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Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on

Issue 12 • Date Dec 1994

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Displaying Results 1 - 8 of 8
  • Realizations of high-order switched-capacitor filters using multiplexing technique

    Page(s): 778 - 785
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    A new SC design methodology using multiplexing technique is proposed to realize arbitrary high-order filters. In this methodology, the filter transfer function is transformed as the combination of biquads and their outputs are computed sequentially by the multiplexing SC biquad circuit. Four basic function SC circuits are introduced and a filter can be implemented by various combinations of these circuits. This makes the proposed method more versatile and practical. Because of the efficient use of multiplexing techniques, the realized high-order filters have less op-amps, switches, and capacitors, and thus small chip area, but at the cost of increasing clock phases. An eighth-order Butterworth low-pass filter design example is presented to demonstrate how to apply the proposed method to the design of high-order filters. Moreover, an eighth-order low-pass filter has been designed and fabricated in 1.2 μm CMOS double-poly double-metal process. Both computer simulation and experimental results have successfully verified the function correctness and the performance of the proposed design method View full abstract»

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  • Extension of a finite version of the sampling theorem

    Page(s): 821 - 823
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (228 KB)  

    The present paper approaches a multichannel sampling scheme, and provides a generalized sampling expansion for two-dimensional, bandlimited, not necessarily orthogonally periodic signals. It is shown that the signal can be reconstructed from a number of sampling points equal to the number of its harmonic components. The sampling density can be decreased in the multichannel approach with respect to the one-channel approach. One- and two-dimensional special cases are considered View full abstract»

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  • A linear approach for two-dimensional, frequency domain, least square, signal and system modeling

    Page(s): 786 - 795
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (808 KB)  

    A linear algorithm for two-dimensional (2-D) least square (LS) approximation in the frequency domain is presented. The algorithm is based on the equation error model. The approximation yields a 2-D rational function in the complex variables, or equivalently a 2-D autoregressive, moving-average (ARMA) process. The proposed two-dimensional, least square, frequency domain (2D-LS-FD) algorithm can efficiently represent 2-D signals or images. It is also capable of accurately modeling 2-D linear and shift invariant (LSI) stable systems, when the model has a sufficient order relative to the unknown and the identification noise is negligible. This paper will also discuss, with proofs, the important existence, uniqueness and convergence properties associated with this technique. Simulation examples for signal and system modeling are given to show the excellent performance of the algorithm. In addition, the successful application of the developed algorithm to image noise cancellation is also presented View full abstract»

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  • Switched-capacitor FIR filters-a feasibility study

    Page(s): 823 - 827
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    This paper presents the design and the implementation of three different switched-capacitor FIR filter topologies: a 2-phase direct-form implementation and two poly-phase cascade realizations based on second and fourth order building blocks. The two cascade approaches employ a 3-phase and a 6-phase clocking scheme, respectively. Each method is illustrated by a numerical example and results from silicon prototype circuits are presented. The practical results demonstrate the viability of the proposed implementations and reveal the area and power efficiency of the presented cellular FIR filter approaches View full abstract»

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  • Real-valued decimation-in-time and decimation-in-frequency algorithms

    Page(s): 808 - 816
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    The decimation-in-time (DIT) and the decimation-in-frequency (DIF) algorithms are the typical forms of the fast Fourier transform (FFT) algorithm. Many hardware and software implementations are based on these algorithms. One class of fast algorithms for computing the discrete Fourier transform (DFT) is based on a recursive factorization of the polynomial 1-zN. This paper introduces a simple recursive factorization of 1-zN over the real numbers and a mathematical framework that generalizes the form of the DFT. Using the recursive factorization, efficient algorithms are derived to compute the DFT and the cyclic convolution of sequences of length with a power of two. Real-valued DIT and real-valued DIF algorithms are developed so that the accumulated FFT technologies can be fully utilized for real sequences. Introducing a real-valued butterfly, the algorithmic structures of the DIT and the DIF algorithms are shown to be equally applicable for the real-valued algorithms by systematic modifications. The computational complexity is fairly comparable with other available fast algorithms View full abstract»

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  • An analytical approach for obtaining a closed-form solution to the least-square design problem of 2-D zero-phase FIR filters

    Page(s): 796 - 807
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    A closed-form least-square solution to the design problem of general two-dimensional (2-D) real zero-phase FIR filters is obtained. An in-depth study of the functions and matrices arising from the problem definition reveals some very useful structural properties. It is shown that these properties lead to an optimal analytical solution for the filter coefficients, making it unnecessary to use design procedures involving optimization techniques or matrix inversion operations. The derived closed-form expressions for filter coefficients allow their evaluation directly from the filter's frequency response specifications, resulting in a greatly reduced computational complexity. It is confirmed through design examples that the proposed technique enjoys a very short design time and it rises very slowly as the filter order is increased View full abstract»

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  • Fault-tolerant dynamic multilevel storage in analog VLSI

    Page(s): 827 - 829
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    We present an area-efficient dynamic storage technique for repetitively quantizing and refreshing the analog contents of volatile capacitive memories in VLSI, incorporating redundancy and statistical averaging to avoid sudden loss of information triggered by occasional errors in the quantization. Experimental results obtained from a CMOS implementation are included, validating the robustness of the refresh scheme for long-term analog storage in excess of 8 bit resolution View full abstract»

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  • Design of arbitrary complex coefficient FIR digital filters by complex weighted least squares approximation

    Page(s): 817 - 820
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    Real weighted least squares (WLS) approach is extended to complex cases for designing arbitrary complex FIR filters. The method is based on an iterative complex WLS approach to obtain a least squares approximation to the desired complex frequency responses, and the weighting function at each iteration is updated using the result of the previous iteration, which leads to the optimal approximation in the complex Chebyshev sense. Some numerical design examples such as single-passband filters and complex all-pass filters are presented, which demonstrate the usefulness of the present approach View full abstract»

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Aims & Scope

This title ceased production in 2003. The current updated title is IEEE Transactions on Circuits and Systems II: Express Briefs.

Full Aims & Scope