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IEE Proceedings G - Circuits, Devices and Systems

Issue 2 • Date April 1991

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Displaying Results 1 - 23 of 23
  • Low-frequency noise in GaAs MESFETs related to backgating effects

    Publication Year: 1991, Page(s):175 - 178
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (344 KB)

    The influence of the backgating effect on low-frequency noise in GaAs MESFETs grown by molecular beam epitaxy is investigated. The low-frequency noise is of the 1/f type superimposed on generation-recombination noise. The backgating effect, although it reduces the current, increases current fluctuations and, hence, noise. Furthermore, it is shown that the incorporation of a low-temperature grown G... View full abstract»

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  • Test pattern generation for logic crosstalk faults in VLSI circuits

    Publication Year: 1991, Page(s):179 - 181
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (255 KB)

    Investigates test pattern generation (TPG) for logic circuits in which transient logic errors are likely to be produced by crosstalk interference between nodes. Algebraic and algorithmic approaches for TPG of combinational circuits are presented and applied to several example circuits.<> View full abstract»

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  • CMOS VLSI design of a high-speed Fermat number transform based convolver/correlator using three-input adders

    Publication Year: 1991, Page(s):182 - 190
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (757 KB)

    Three-input addition, modulo a Fermat number F/sub t/, is investigated and a VLSI circuit for a modulo F/sub 4/ three-input adder is proposed, and used in the CMOS VLSI design of a high-speed Fermat number transform (FNT) convolver/correlator. It is shown that, by using three-input modulo F/sub t/ addition, substantial improvements in the performances of both the modulo F/sub t/ multiplier and the... View full abstract»

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  • Testing for stuck faults in CMOS combinational circuits

    Publication Year: 1991, Page(s):191 - 197
    Cited by:  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (525 KB)

    In the paper, a new transistor model is developed with which to examine the behaviour of static CMOS circuits using a logic transistor function (LTF). The LTF is a Boolean representation of the circuit output in terms of its input variables and its transistor topology. The LTF is automatically generated using the path algebra technique. The faulty behaviour of the circuit can be obtained from the ... View full abstract»

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  • Design of a multimesa IMPATT diode array optimised for maximum heat dissipation

    Publication Year: 1991, Page(s):198 - 204
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (535 KB)

    It is shown that an appreciable increase in the dissipation capabilities of an IMPATT diode can be achieved by making it in the form of a multimesa array structure on a common substrate, which forms the cathode connection. The anode of each mesa diode is connected through an integrated gold heatsink to a common large external copper heatsink. A complete thermal analysis is performed by numerical t... View full abstract»

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  • New nonlinear large-signal DC bipolar junction transistor model

    Publication Year: 1991, Page(s):145 - 150
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (436 KB)

    A new DC nonlinear large-signal model for the bipolar junction transistor is described, together with the procedures for estimating its parameters. The main advantage of the new model over existing models is its very simple parameter estimation procedures. This produces high accuracy with very minor parameter optimisation effort. A further important feature of the model is that it is expandable so... View full abstract»

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  • When do singular inputs of an LTI system not cause discontinuities in state variables?

    Publication Year: 1991, Page(s):151 - 154
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (210 KB)

    Considers the following question: when do the regular parts of state variables of an LTI system remain continuous functions, regardless of the presence of a singular part in the inputs. A simple test, which gives an answer to the above question, before solving this system, is presented.<> View full abstract»

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  • Charge injection of analogue CMOS switches

    Publication Year: 1991, Page(s):155 - 159
    Cited by:  Papers (12)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (481 KB)

    The clock-feedthrough phenomenon in sample-and-hold circuits using complementary MOS transistor switches is discussed in detail. The analysis starts with a generalised clock-feedthrough formula for the single MOS switch and is extended to a discussion of the basic CMOS sample-and-hold circuit operated over a wide signal and clock delay range. Simple formulas for the estimation of the clock feedthr... View full abstract»

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  • Impulse response signature of a DCEL ZnS:Mn,Cu powder display determined by crosscorrelation

    Publication Year: 1991, Page(s):160 - 164
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (318 KB)

    The voltage-luminous intensity transfer function for DC electroluminescence (DCEL) ZnS:Mn,Cu powder display panels has been determined by impulse response testing using crosscorrelation techniques. The investigation has revealed a signature characteristic featuring evidence of an internal feedback mechanism which is a function of the mean voltage causing luminescence. It has further shown that the... View full abstract»

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  • Gummel-Poon model for single and double heterojunction bipolar transistors

    Publication Year: 1991, Page(s):165 - 169
    Cited by:  Papers (4)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (377 KB)

    An analytical model for single and double heterojunction bipolar transistors has been developed by employing the concepts of the Gummel-Poon model. The equations for injected minority carrier concentrations are developed based on the thermionic diffusion theory. Linking current and total charges in the base are calculated. The Early voltages are treated as functions of the applied voltages rather ... View full abstract»

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  • Low-frequency gain-enhanced CMOS operational amplifier

    Publication Year: 1991, Page(s):170 - 174
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (355 KB)

    To achieve a high gain in a CMOS operational amplifier is difficult because of the inherent low transconductance of MOS transistors. In the paper, a gain-enhanced CMOS operational amplifier that uses a modified differential input stage is presented. The proposed input stage is derived from a cascode differential amplifier and provides a gain improvement of 16 dB over that of the cascode stage. The... View full abstract»

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  • Technique allowing rapid frequency sweeping in aided-acquisition phase-locked loops

    Publication Year: 1991, Page(s):205 - 209
    Cited by:  Papers (1)  |  Patents (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (343 KB)

    Phase-locked loops employing analogue phase detectors have a capture range limited to several times the loop natural frequency. In many applications this is insufficient to accommodate the likely frequency variation of the signal to which the loop is locked, and so a sweeping technique is used to aid the acquisition process. However, the rate at which the loop may be swept is also dependent on the... View full abstract»

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  • CCII-based continuous-time filters with reduced gain-bandwidth sensitivity

    Publication Year: 1991, Page(s):210 - 216
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (460 KB)

    Some new MOSFET-C integrators and CMOS current conveyors for realisations of ladder filters are proposed. These integrators require smaller capacitance than those currently used. The integrators also provide a better high-frequency performance in terms of gain and phase error responses. A sixth-order bandpass ladder filter, with 460 kHz centre frequency, 0.5 dB ripple, and ripple bandwidth 120 kHz... View full abstract»

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  • Symbolic transfer functions for MESFET small-signal parameter extraction

    Publication Year: 1991, Page(s):217 - 221
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (300 KB)

    The author describes a technique whereby directed graphs can be used to represent the interactions within an active microwave device, described by means of a lumped equivalent circuit. Analytical transfer functions representing the two-port scattering parameter matrix are evaluated. These are then used in a robust, automatic small-signal parameter estimation scheme. The resulting device equivalent... View full abstract»

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  • Canonical design of integrated ladder filters

    Publication Year: 1991, Page(s):222 - 228
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (471 KB)

    Necessary conditions are given for the existence of a one-opamp-per-pole (canonical) realisation of a transfer function by an active ladder filter designed by operational simulation methods. The parity of the transfer function is shown to be critical. Some new design methods are applied to guarantee canonical low-sensitivity realisation of hitherto problematic filter types. These ensure a uniform ... View full abstract»

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  • Low-sensitivity structure for 1-D and 2-D digital FIR filters

    Publication Year: 1991, Page(s):229 - 233
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (330 KB)

    A nonrecursive structure of 1-D and 2-D FIR lowpass and highpass digital filters is described in the paper. The magnitude sensitivity is small and zero sensitivity can be obtained at particular frequencies in the passbands. The structure is canonical in the sense of the number of multipliers. The reductions of the structure due to the symmetries of the impulse response are applicable as is usual w... View full abstract»

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  • Genetic algorithm in the design of FIR filters

    Publication Year: 1991, Page(s):234 - 238
    Cited by:  Papers (29)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (389 KB)

    The author's aim is to describe a method of designing finite impulse response (FIR) filters that is automatic, rapid, and gives filter realisations of near minimal computational complexity. Existing methods of filter design are reviewed to show that none possesses all these features. These methods include recent work using a sequential algorithm that produces realisations of guaranteed minimum com... View full abstract»

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  • Single chip 500 MHz function generator

    Publication Year: 1991, Page(s):239 - 243
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (405 KB)

    The authors describe a single-chip, digitally synthesised, analogue function generator. The device uses the 'direct frequency synthesis' (DFS) approach. It is expected to find applications in instrumentation, radar and electronic warfare. It has a capability for the generation of sine, triangle and square waves from 1 Hz to 500 MHz, with a minimum frequency increment of 1 Hz.<> View full abstract»

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  • Maximally-flat rational approximation with multiple critical pole-pair

    Publication Year: 1991, Page(s):244 - 252
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (682 KB)

    The class of lowpass rational transfer functions, with a multiple critical pole-pair, equiripple in the stopband and maximally flat at the origin, is investigated and tables of poles and zeros of an adequate number of functions are supplied. With respect to the classical inverse-Chebyshev functions, the proposed functions allow the solution of the approximation problem, with a remarkable reduction... View full abstract»

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  • Inductive fault analysis revisited (integrated circuits)

    Publication Year: 1991, Page(s):253 - 263
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (950 KB)

    The principles of inductive fault analysis (IFA), a technique for the determination of a list of the possible faults in an integrated circuit, ranked according to their probability of occurrence, are reviewed and criticised. It is pointed out that IFA should be upgraded to achieve reasonable flexibility in dealing with different MOS technologies and that the Monte Carlo approach, used for determin... View full abstract»

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  • High-fidelity finite-impulse-response filters with optimal stopbands

    Publication Year: 1991, Page(s):264 - 272
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (782 KB)

    The author describes a method of designing a high-fidelity lowpass finite-impulse-response (FIR) filter having a maximally flat passband and an optimally contoured stopband in the Chebyshev sense. Certain other filters can be derived from it, including a lowpass filter with an equirippled passband and a maximally flat stop band.<> View full abstract»

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  • SPICE simulation of nonlinear equations and circuits

    Publication Year: 1991, Page(s):273 - 281
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (481 KB)

    Based on the SPICE 2G6 program some techniques of simulation of algebraic functions and nonlinear equations are introduced. These techniques are used to solve practical problems encountered in the design of nonlinear circuits. The need for mixed equation and circuit simulation is also described. An example of mixed simulation is implemented to demonstrate the capability and practicality of this ty... View full abstract»

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  • Use of SPICE in analogue computation and simulation of systems consisting of circuit components and transfer functions

    Publication Year: 1991, Page(s):282 - 288
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (390 KB)

    Based on the SPICE2G6 program, methods of generating analogue functions, such as integration, simple poles and zeros, complex poles and zeros, are introduced. These functions are used for the modelling and simulation of nonlinear and time-dependent differential equations. Mixed simulation of circuit components and analogue transfer functions is also studied. Mixed simulation allows the circuit des... View full abstract»

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