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Circuits and Systems, IEEE Transactions on

Issue 6 • Date June 1987

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Displaying Results 1 - 14 of 14
  • Methods for extracting parameters and modeling integrated interconnections and devices from mask descriptions

    Publication Year: 1987 , Page(s): 701
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  • A look-up table VLSI design methodology for RNS structures used in DSP applications

    Publication Year: 1987 , Page(s): 604 - 616
    Cited by:  Papers (27)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1368 KB)  

    In current high-speed digital signal-processing (DSP) architectures, the Residue Number System (RNS) has an important role to play. RNS implementations have a highly modular structure, and are not dependent upon large binary arithmetic elements. RNS implementations become more attractive when combined with the advantages offered by VLSI fabrication technology. In this paper, a novel design methodology has been developed for RNS structures, based on using look-up tables, which takes into consideration the unique features and requirements of RNS. The paper discusses the following three phases: 1) developing a look-up table layout model, which is used to derive relationships between the size of each modulus and both chip area and time; this model supports all types of moduli; 2) selecting the most efficient layout according to the design requirements; the procedure allows the designer to control the area, time, or the configuration of the memory module required for implementing a modulo look-up table; 3) proposing a set of multi-look-up table modules, to be used as building block units for implementing digital signal-processing architectures. The paper uses two examples to -illustrate the use of the modules in phase 3). View full abstract»

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  • Excess phase jitter cancellation method for SC relaxation oscillators

    Publication Year: 1987 , Page(s): 695 - 700
    Cited by:  Papers (3)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (688 KB)  

    A practical jitter cancellation method for relaxation SC oscillators is presented. Two versatile switched-capacitor (SC) oscillators using the proposed excess phase jitter suppression technique are described. The jitter and the dependence of the oscillation frequency on the saturation voltages of operational amplifiers (op-amp) or comparators are eliminated. Therefore, there is no oscillation frequency limitation, except the one determined by the Nyquist rate. Because the frequency of oscillation of the proposed SC oscillators depends on a capacitor ratio and a reference voltage, the oscillators have excellent stability and accuracy. Experimental results showed good agreement with theoretical ones. View full abstract»

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  • The stochastic process of transitions between limit cycles for a special class of self-oscillators under random perturbations

    Publication Year: 1987 , Page(s): 691 - 695
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (568 KB)  

    A plenary investigation of the stochastic transitions between neighborhoods of limit cycles in a randomly perturbed special class of oscillatory circuits is presented. The very possibility of the realization of self-oscillators with a given set of several limit cycles .was established in the recent works of the authors. On this ground, a simple analysis of the associated diffusion process and its properties are given. View full abstract»

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  • An analysis of nonlinear behavior in delta - sigma modulators

    Publication Year: 1987 , Page(s): 593 - 603
    Cited by:  Papers (132)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1120 KB)  

    This paper introduces a new method of analysis for deltasigma modulators based on modeling the nonlinear quantizer with a linearized gain, obtained by minimizing a mean-square-error criterion [7], followed by an additive noise source representing distortion components. In the paper, input signal amplitude dependencies of delta-sigma modulator stability and signal-to-noise ratio are analyzed. It is shown that due to the nonlinearity of the quantizer, the signal-to-noise ratio of the modulator may decrease as the input amplitude increases prior to saturation. Also, a stable third-order delta-sigma modulator may become unstable by increasing the input amplitude beyond a certain threshold. Both of these phenomena are explained by the nonlinear analysis of this paper. The analysis is carried out for both dc and sinusoidal excitations. View full abstract»

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  • The necessary and sufficient conditions for minimum roundoff noise in second-order state-space digital filters and their optimal synthesis

    Publication Year: 1987 , Page(s): 669 - 677
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (888 KB)  

    For second-order state-space digital filters, new expressions for the covariance matrix K and the unit noise matrix W are derived. Using these, the necessary and sufficient conditions for minimum roundoff noise in scaled filters are given in terms of the state parameters. Simple expressions for the second-order modes of the filter and for the attainable lower bound of the unit noise gain are provided. The scaled state realizations having minimum roundoff noise are evaluated for all types of digital filter transfer functions using only their coefficients. View full abstract»

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  • Generalized approach to sampling rate alteration in wave digital filters

    Publication Year: 1987 , Page(s): 678 - 686
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (944 KB)  

    Generalized arrangements (wave-flow diagrams) for sampling rate alteration in wave digital filters (WDFs) are proposed and analyzed. By this new approach, the number of degrees of freedom of the resulting so-called multirate WDF is not reduced in relation to that of the reference circuit. Advantages of the earlier multirate WDF's, such as improved loss performake for a given filter structure, increased dynamic range, and low passband sensitivity for coefficients, are preserved. Necessary and sufficient realiiability conditions for the generalized multirate WDF's are also presented. It is assumed that the reference filter is lossless, reciprocal, and rational in its complex frequency 4. An example of a fifth-order WDF for sampling rate increase is given. View full abstract»

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  • On lossless transfer functions and orthogonal realizations

    Publication Year: 1987 , Page(s): 677 - 678
    Cited by:  Papers (7)
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    In this paper, a simple and direct algebraic proof is given to show that a rational m \times n (m \geq n) lossless transfer function has an orthogonal realization. The proof exploits two interesting properties of the impulse response of a lossless transfer function. View full abstract»

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  • Parameterized linear systems and linearization families for nonlinear systems

    Publication Year: 1987 , Page(s): 650 - 657
    Cited by:  Papers (26)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (840 KB)  

    The question of characterizing parameterized linear systems that can arise as linearization families of a nonlinear system about a family of constant operating points is addressed. The parameterization can be in terms of operating-point inputs or operating-point outputs. For both parameterized linear state equations and parameterized transfer functions, existence conditions, and constructions, for a corresponding nonlinear system are presented. View full abstract»

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  • A new method for the analysis and design of the class E power amplifier taking into account the Q_L factor

    Publication Year: 1987 , Page(s): 687 - 691
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (520 KB)  

    Most previous papers on class E power amplifier are based on an analysis method proposed by Raab in which it is assumed that the Q_L factor of the series-tuned circuit is high enough that the output current is essentially a sinusoid at the carrier frequency. In this paper, a new method for the analysis and design of a class E amplifier is presented and implemented for the case of the series-tuned, shunt-capacitor class E configuration, in which the assumption of infinite Q_L is eliminated. The amplifier performance equations are obtained by finding the steady-state initial conditions of the load-network state variables. The design requirements are then imposed on the resulting equations. This leads to a nonlinear system of design equations which is solved for the design values using numerical optimization methods. For values of Q_L less than 15, the differences between the design values obtained using this method and those given by Raab become gradually more significant. The performance curves given in this paper show clearly that the overall amplifier performance is strongly affected by Q_L . Therefore, this method of analysis and design is useful because it provides accurate design values which ensure optimum and safe performance for the class E amplifier even in cases of low Q_L , it provides quantitative criteria for the usual tradeoffs concerning Q_L , and it makes the amplifier performance more predictable. View full abstract»

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  • ARMA digital lattice filter based on new criterion

    Publication Year: 1987 , Page(s): 617 - 628
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1288 KB)  

    In this paper, a new ARMA digital lattice filter is proposed. First, a new criterion is defined for designing the ARMA digital lattice filter from given stochastic data. Based on this criterion, an ARMA parameter estimation algorithm is developed. This algorithm can estimate the ARMA parameters with little calculation cost. Then, from the fast algorithm of the ARMA parameter estimation, two elementary sections of the ARMA digital lattice filter are invented. Any ARMA model with an arbitrary AR order and an arbitrary MA order can be realized by using these elementary sections. In this paper, the proposed ARMA lattice filter is compared with other fast algorithms of ARMA parameter estimation and other ARMA lattice filters. Experimental results obtained from applying this filter to model reduction problems are shown. From these results, it is shown that this ARMA lattice filter is quite useful for ARMA digital signal processing. View full abstract»

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  • Nonlinear system analysis: Computationally efficient modification algorithms

    Publication Year: 1987 , Page(s): 639 - 649
    Cited by:  Papers (2)
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    A parameter matrix decomposition (PMD) multiparameter modification formalism is presented for the resolution of nonlinear matrix equations. An efficient computational algorithm is developed for a general voltage-dependent n -terminal device model encompassing current nonlinear IC models, including diode, BJT, and MOSFET models. A PMD simulator is implemented for dc analysis of BJT analog and digital circuits. Previous problems of numerical instability and excessive computational cost using rank 1 modification are avoided. View full abstract»

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  • Broad-band matching with maximally flat group delay characteristics

    Publication Year: 1987 , Page(s): 658 - 668
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1024 KB)  

    The paper presents a new approach to the design of a broad-band matching network which, when operating between two given terminating impedances, yields a maximally flat group delay characteristic. First, we use the indeterminate coefficients to construct a scattering matrix, and then present a theorem which states that if there exists a set of real numbers such that the scattering matrix satisfies the realizability conditions and the system transmission function possesses the maximally flat group delay characteristic, the problem is solvable. If the equalizer is an all-pole low-pass network, the set of real numbers can be expressed in terms of a normalizing frequency coefficient \xi . The solution is then simplified to that of finding \xi under realizability conditions. The method is simpler and more accurate than that given by Zysman and Carlin using integral restriction and the Appell function. View full abstract»

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  • Hierarchical models for systems reliability, maintainability, and availability

    Publication Year: 1987 , Page(s): 629 - 638
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1256 KB)  

    In this paper, the development of low-cost methodologies for the prediction and evaluation of system reliability, maintainability, and availability (RMA) is considered. Generalized Stochastic Petri Nets (GSPN's) are used as an analytical modeling tool. A general method of analysis for GSPN's by state aggregation is presented. This concept of aggregation is then applied to subnetworks, at the GSPN level, to reduce the model complexity. Using the above, a hierarchical model is obtained, based on the notion of time scale decompsotion, for system RMA. The above concepts are illustrated by examples. View full abstract»

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