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Proceedings of the IEEE

Issue 2 • Feb. 1980

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Displaying Results 1 - 25 of 27
  • [Front cover and table of contents]

    Publication Year: 1980, Page(s): c1
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    Freely Available from IEEE
  • Scanning the issue

    Publication Year: 1980, Page(s): 195
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  • A fundamental result concerning the topology of transistor circuits with multiple equilibria

    Publication Year: 1980, Page(s):196 - 208
    Cited by:  Papers (62)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1387 KB)

    It is shown that a necessary and sufficient condition for a transistor network to possess more than one solution to its dc equations, for some choice of network parameter values, is that a certain simple set of connections, involving some pair of transistors, is present in the circuit's topological structure. The presence of this set of connections, prescribing the presence of a certain special tw... View full abstract»

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  • Theory of microwave coupled-line networks

    Publication Year: 1980, Page(s):209 - 231
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1695 KB)

    The multiwire line forms the basis of many practical microwave filtering and coupling circuits. It also has considerable importance as a circuit element in formal synthesis procedures. This paper is concerned with a tutorial presentation of the various methods of analysis for such multiwire lines leading to a number of different equivalent circuits, and with the use of these for synthesis and desi... View full abstract»

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  • Waveform encoding of voiceband data signals

    Publication Year: 1980, Page(s):232 - 247
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1394 KB)

    This is a tutorial paper on encoding the waveform of voiceband data signals into digital form for digital transmission. The encoding algorithms covered are PCM, DPCM, and DM with and without quantizer adaptation. Coder bit rates from 16 to 64 kb/s are considered. Most digital Codec's on voiceband channels are designed primarily for speech and their performance with speech is well known. However, s... View full abstract»

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  • Electric dyadic Green's functions in the source region

    Publication Year: 1980, Page(s):248 - 263
    Cited by:  Papers (340)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1709 KB)

    A straightforward approach that does not involve delta-function techniques is used to rigorously derive a generalized electric dyadic Green's function which defines uniquely the electric field inside as well as outside the source region. The electric dyadic Green's function, unlike the magnetic Green's function and the impulse functions of linear circuit theory, requires the specification of two d... View full abstract»

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  • Pole extraction from real-frequency information

    Publication Year: 1980, Page(s):263 - 273
    Cited by:  Papers (70)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    This paper describes a procedure, analogous to Prony's method, for extracting the complex-frequency poles of electromagnetic transfer functions. The method is refined mathematically and is applied to both electrical and mechanical test cases. The paper explains a multiple processing technique, involving the overlaying of several pole sets, by which redundant data are used to separate actual from c... View full abstract»

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  • Resolution of coherent sources incident on a circular antenna array

    Publication Year: 1980, Page(s):276 - 277
    Cited by:  Papers (7)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    A method of processing voltages received on a circular antenna array which calculates the number, azimuths, and relative strengths of coherent sources is described. The method can be extended to any array geometry where inverse filtering (or deconvolution by the inverse beamspreading function) can be applied. In particular, it can be applied directly to a linear array geometry. In the analysis, th... View full abstract»

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  • Reflection and transmission coefficients for backward waves on a corrugated YIG film

    Publication Year: 1980, Page(s):277 - 279
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (338 KB)

    The reflection and transmission coefficients for the backward magnetic waves on a YIG film with periodic surface corrugations are systematically deduced from the solution of the full magnetostatic boundary-value problem. The phenomenological boundary condition for the slowly varying amplitude in the coupled mode equations is also obtained. View full abstract»

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  • Exact surface impedance for a spherical conductor

    Publication Year: 1980, Page(s):279 - 281
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (314 KB)

    A spherically concentric model of the earth is employed to obtain expressions for the surface impedance matrix at the surface. It is shown the surface impedance is a function of both the earth's electrical parameter and the source field configuration. In some cases the latter dependence is of minor consequence. View full abstract»

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  • Equiripple stopband characteristic for circularly symmetric 2-D recursive filters

    Publication Year: 1980, Page(s):281 - 282
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (170 KB)

    A circularly symmetric 2-D recursive digital filter whose magnitude-squared response approximates a Gaussian function in the two frequency variables has a separable transfer function. Such a circularly symmetric filter has a monotonic frequency response. One may, therefore, want to sharpen the response in the transition band. Due to the separability feature, it is shown how to obtain an equiripple... View full abstract»

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  • A note on [A, B, C, D]

    Publication Year: 1980, Page(s):283 - 284
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (182 KB)

    For arbitrary linear passive networks it is possible to suggest bounds of the type f(A, B, C, D) ≥ 0. A novel inequality is presented for linear reciprocal resistive two-ports: A2+ B2+ C2+ D2+ AB + CD ≥ √3 It is common practice in electrical engineering to consider a two-port as an operator represented by a 2 × 2 matrice acting on ... View full abstract»

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  • Fourier analysis using spectral observers

    Publication Year: 1980, Page(s):284 - 285
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    New techniques for Fourier spectral analysis are reported, for which ongoing spectral estimates are generated in real time. The algorithms are recursive, expressable in state variable form, and involve real number computations. The ability of these spectral observers to perform one-step-per-sample updating is demonstrated with numerical examples. View full abstract»

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  • Effects of subharmonic frequencies on DFT coefficients

    Publication Year: 1980, Page(s):285 - 286
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (202 KB)

    When relatively short data segments are used in DFT analysis, DFT coefficients are affected by subharmonic frequencies in the data record. The characteristics of these effects as a function of magnitude and phase are described herein. View full abstract»

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  • A microwave discriminator at 35 GHz

    Publication Year: 1980, Page(s):286 - 288
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    The implementation of a new form of microwave frequency discriminator is described. For a center frequency of 35 GHz the measured bandwidth between response peaks was 400 MHz compared to a theoretical value of 441 MHz. Sensitivity at center frequency measured 4 mV/MHz for an input power level of about 0.9 mW. View full abstract»

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  • A note on resistor loops

    Publication Year: 1980, Page(s):288 - 289
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (206 KB)

    Methods to directly measure the element values of a resistor loop without opening it are presented. View full abstract»

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  • A serial digital-to-analog converter for nonlinear input-output relationships

    Publication Year: 1980, Page(s):289 - 290
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (405 KB)

    A new digital-to-analog converter (DAC) is presented for applications when the input-output variation is nonlinear. This serial DAC consists of the Shannon-Rack Decoder and some other circuits. Many types of nonlinearity may be realized in the method proposed here. View full abstract»

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  • An equiripple bandpass recursive digital filter with adjustable skirt selectivities

    Publication Year: 1980, Page(s):290 - 291
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (158 KB)

    A method is proposed for the design of a recursive digital filter with equiripple passband magnitude response and exchangeable zeros at ωT = 0 and ωT = π rad, hence adjustable skirt selectivities. It employs the transform variables technique which is well known for numerical accuracy. View full abstract»

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  • Analysis of active switched-capacitator networks

    Publication Year: 1980, Page(s):292 - 293
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (190 KB)

    It is shown that amplifier matrices can be included in the nodal equation formulation for the analysis of switched-capacitor networks. This avoids any requirements for equivalent circuits and enables a straightforward application to computer analysis. For ideal operational amplifiers constraint theory is shown to be applicable. View full abstract»

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  • A fully integrated digital pulse rate doubler

    Publication Year: 1980, Page(s):293 - 295
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (521 KB)

    A new, simple, fully integrated digital pulse rate doubling circuit that requires no passive energy storage elements is reported. The integrated circuit has been realized in a standard bipolar technology using only n-p-n and p-n-p transistors and diffused resistors. View full abstract»

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  • An adjustable model reference adaptive control reconfiguration of self-tuning pole replacement

    Publication Year: 1980, Page(s):295 - 296
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (243 KB)

    An adjustable model reference adaptive control strategy is proposed where both the controller and reference model parameters are adapted. Adaptive control laws for this new structure implementing pole cancellation and replacement and avoiding the zero cancellation usually required by model reference adaptive control are developed from self-tuning adaptive algorithm modification. View full abstract»

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  • A bit-serial device for maximization and sorting

    Publication Year: 1980, Page(s):296 - 297
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (242 KB)

    A simple device for the bit-sequeatial extraction of the maximum of an integer vector is presented. The extension of the method to vector sorting is also examined. View full abstract»

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  • A Lamb wave device for a communication system with ternary logic

    Publication Year: 1980, Page(s):297 - 298
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (450 KB)

    A new type of Lamb wave device for signal processing with ternary logic is presented. The transducer consists of a group of three electrodes deposited on two surfaces of a thin piezoelectric substrate. One is on the bottom surface as a common earth electrode. The other two are interdigital electrodes on the top surface. By using the device having two transducers, a communication system with ternar... View full abstract»

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  • Performance of DS spread spectrum systems

    Publication Year: 1980, Page(s):298 - 300
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    In a direct sequence (DS) spread spectrum communication system the processing gain is approximately the ratio of chip rate to the data rate. Here a more accurate formulation is obtained in terms of signaling, system, and noise parameters. It is useful for performance comparisons since it is valid for all possible parameter values. View full abstract»

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  • Light water

    Publication Year: 1980, Page(s): 300
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    Freely Available from IEEE

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H. Joel Trussell
North Carolina State University