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Circuits and Systems, IEEE Transactions on

Issue 9 • Date September 1977

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Displaying Results 1 - 8 of 8
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  • Amplifiers with maximum bandwidth

    Page(s): 510 - 512
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    A novel two-operational amplifier voltage amplifier is presented that has a bandwidth larger than any other possible single- or two-operational amplifier configuration. The maximum bandwidth singleoperational amplifier amplifiers are also dicussed. View full abstract»

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  • On parasitic oscillations in digital filters under looped conditions

    Page(s): 475 - 481
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    If a filter is used in multiplex telephone equipment, it actually operates in a loop due to the presence of two-wire/four-wire terminating equipment. Due to this, the power fed back into the filter input can, under adverse conditions, nearly equal the power leaving the output. This can be a cause for parasitic oscillations in case of digital filters. If properly designed, however, wave digital filters and nonrecursive digital filters remain stable. View full abstract»

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  • On the irreducible cascade synthesis of a system with a real rational transfer matrix

    Page(s): 481 - 494
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    In this paper, the problem of the irreducible synthesis of a real rational transfer matrix as a cascade (tandem connection) of first and second degree real systems is considered. A number of theoretical and practical results concerning the possibility of such a realization are deduced. In the process, the following results are obtained: 1) general forms for first and second degree real systems, 2) necessary and sufficient conditions for the extraction of a real first or second degree matrix, 3) a synthesis algorithm for a real rational transfer matrix as a cascade of first and second degree real systems, and 4) examples of situations where the real matrix cannot be so factored, even when it can be complex factored. The case where no cascade realization is available is rare, but possible. These results are of interest in simulation, in active and digital filter design of multiple input multiple output systems. View full abstract»

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  • On the minimum gain pole-sensitivity product of single amplifier RC active networks

    Page(s): 504 - 510
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    The minimum absolute value of the gain pole-sensitivity product of single amplifier RC active networks is presented. This minimum value is determined only from the transfer function and does not depend on whether the network is negative or positive feedback type. The real or imaginary part of the gain pole-sensitivity product can be made zero by some selections of the zeros of the RC passive network, however, the absolute value becomes minimum when neither the real or imaginary parts of the gain pole-sensitivity product are zero. The procedures for the realization of a prescribed gain pole-sensitivity product is also given. An illustrative example is presented. View full abstract»

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  • Optimum design of active filters using the generalized immittance converter

    Page(s): 495 - 503
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    Design equations are derived for the generalized immittance converter (GIC) when embedded in an arbitrary network. The derivation is based on minimizing the dependence of the GIC transfer function on the op amps' characteristics. Equations for the optimum design of the GIC when simulating inductance and frequency-dependent negative-resistance (FDNR) elements follow as special cases. The optimized GIC's are applied in the design of bandpass filters using Gorski-Popiel's ladder embedding technique. The design procedure is presented in detail and its application is illustrated through the design of a telephone-channel bandpass filter of the twelfth order. View full abstract»

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  • The hybrid matrix in linear multiple-loop feedback networks

    Page(s): 469 - 474
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    This paper presents the relationship between the determinant of the hybrid matrix and that of the conventional cutset-admittance or loop-impedance matrix. It is shown that the determinant of the return-difference matrix can be elegantly and compactly expressed as the ratio of the two functional values assumed by the determinant of the hybrid matrix under the condition that the elements of interest assume their nominal and reference values. The significance of the present approach is that it avoids the necessity of interpreting the loop gain in terms of the actual signal transmission around the closed loops in a signal-flow graph. View full abstract»

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