

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  • Audio visual coding technologies and LSI circuits based on MPEG2 standard to implement multimedia services

    Publication Year: 1994
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (34 KB)

    Summary form only given, as follows. Standardization of MPEG2 has been almost completed and it is expected to be the most important technology for fascination multimedia services in telecommunication, broadcasting and interdisciplinary services areas. The MPEG2 coding algorithm for video and audio signals is outlined and the main features of the MPEG2 standard are presented. The LSI technology req... View full abstract»

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  • Artificial neural networks-learning and generalization

    Publication Year: 1994
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (75 KB)

    Summary form only given. This presentation is intended to address issues that are related to learning and generalization capability of ANN. It is also intended to examine the state-of-the-art and, hopefully, stimulate discussions on where research should be directed. A survey on recent developments in supervised and unsupervised learning is given. Details of both learning strategies are elaborated... View full abstract»

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  • Modeling, simulation and layout synthesis for giga scale CMOS VLSI

    Publication Year: 1994
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (57 KB)

    Summary form only given, as follows. With continuing proliferation of CMOS technology, we are approaching the era of giga-scale VLSI integration with lower power requirement. It would not be surprising to any member of the VLSI community that the validity of many CAD models become obsolete in the deep submicron technology. Also, the required chip complexity increases faster than what designers can... View full abstract»

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  • Author index

    Publication Year: 1994
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    Freely Available from IEEE
  • Coverage area prediction for HDTV

    Publication Year: 1994, Page(s):61 - 66
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    A coverage area prediction method developed in TL (Telecommunication Laboratories) is introduced. The program uses a simple method to predict the signal interference and coverage area automatically and quickly. This technique helps us to re-allocate the site and frequency of radio stations efficiently, especially useful for the advent of HDTV View full abstract»

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  • LAKE: a performance-driven analog CMOS cell layout generator

    Publication Year: 1994, Page(s):564 - 569
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    LAKE is an automatic layout generator that lays out CMOS analog integrated circuits subject to circuit layout constraints such as: matching, symmetry, signal coupling cell aspect ratio (or cell height), and specified cell input/output pin locations. Unlike most previous works, LAKE focuses on effective rules and methods that suit any type of CMOS analog circuit to be incorporated in an application... View full abstract»

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  • A new service for digital mobile communications

    Publication Year: 1994, Page(s):56 - 60
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    We propose a new service for digital mobile communication systems which enables two or more users to hold a secure conference. Two requirements must be considered: privacy and authentication. Privacy is to ensure that an eavesdropper cannot intercept conversations. Authentication ensures that the service is not obtained fraudulently in order to avoid charge for usage. We present a new conference k... View full abstract»

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  • Design techniques for high performance asynchronous arithmetic operators

    Publication Year: 1994, Page(s):127 - 132
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    High performance asynchronous arithmetic operator design techniques are proposed, which adopt some of the techniques commonly used in synchronous systems such as fast precharged logic and efficient latch design, while maintaining the features of localized and elastic pipelining control inherent in asynchronous design. A pipelined sixteen bit multiplier designed using these techniques is presented ... View full abstract»

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  • Symmetric properties of 2-D sequences and their applications for designing quadrantally symmetric linear-phase 2-D FIR digital filters

    Publication Year: 1994, Page(s):436 - 440
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    In this paper, various symmetric and antisymmetric 2-D sequences are used to design quadrantally symmetric/antisymmetric 2-D filters. It is shown that there are sixteen types cases to be considered according to the symmetry/antisymmetry of 2-D sequences in both directions and their filter lengths (even or odd) View full abstract»

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  • A versatile current-mode biquad using operational amplifiers

    Publication Year: 1994, Page(s):591 - 596
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    A versatile current-mode biquad filter using three operational amplifiers and 9 passive elements is proposed. By the suitable choice of the output branch, lowpass, bandpass, highpass, bandstop and allpass transfer functions are realized simultaneously without changing the circuit configuration and elements. Two circuits, one is for low frequency application and the other for high frequency, are pr... View full abstract»

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  • Cost-effective ML trellis decoder for video distribution and high speed communication links

    Publication Year: 1994, Page(s):346 - 351
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    Trellis codes and rate-k/n convolutional codes are often used in wired communications, terrestrial radio and satellite radio links for bandwidth efficiency. To further increase data rates and coding gain, higher rate codes with more states can be used. Cost effectiveness of decoders for these complex rate-k/n and trellis codes becomes a major issue. While cost effective decoder architectures for r... View full abstract»

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  • The radix-2k Viterbi decoding with transpose path metric processor

    Publication Year: 1994, Page(s):194 - 199
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    In this paper, we present a radix-2k Viterbi decoding with Transpose Path Metric (TPM) processor. The TPM processor can provide a permutation function for state rearrangement with simple local interconnection. For interconnection realization, the routing complexity is less than that of the delay-commutator reported previously. In addition, a higher memory length Viterbi processor can be... View full abstract»

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  • A practical all-path timing-driven place and route design system

    Publication Year: 1994, Page(s):560 - 563
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    We have developed a practical timing-driven design system that achieves 17% cycle time improvement with only up to 32% run time penalty, and as low as 1% area overhead in real, 5000-7000-cell designs. This system is based on a Slack Graph concept that efficiently and effectively represents all-path timing constraints and allows optimal trade-off between timing and die size View full abstract»

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  • Layout design considerations in MOS continuous-time integrated filters

    Publication Year: 1994, Page(s):300 - 305
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Analysis of two layout designs used in the realization of MOS continuous-time integrated filters is presented. The effect of MOS parasitic capacitances is thoroughly studied and compared in the two layout design techniques. It is found that one layout method performs well at high frequencies or high Q, at the expense of increased harmonic distortion in comparison with the other method. A tradeoff ... View full abstract»

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  • Dynamic channel assignment with reuse partitioning in cellular radio systems

    Publication Year: 1994, Page(s):51 - 55
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    Popular reuse partitioning systems with fixed channel assignment in cellular systems are effective to improve the channel utilization in space. This paper explores an application of the reuse partitioning scheme, in which the dynamic channel assignment technique is introduced. In the proposed strategy, a channel can be simultaneously assigned to both the inner cells and the outer cells by reducing... View full abstract»

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  • Design of a low power 54×54 bit multiplier based on an intelligent window detector

    Publication Year: 1994, Page(s):121 - 126
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    In this paper, a design methodology of a low power 54×54 bit multiplier based on a Window Detector is proposed. This multiplier is composed of a parallel structured architecture with the encoder block to implement the Modified Booth's algorithm, a block to implement the data compression, and a 108-bit Carry Look-Ahead (CLA) adder. The key idea is the design of a Window Detector which impleme... View full abstract»

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  • An efficient technique for the design of 2-D recursive digital filters with guaranteed stability

    Publication Year: 1994, Page(s):430 - 435
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    A technique is developed for designing two-dimensional (2-D) recursive digital filters with guaranteed stability. The filter is described by a 2-D rational transfer function which corresponds to a linear difference equation with either rectangular or triangular input and output masks. In the case of rectangular (triangular) input and output masks, the denominator polynomial is derived from the sta... View full abstract»

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  • Chip fabrication services for universities in North America and Europe

    Publication Year: 1994, Page(s):532 - 535
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    This paper reviews the chip fabrication services for universities in North America and European countries. One feature of these services is the adoption of a chip fabrication system (called Multiproject Chip) that makes it possible for users at universities to fabricate chips at an extremely low cost. The key idea of the multiproject chip system is that sharing a chip or a wafer among several proj... View full abstract»

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  • Nonlinear gradient-based edge detection algorithms in the telesign system

    Publication Year: 1994, Page(s):661 - 666
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    Edges characterize object boundaries, and an edge point can be thought of as the pixel location of abrupt gray-level changes. Most edge detection algorithms are based on generation of gradient images and thresholding of gradient images. There are two problems in detecting edges of a video sequence in a telesign system. One is that the linear gradient does not match Weber's law, and the other is di... View full abstract»

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  • A current-feedback transconductance amplifier for high-frequency filtering

    Publication Year: 1994, Page(s):587 - 590
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    This paper presents the derivation and analysis for a novel CMOS transconductance amplifier circuit. The structure combines previously developed current-feedback and linearized gm circuits. By properly biasing MOS transistors, improvements in linearity as well as current-to-transconductance efficiency are verified. Analytical and simulation results have shown the newly derived structure is suitabl... View full abstract»

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  • Optimized secondary path modeling technique for active noise control systems

    Publication Year: 1994, Page(s):370 - 375
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    This paper presents a secondary path modeling technique for active noise control (ANC) systems. The optimum delay for the adaptive prediction error filter to reduce the interference in system modeling is derived. This delay is determined by the length of the impulse response of the secondary path to be modeled. The modeling technique developed in this paper can be applied for both on-line and off-... View full abstract»

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  • Spatial domain forward-backward predictor with second-order statistics for bearing estimation

    Publication Year: 1994, Page(s):394 - 399
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    This paper deals with the problem of bearing estimation for narrow-band sources buried in additive white/colored Gaussian noises where the signal-to-noise ratio of interest is relatively small. To circumvent this problem, the MFBLP method with second-order statistics of linear array data is presented, and is referred to as the MFBLP-SOS method. Under the assumption that the additive noise is white... View full abstract»

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  • A very fast three-mode retiming PLL with low jitter and wide operating margin

    Publication Year: 1994, Page(s):340 - 345
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The proposed PLL realizes a fast and wide-ranging pull-in, and a stable locked condition by controlling a frequency difference detector and a PLL core with a dual loop constants in three modes. Simulations of the PLL designed with an 0.8 μm bipolar devices and experiments using a PLL-IC together with PLAs demonstrated the features; a short pull-in time comparable to SAW filters even for 63 bit ... View full abstract»

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