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Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on

Issue 2 • Date Feb 1996

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Displaying Results 1 - 12 of 12
  • Ratioed voter circuit for testing and fault-tolerance in VLSI processing arrays

    Publication Year: 1996 , Page(s): 143 - 152
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (848 KB)  

    Fault detection and fault-tolerance in modular processing arrays are reviving the use of majority voting techniques. In this paper, a simple voting circuit structure, called a ratioed voter, is analyzed to prove its reliable operation when Dynamic N-Modular Redundant (DNMR) tuples are configured for testing in fault-tolerant processing arrays. Its application in VLSI design for self-testing would lead to low area overhead and high diagnosability, both contributing to improve yield. Moreover, the flexibility of such a structure, which allows modulation of the voting level (N), permits a common approach for fabrication-time and on-line testing View full abstract»

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  • Novel CCI-based single-element-controlled oscillators employing grounded resistors and capacitors

    Publication Year: 1996 , Page(s): 153 - 155
    Cited by:  Papers (21)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (252 KB)  

    Novel single-element controlled oscillator circuits using two negative first-generation current-conveyors, two (or three) grounded capacitors and three (or two) grounded resistors are presented. The proposed circuits enjoy oscillation control through a single grounded passive element and independent frequency control through another single grounded passive element View full abstract»

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  • On linear topological conjugacy of Lur'e systems

    Publication Year: 1996 , Page(s): 158 - 161
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (316 KB)  

    In this letter, we prove several results regarding linear conjugacy between Lur'e systems. For example, we prove that except for a measure zero set, two Lur'e systems are linearly conjugate if they share an equilibrium point and the eigenvalues of the Jacobian matrices are matched at every point. A corollary of that result is that piecewise-linear vector fields with parallel boundary planes are determined, up to linear conjugacy, by the boundary planes, the equilibrium points and the eigenvalues in each region View full abstract»

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  • High frequency applications based on a new current controlled conveyor

    Publication Year: 1996 , Page(s): 82 - 91
    Cited by:  Papers (186)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (840 KB)  

    When the mixed translinear loop is used in a voltage follower implementation the value of its output resistance depends on its bias current. This property is used in the realization of a current controlled conveyor (CCCII), which has therefore its serial resistance on port X controlled by the bias current. The two basic implementations, that allow from a CCCII and without additive resistances to realize controlled voltage-current converters, are described. A current-controlled voltage-amplifier and a current-controlled current-amplifier are then analyzed. They are implemented from only two CCCIIs and do not require any passive component. The principal implementations for current controlled first-order transfer functions, operating either in voltage-mode or in current-mode, are introduced. They require one or two of the preceding controlled conveyors and use capacitors only. SPICE simulation results, obtained using the parameters of the HF3CMOS process from SGS THOMSON, are given for the CCCII and for its main applications. They confirm the validity of the theoretical analyzes and also underline the high frequency potential of the current controlled implementations introduced. A second-order bandpass filter, operating in voltage-mode, is also described. It is obtained from CCCIIs and two capacitors only. Its centre frequency, which is adjustable by acting on the control currents of the conveyors, is equal to 11.3 MHz for I0=20 μA and to 16.6 MHz for I0=30 μA. This variation produces very small changes in both the quality factor and the gain (variations less than 7%). Comparisons between existing OTA circuits and the ones implemented from controlled conveyors, are also given. They underline the advantage which result from implementations using controlled conveyors View full abstract»

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  • Novel RC oscillators using the current-feedback operational amplifier

    Publication Year: 1996 , Page(s): 155 - 157
    Cited by:  Papers (20)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (184 KB)  

    Novel oscillator circuits using the current-feedback operational amplifier (CFOA) are presented. Each circuit uses one CFOA and five passive elements. Some of the circuits enjoy independent control of the frequency and the condition of oscillation. Experimental results are included View full abstract»

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  • On a conjecture regarding the synchronization in an array of linearly coupled dynamical systems

    Publication Year: 1996 , Page(s): 161 - 165
    Cited by:  Papers (22)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (304 KB)  

    In this letter, we give supporting evidence for a conjecture regarding the amount of coupling needed to synchronize an array of linearly coupled dynamical systems. Roughly speaking, the conjecture says that the coupling needed to synchronize an array of coupled systems is inversely proportional to the nonzero eigenvalue of the coupling graph that is smallest in magnitude. The conjecture implies that the coupling needed to synchronize an array can be derived from the coupling topology and the coupling needed to synchronize two coupled dynamical systems View full abstract»

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  • Differential-algebraic equations and impasse points

    Publication Year: 1996 , Page(s): 122 - 133
    Cited by:  Papers (19)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1064 KB)  

    Impasse points can occur in the analysis of Differential-Algebraic-Equations (DAE's) that, for example, describe the dynamic behavior of electrical networks. Such points are usually characterized by the condition that solutions of the DAE in question cannot be continued beyond them. However, it turns out that several classes of impasse points, each of which represents different behavior of the DAE, do exist. In this paper, relations between these classes and between impasse points and pseudolimit points are examined for the first time. Sufficient conditions as well as necessary conditions for a point to be an impasse are given. Known results similar to ours are restricted to the class of forward and backward impasse points and concern continuously differentiable solutions only. We extend and generalize them; some become special cases of theorems in this paper. Other results are disproved by our counterexamples View full abstract»

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  • A filter-based technique for the harmonic balance method

    Publication Year: 1996 , Page(s): 92 - 98
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (576 KB)  

    The Harmonic Balance Method (HBM) allows an efficient determination of the steady-state solution of mildly non-linear circuits; however, in the presence of strong nonlinearities, it often fails to converge. The reasons of such behavior are investigated in this paper. In order to improve convergence, a modified HEM technique is presented, based upon the idea of filtering used in sampled data systems. This technique has been successfully employed in the simulation of strongly nonlinear circuits, such as periodically switched circuits. Results are reported together with the details of the method View full abstract»

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  • Design and analysis of bilinear digital ladder filters

    Publication Year: 1996 , Page(s): 69 - 81
    Cited by:  Papers (8)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1204 KB)  

    Methods for designing bilinear switched-capacitor (SC) ladder filters are well known. However, they cannot be directly extended to digital filters because of the delay-free loops allowed in SC filters. In the present paper, design methods for low-sensitive bilinearly transformed voltage-current ladder filters are developed. The matrix approach for SC filter design is extended to digital filters, and the delay-free loops are eliminated. Design equations for general order low-pass, high-pass, bandpass, bandstop, and allpass filters are obtained in a simple closed form. The design procedure gives a canonical number of delays and a number of distinct multipliers equal to the number of reactive elements in the prototype. A number of test filters are analyzed with respect to magnitude sensitivity, magnitude response with respect to coefficient quantization, occurrence of limit cycles, stability, quantization noise levels, and structural complexity. The results are compared to wave digital filters (WDF), and cascade-form filters. It is found that bilinear digital ladder filters (BDLF) in most cases perform better than WDFs, while they at the same time have a simpler structure View full abstract»

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  • Optimal transient simulation of transmission lines

    Publication Year: 1996 , Page(s): 110 - 121
    Cited by:  Papers (107)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1184 KB)  

    This paper presents an attempt to formulate a high-level description of the optimal transmission line simulation method. To formulate the optimal approach, most significant aspects of the problem are identified, and alternative approaches in each of the aspects are analyzed and compared to find the combination that results in the maximum efficiency, accuracy and applicability for the transient analysis of digital circuits. The practical implementation of the optimal method for uniform multiconductor lossy frequency-dependent lines characterized by samples of their responses is outlined. It is shown on an extensive set of runtime data that, based on the optimal approach, the accurate line modeling in a circuit simulator is as efficient as the simple replacement of interconnects with lumped resistors View full abstract»

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  • Nonnegative realization of a linear system with nonnegative impulse response

    Publication Year: 1996 , Page(s): 134 - 142
    Cited by:  Papers (67)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (836 KB)  

    Let H(z) be a rational transfer function, with associated nonnegative impulse response sequence. The paper considers the question: When does there exist a triple A∈RN×N, b∈R N, c∈RN with all nonnegative entries H(z)=c'(zI-A)-1b? An essentially complete characterization is given of the H(z) allowing such a realization, in terms of the location of the pole or poles of H(z) with maximum modulus View full abstract»

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  • A systematic search method for obtaining multiple local optimal solutions of nonlinear programming problems

    Publication Year: 1996 , Page(s): 99 - 109
    Cited by:  Papers (24)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1076 KB)  

    We propose, in this paper, a systematic method to find several local optimal solutions for general nonlinear optimization problems. We have developed some analytical results for quasi-gradient systems and reflected gradient systems, applying these results to derive topological and geometric properties of the critical points of the underlying objective function. A mechanism has also been devised to escape from a local optimal solution and proceed into another local optimal solution via decomposition points. By properly switching between quasi-gradient systems and reflected gradient systems, our proposed method can attain a set of local optimal solutions. The proposed method is applied to two test examples with promising results View full abstract»

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