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Circuits and Systems, IEEE Transactions on

Issue 4 • Date April 1987

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Displaying Results 1 - 19 of 19
  • Foreword to special section on complex signal processing

    Publication Year: 1987 , Page(s): 337
    Cited by:  Papers (2)
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    Freely Available from IEEE
  • Comments on "Two-Amplifier Active-RC Biquads with minimized Dependence on Op-Amp Parameters

    Publication Year: 1987 , Page(s): 431 - 433
    Cited by:  Papers (2)
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    This paper presents a design of Deliyannis and Friend's biquad using one of Mikhael and Nessim's composite amplifiers. This design has half the Q and \omega _0 sensitivities of Schaumann's design[1] using the same biquad and composite amplifier. The parasitic stability problem is discussed and experimental results are given. View full abstract»

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  • High-frequency design of the Wien-bridge oscillator using composite amplifiers

    Publication Year: 1987 , Page(s): 441 - 443
    Cited by:  Papers (14)
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    First Page of the Article
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  • Correction to 'A switched differential op-amp with low offset and reduced 1/f noise' (Nov 86 1119-1127)

    Publication Year: 1987 , Page(s): 447
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    First Page of the Article
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  • Delay-time sensitivity in linear RC tree

    Publication Year: 1987 , Page(s): 443 - 445
    Cited by:  Papers (6)
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    The study of RC networks is important to understand digital MOS integrated circuits. Several authors studied these networks from the point of view of bounds on voltage waveform [1], [2], signal delay [3], etc. Wyatt [4] developed a qualitative theory of RC meshes having monotone elements. He showed that for a monotone exitation u(t) , the sensitivity of the output node voltage of a nonleaky line is monotonic due to any conductance on the line. View full abstract»

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  • Design of doubly-complementary IIR digital filters using a single complex allpass filter, with multirate applications

    Publication Year: 1987 , Page(s): 378 - 389
    Cited by:  Papers (74)  |  Patents (4)
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    It is shown that a large class of real-coefficient doubly-complementary IIR transfer function pairs can be implemented by means of a single complex allpass filter. For a real input sequence, the real part of the output sequence corresponds to the output of one of the transfer functions G(z) (for example, lowpass), whereas the imaginary part of the output sequence corresponds to its "complementary" filter H(z) (for example, highpass). The resulting implementation is structurally lossless, and hence the implementations of G(z) and H(z) have very low passband sensitivity. Numerical design examples are included, and a typical numerical example shows that the new implementation with 4 bits per multiplier is considerably better than a direct form implementation with 9 bits per multiplier. Multirate filter bank applications (quadrature mirror filtering) are outlined. View full abstract»

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  • Design of narrow-band FIR bandpass digital filters with reduced arithmetic complexity

    Publication Year: 1987 , Page(s): 409 - 419
    Cited by:  Papers (23)
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    A computationally efficient realization of a symmetrical bandpass FIR filter is derived. The realization is composed of two branches, each consisting of a cascade of two FIR sections. In each branch, the first FIR section has a sparse impulse response with only every L th sample being nonzero. The second section generates the remaining samples via interpolation. The method is applicable to both linear and nonlinear phase cases. Approximate expressions for the optimal value of L and the corresponding number of multipliers and adders required in the overall realization are derived. In narrow-band implementations, the number of multipliers and adders is approximately proportional to 1/\sqrt {{\Delta }F} , where {\Delta }F is the desired relative transition bandwidth. Typically, the required number of multipliers and adders is 1/2 to 1/4 th of those in the conventional linear or nonlinear phase direct-form implementations. The total number of delays is only slightly larger than that required in the conventional implementations. The structure allows simple tuning of the center frequency of the bandpass filter and has good finite wordlength properties. View full abstract»

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  • Low-sensitivity active filter realization using a complex all-pass filter

    Publication Year: 1987 , Page(s): 390 - 399
    Cited by:  Papers (5)
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    A wide class of continuous-time transfer functions may be implemented as the parallel combination of two all-pass filters, including Butterworth, Chebyshev, and elliptic low-pass approximations of odd order. Here, we consider the realization of even-order low-pass classical approximations and show that they may be decomposed in terms of complex all-pass functions. A systematic realization approach, based on scattering domain simulation (i.e., wave active filters), allows for a low-sensitivity active filter implementation. Further insight into the low-sensitivity property is gained by connecting the insertion loss of doubly terminated antimetric networks with the imaginary return loss of complex lossless networks. View full abstract»

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  • On the synthesis of median filter systems

    Publication Year: 1987 , Page(s): 420 - 429
    Cited by:  Papers (13)  |  Patents (1)
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    In this paper, we address the problem of median filtering synthesis, that is, the design of a median filter system realization that will satisfy a given set of specifications. In particular, we address the problem of a cascade median filter realization, where the performance of a median filter is achieved through the cascade of several median filters of smaller window size. Because of the nonlinear nature of these filters, a statistical performance criterion is chosen for the system specifications. In order to evaluate the output of the cascade filter, a method is developed which finds the statistics of the roots of median filters, where roots are signals obtained after several median filter passes. Finally, a VLSI implementation for a cascade median filter system is presented. View full abstract»

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  • Design of 2-D quadrature mirror FIR filters for image subband coding

    Publication Year: 1987 , Page(s): 438 - 441
    Cited by:  Papers (3)
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    A new 2-D subband coding scheme is proposed. Two-dimensional quadrature mirror filters (QMF's) can be efficiently designed by a separable product of identical 1-D QMF filters. Smith, Barnwell, and Mintzer's 1-D QMF design technique is carefully chosen and used in our 2-D subband filters. The resultant 2-D QMF filters and subband coder allow for "exact" reconstruction free of aliasing and of phase and frequency distortion, and will be very useful for image subband coding applications. View full abstract»

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  • Complex digital signal processing over finite rings

    Publication Year: 1987 , Page(s): 365 - 377
    Cited by:  Papers (16)
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    Very recently, the quadratic residue number system (QRNS) has been introduced [8], [9]. It is, in fact, a rediscovery of earlier work [29]. The QRNS is obtained from a mapping of Gaussian integers over a finite ring to a ring of conjugate elements. This conjugate ring has the remarkable property that both addition and multiplication are performed componentwise. The operations are performed over subrings, isomorphic to the conjugate ring, and the results are mapped to the conjugate ring via the Chinese remainder theorem (CRT). The QRNS has since been generalized for any type of moduli set, with an inherent dynamic range reduction, and has been termed the quadratic-like residue number system (QLRNS) [7]. An alternate form removes the dynamic range reduction but requires an increase in multiplications from two to three; this system has been termed the modified quadratic residue number system (MQRNS) [3], [4]. This tutorial paper is a companion to another paper in this special issue [32]; it consolidates work on quadratic system implementations, with special emphasis on the modified system. The paper discusses, in some detail, the quadratic implementation of the two forms of complex convolution, which are naturally defined over finite rings, or fields, and which incur no scaling overhead. A new notation is introduced that eliminates confusion over the several mappings that are required in the quadratic representation, and initial work on the implementation of finite ring computational elements, suitable for VLSI fabrication, is also presented. View full abstract»

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  • Efficient time-recursive least-squares algorithms for finite-memory adaptive filtering

    Publication Year: 1987 , Page(s): 400 - 408
    Cited by:  Papers (12)
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    This paper deals with efficient algorithms in the sense of minimization of the computational complexity for least-squares (LS) adaptive filters with finite memory. These filters obtain the current estimate of the desired response using only a fixed finite number of past data. First, two new fast recursive least-squares algorithms with computational complexities 14m and 15m multiplications and divisions per recursion (MADPR), respectively, are introduced ( m is the filter order). Then a new estimation-error-oriented recursive modified Gram-Schmidt (RMGS) scheme with a complexity of 2m^{2} + 10m MADPR is given. Finally, the learning characteristics of these algorithms are discussed and some simulation results are included. View full abstract»

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  • Multidimensional digital filters with closed loss behavior designed by complex network theory approach

    Publication Year: 1987 , Page(s): 338 - 344
    Cited by:  Papers (12)
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    A very efficient design approach is presented for designing compact multidimensional digital filters having closed loss behavior (e.g., loss behavior with approximately circular, spherical, etc., symmetry). The approach is based on the use of results in the theory of classical complex circuits. The resulting transfer functions can be implemented by means of any suitable type of multidimensional digital filter structure, particularly in the form of multidimensional wave digital filters. In this way, very efficient designs offering all the advantages obtainable from using wave digital filters can be achieved. View full abstract»

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  • A constraint on the zeros of ternary polynomials

    Publication Year: 1987 , Page(s): 430 - 431
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    Information on the location of the zeros of polynomials with coefficients in {0,1, - 1} is useful in the study of some structures for the VLSI implementation of FIR digital filters. This letter shows that those zeros are confined to a ring-like region of the complex plane. View full abstract»

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  • Efficient design of 2-D multiplierless FIR filters by transformation

    Publication Year: 1987 , Page(s): 436 - 438
    Cited by:  Papers (7)
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    This paper deals with the design of 2-D multiplierless FIR digital filters. First, a special class of multiplierless 1-D FIR filters is designed with coefficients which are a sum or difference of power of two. This is then mapped into 2-D multiplierless FIR filters by the McClellan transform. This technique has the advantage that it is very fast, because only a 1-D filter must be designed. Also, the hardware implementation for these 2-D FIR filters is very attractive and efficient. View full abstract»

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  • The design of dual-mode complex signal processors based on quadratic modular number codes

    Publication Year: 1987 , Page(s): 354 - 364
    Cited by:  Papers (13)
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    It has been known for a long time that quadratic modular number codes admit an unusual representation of complex numbers which leads to complete decoupling of the real and imaginary channels, thereby simplifying complex multiplication and providing error isolation between the real and imaginary channels. This paper first presents a tutorial review of the theory behind the different types of complex modular rings (fields) that result from particular parameter selections, and then presents a theory for a "dual-mode" complex signal processor based on the choice of augmented power-of-2 moduli. It is shown how a diminished-1 binary code, used by previous designers for the realization of Fermat number transforms, also leads to efficient realizations for dual-mode complex arithmetic for certain augmented power-of-2 moduli. Then a design is presented for a recursive complex filter based on a ROM/ACCUMULATOR architecture and realized in an augmented power-of-2 quadratic code, and a computergenerated example of a complex recursive filter is shown to illustrate the principles of the theory. View full abstract»

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  • Precision switched-capacitor attenuator

    Publication Year: 1987 , Page(s): 446 - 447
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    The problem of capacitor mismatch error in a switched-capacitor voltage divider (attenuator) is addressed. It is shown that, with the help of a ratio-independent voltage multiplier (amplifier) proposed earlier, it is possible to make the error in the voltage divider arbitrarily small, at the expense of time. This precision voltage divider is expected to be useful in a wide range of precision analog signal-processing applications. View full abstract»

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  • Design of a logic circuit for microprocessor recovery from a power failure and a transient fault

    Publication Year: 1987 , Page(s): 433 - 436
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (496 KB)  

    Nonredundant microprocessor ({\mu}p) controlled systems often necessitate the use of built-in algorithms and/or hardware logic in order to ensure reliable and smooth functioning of the {\mu}p whenever a fault occurs during normal operation or power-up sequence. In this paper, we present a class of fault-detection algorithms and hardware recovery circuit along with their implementation methodology. The novelty of the proposed design lies in the simplicity of the logic circuit and software algorithms and their ready adaptability to any {\mu}p . View full abstract»

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  • Implementation of real coefficient digital filters using complex arithmetic

    Publication Year: 1987 , Page(s): 345 - 353
    Cited by:  Papers (19)
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    Complex coefficient digital filters, with applications for processing real sequences, are examined. The method is quite general, and allows any real rational transfer function to be expressed in terms of a complex rational transfer function of reduced order. When implemented in complex hardware form, the reduction of filter order can provide an increase in computational efficiency and speed. Conventional filter structures, such as parallel, cascade, lattice, and state-space forms, are extended to the complex domain. Illustrative examples of complex coefficient filter synthesis are included, along with coefficient sensitivity comparisons between the complex coefficient filters and their real coefficient counterparts. View full abstract»

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