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Popular Articles (February 2015)

Includes the top 50 most frequently downloaded documents for this publication according to the most recent monthly usage statistics.
  • 1. An efficient approach to the computation of analytic, pseudo analytic sensitivities and noise in an APL general purpose CAD program

    Publication Year: 1982 , Page(s): 16 - 31
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (77222 KB)  

    An approach to sensitivity computation has been implemented for IC circuits using gate arrays, where the design engineer needs only to alter parameters defining the horizontal geometry of devices. An efficient technique has been used to transpose a pre-ordered sparsely-stored circuit matrix, leaving the program's optimal ordering strategy invariant. As a consequence, only one solution of adjoint-type equations is needed at a DC point, or at a frequency (AC) or time point, to compute the sensitivities of an output variable with respect to any number of parameters. In noise computation, one AC solution is sufficient to compute the RMS noise at an output regardless of the number of noise expressions. Furthermore, unlike other programs, the Interactive Circuit Design Program used allows noise expressions that could be functions of an arbitrary set of parameters, voltages, currents, and frequency and therefore, the most commonly used noise sources are covered. Examples show that lab measurement of noise agrees with simulation. View full abstract»

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  • 2. SWITCAP: A switched-capacitor network analysis program part I: Basic features

    Publication Year: 1983 , Page(s): 4 - 10
    Cited by:  Papers (28)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (9777 KB)  

    The user aspects of a switched-capacitor network analysis program, SWITCAP, are discussed. The relation of the program's simulation facilities (such as frequency-domain analysis, time-domain analysis, and sampling functions) to actual laboratory measurement setups incorporating function generators, oscilloscopes, and spectrum analyzers is described in detail. Some examples illustrating the basic features of the program are also given. View full abstract»

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  • 3. Algebraic formulation of the fast Fourier transform

    Publication Year: 1981 , Page(s): 9 - 19
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2132 KB)  

    A new unified formulation of the fast Fourier transform is presented. It is shown that all FFT algorithms can be derived by different methods of multidimensional array unwrapping. The eight principal decimation in time FFT algorithms are derived. Two algorithms with the desirable properties of sequential input, sequential output and identical computational geometry are also derived. The derivation of the decimation in frequency FFT algorithms is then discussed. While most of the results presented here have been derived earlier using matrix Kronecker products, the present formulation is simpler and more intuitive that the equivalent matrix formulation. View full abstract»

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  • 4. Single-chip microcomputer application in high-altitude balloon orientation system

    Publication Year: 1980 , Page(s): 1 - 7
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (952 KB)  

    Describes the application of a single-chip microcomputer in a high-altitude balloon instrumentation system. The system, consisting of a magnetometer, a stepping motor, a microcomputer and a gray code shaft encoder, is used to provide an orientation reference to point a scientific instrument at an object in space. The single-chip microcomputer, Intel's 8748, consisting of a CPU, program memory, data memory and I/O ports, is used to control the orientation of the system. View full abstract»

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  • 5. The Gaver-Stehfest algorithm for approximate inversion of Laplace transforms

    Publication Year: 1983 , Page(s): 4 - 8
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (6113 KB)  

    An approximate technique for the inversion of Laplace transforms is represented and some simple applications are given. The limitations of the method were explored and it is clear that functions which have oscillatory inverses present difficulty for the method. Better approximations result from the use of computers with longer word lengths and there is considerable improvement when an averaging algorithm is employed. Eight-bit microcomputers are generally sufficiently accurate for nonoscillatory time functions but transforms for lightly damped sinusoids and Bessel functions require large main-frame computers with relatively long word length. View full abstract»

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  • 6. Fundamentals of the switched-capacitor approach to circuit synthesis

    Publication Year: 1984 , Page(s): 12 - 21
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1858 KB)  

    An overview is given of the switched-capacitor approach to circuit synthesis developed by the author in the early 1960s. The author presents the switched-capacitor (SC) approach as a method of synthesizing various types of circuits, one of which includes filters and A/D convertors. He considers fundamental concepts and ideas, basic structures and circuits, and their functional capabilities in signal processing of various kinds of analog and digital signals. Operating in discrete time of number pulses and using capacitors for voltage-charge conversion, the method allows direct processing of voltages, charges, numbers of pulses, pulse frequencies, and digital signals providing extremely wide capabilities for signal processing. Sample structures and circuits are given for various types of linear and nonlinear algebraic and dynamic functions, for discontinuous and quasi-continuous operation, and for processing and producing analog, frequency and pulse-number modulated and binary coded digital signals and combinations thereof. View full abstract»

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  • 7. Analysis of switched-capacitor networks — An overview

    Publication Year: 1984 , Page(s): 10 - 15
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (7043 KB)  

    Numerous approaches have recently been discussed in the literature for the analysis of switched-capacitor circuits. A comprehensive review is made of the published techniques. View full abstract»

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  • 8. SWITCAP: A switched-capacitor network analysis program part II: Advanced applications

    Publication Year: 1983 , Page(s): 41 - 46
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (10228 KB)  

    For pt.I see ibid., vol.5, no.3, p.4-10 (1983). The authors discuss the applications of a general switched-capacitor network (SCN) analysis program called SWITCAP for simulating SCNs containing continuous signal paths, clock feedthrough, resistors, finite-bandwidth amplifiers, and/or many phases. View full abstract»

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  • 9. Combined photovoltaic/thermal solar array DC electrical model

    Publication Year: 1981 , Page(s): 7 - 13
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1171 KB)  

    An electrical model of a combined photovoltaic/thermal solar array has been developed to predict the steady state behavior of the line currents, power output and array voltage. The effects of temperature on the solar cell characteristics is included in the analysis. The model includes line isolation diodes and `open cell' bypass diodes. A numerical procedure based on the Contraction Mapping Fixed Point Theorem is used to solve the associated nonlinear equations. View full abstract»

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  • 10. Adaptive digital techniques for audio noise cancellation

    Publication Year: 1979 , Page(s): 2 - 7
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3180 KB)  

    Discusses two adaptive digital techniques for audio noise cancellation. The first technique, adaptive predictive deconvolution, uses an adaptive linear predictor to estimate and cancel (time) correlated noise components on an audio signal. The second technique, adaptive filtering, employs two audio signal inputs, the first having the desired audio signal along with noise and the second sensing principally the noise. The second, noise signal is adaptively filtered and subtracted from the first signal cancelling noise components common to the two inputs. A stand-alone digital signal processor has been developed to carry out these two noise cancellation techniques. This automatic digital audio processor, ADAP, carries out these processes in real time with up to a 256th order digital filter. View full abstract»

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  • 11. A general compensation for a switched-capacitor double-integrator biquad

    Publication Year: 1984 , Page(s): 4 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2169 KB)  

    The finite frequency-dependent gain characteristics of operational amplifiers (op amps) is an important limiting factor in the performance of active switched-capacitor filters at high pole frequencies and high quality factors. A compensation scheme is given to reduce transfer-function errors in a switched-capacitor biquad, due to the finite gain-bandwidth product of the op. amps. Experimental and theoretical results show that the scheme is very useful. View full abstract»

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  • 12. New second- and third-order high- and low-pass notches

    Publication Year: 1984 , Page(s): 9 - 11
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (434 KB)  

    A new resistance-capacitance (RC) active circuit is proposed to give a second-order low-pass notch. This can be altered to give a high-pass characteristic, and both can be extended to give third-order notches. The second-order system uses only two capacitors and the third only three. View full abstract»

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  • 13. Realization, compensation, and some applications of single-element tunable differential voltage-controlled current source

    Publication Year: 1982 , Page(s): 11 - 15
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (7099 KB)  

    Describes a tunable differential voltage-controlled current source (DVCCS) realization scheme using operational amplifier (OA) devices. Studies on its design, realizability, and some high-frequency applications are included. Detailed analysis towards the investigation of the high-frequency nonidealities and their appropriate compensation schemes are proposed, employing the one-pole frequency-dependence of the OA devices. Applicabilities of the tunable DVCCS in the high-frequency high-Q tunable inverting/noninverting integrator (TII/TNI) network realization are reported. Significant improvement has been obtained in the integrator quality factors, Q, over the existing schemes, with no effect on tunability. View full abstract»

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  • 14. All-MOS analog/digital conversion techniques — An overview

    Publication Year: 1979 , Page(s): 15 - 21
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1734 KB)  

    MOS LSI technologies have recently shown their potential for use in precision analog to digital and digital to analog converters. This paper will attempt to assess the impact of MOS technology on the cost and performance of the different classes of A/D converter over the next several years. View full abstract»

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  • 15. A classical puzzle: The driving-point resistances of infinite grids

    Publication Year: 1984 , Page(s): 7 - 9
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1340 KB)  

    The driving-point resistance across the diagonal of a square face, or more generally, between any two nodes, of a uniform infinite square grid of 1-Ω resistances is derived. The analysis is for the general case of an n-dimensional resistive grid whose resistors are all the same, or vary in one direction only. View full abstract»

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  • 16. Mayer's and Norton's theorems

    Publication Year: 1982 , Page(s): 14 - 15
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1109 KB)  

    It is a fact that Mayer was the first to publish the construction of a Parallel-Form Equivalent Generator for a given linear network. Perhaps Mayer was inspired by the existence of Thevenin's Series-Form Equivalent Generator. In the United States, the Parallel-Form Generator was independently contributed by E.L. Norton of Bell Telephone Laboratories. However, his theorem was formulated specifically for the time-free periodic steady state, so it was not exactly the same as Mayer's theorem. The first statement of what later became Norton's theorem appeared in an unpublished BTL Patent Application dated November 3, 1926. This was the same month and year that Mayer's theorem was published. View full abstract»

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  • 17. High temperature electronics for geothermal energy

    Publication Year: 1979 , Page(s): 11 - 17
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1464 KB)  

    Instrumentation for geothermal borehole measurements is being expanded beyond today's limited capabilities. Prototype logging tools have been successfully field-tested to 275°C; a high-resolution quartz pressure transducer and a gallium phosphide diode have been successfully tested. Near-term goals of current programs are to develop instrumentation for use at 275° in pressures up to 48.3 MPa (7000 psi). View full abstract»

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  • 18. Volterra series analysis of intermodulation distortion in second-order active filters

    Publication Year: 1983 , Page(s): 4 - 8
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (7833 KB)  

    The nonlinear performance of second-order active filters using single and two operational amplifiers at high frequencies and/or large-signal levels is investigated. A general procedure using the Volterra series is presented to allow comparison of different filter types regarding intermodulation distortion, and to provide means for improvement. Experimental and theoretical results compare favorably, demonstrating the accuracy of the analysis technique. It is shown that intermodulation distortion for single amplifier filters is much larger than for two-amplifier circuits. View full abstract»

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  • 19. Post VLSI technology

    Publication Year: 1980 , Page(s): 22
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (258 KB)  

    It is argued that a `post VLSI technology' will employ some type of `continuum processor' (CP) and will require simultaneous development of a device technology and system design procedures for the technology. View full abstract»

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Aims & Scope

The Circuits and Devices Magazine covers the design, implementation, packaging, and manufacture of micro-electronic and photonic devices, circuits and systems.

 

This Magazine ceased production in 1984. The current retitled publication is IEEE Circuits and Devices Magazine.

Full Aims & Scope