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IEE Proceedings - Circuits, Devices and Systems

Issue 3 • Date Jun 1994

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Displaying Results 1 - 16 of 16
  • Power-source element and its properties

    Publication Year: 1994, Page(s):220 - 226
    Cited by:  Papers (21)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (324 KB)

    A power-source element is defined and its properties are studied. The power source describes the output characteristics of the loss-free resistor, as well as high quality rectifiers, some types of switched-mode convertors, and other loss-less two-ports. It is shown that controlled power sources are inherent in the large class of buffered power-conservative two-port networks. This approach has insp... View full abstract»

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  • Maximum frequency and optimum performance of class E power amplifiers

    Publication Year: 1994, Page(s):174 - 184
    Cited by:  Papers (44)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (472 KB)

    An analytical method is proposed to discuss class E RF power amplifiers with finite choke inductors. All parameters in these amplifiers can be expressed in terms of circuit-component values and amplifier specifications. The component values of class E amplifiers required to achieve optimum amplification can be directly obtained after the amplifier specifications are fixed. An obvious relationship ... View full abstract»

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  • Differential-current derived feedback in error-correcting audio amplifier applications

    Publication Year: 1994, Page(s):227 - 236
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1252 KB)

    A dominant distortion mechanism in audio power amplifiers results from nonlinearity in the voltage and current transfer functions within the power output stage. A technique is presented that uses a magnetic differential sensor to sense this distortion and to apply a supplementary error-correcting feedback path within the amplifier, in addition to overall negative feedback. Differential-current der... View full abstract»

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  • Optimisation of signal phase split in vector modulator phase shifters

    Publication Year: 1994, Page(s):207 - 209
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (208 KB)

    Choosing a phase split larger than 90° influences the output characteristics of a vector modulator operated as a continuous phase shifter. It is shown that for a vector modulator with a phase split larger than 90°, less amplitude variation is required to achieve a specified phase range as compared to a conventional design with a split of 90°. Analytical expressions are given for phase ... View full abstract»

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  • Modelling of propagation delays in the bilevel crossing interconnections on the GaAs-based integrated circuits

    Publication Year: 1994, Page(s):185 - 192
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (412 KB)

    A computer-efficient model of the propagation delays in the bilevel crossing interconnections on the GaAs-based very high speed integrated circuits (VHSICs) has been developed. The interconnections on the first and second levels are modelled by a combination of lumped circuit parameters and distributed circuit transmission lines. The ground and coupling capacitances used in the model were determin... View full abstract»

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  • Consideration of multiplexing in neural network hardware

    Publication Year: 1994, Page(s):237 - 240
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (308 KB)

    This paper presents the results of research into a scheme for overcoming the communications `bottleneck' within hardware neural networks, utilising frequency division multiplexing of amplitude modulated neural signals. The introduction explains the problem of connectivity in neural networks and the need for multiplexing, followed by an introduction to the FDM solution. A comparison of FDM with TDM... View full abstract»

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  • Analysis of a composite amplifier technique for optimum noise performance

    Publication Year: 1994, Page(s):210 - 214
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (344 KB)

    A technique for combining two voltage-operational amplifiers to create a single composite-voltage operational amplifier (VOA) is analysed. The composite amplifier can be treated essentially as a single VOA which gives an optimum combination of the DC and AC performances of the two constituent amplifiers. Specific practical examples of the technique have been previously reported, but in this paper ... View full abstract»

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  • Theoretical and experimental evaluation of high-voltage CMOS inverters

    Publication Year: 1994, Page(s):162 - 166
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (280 KB)

    A high-voltage CMOS technology featuring a 45 V maximum blocking voltage is described. The transistor output characteristics at high voltages are simulated by employing an impact-ionisation current model and the results are verified by measurements on fabricated test structures. Proper inverter operation is maintained up to a supply voltage of 35 V, despite a large impact-ionisation-induced mismat... View full abstract»

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  • Effect of X-ray irradiation on submicrometre channel length MOSFETs

    Publication Year: 1994, Page(s):193 - 196
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (224 KB)

    n-MOSFETs of channel lengths varying from 0.5 μm to 4.0 μm were exposed to X-ray radiation of doses between 3 Mrad (SiO2) and 8 Mrad (SiO2). The degradation of threshold voltage showed that there is a `rebound' effect. This phenomena is observed because of the positive charges saturating at doses much lower than the ~24 Mrad (SiO2) observed for thick oxides a... View full abstract»

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  • High frequency and high resolution capacitance measuring circuit for process tomography

    Publication Year: 1994, Page(s):215 - 219
    Cited by:  Papers (19)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (272 KB)

    A stray-immune AC capacitance measuring circuit has been developed for electrical capacitance tomography. For this application a high excitation frequency is essential to achieve high sensitivity and fast data collection rates, and also to reduce the effect of any conductive component in parallel with the measured capacitance. A high excitation frequency has been made possible by using some novel ... View full abstract»

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  • New formulations to describe translinear mixed cells accurately

    Publication Year: 1994, Page(s):167 - 173
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (384 KB)

    New formulations are introduced that are able to describe more accurately translinear mixed cells with eight bipolar transistors (i.e. with both PNPs and NPNs) consisting of four-transistor mixed loops and cascode stages. These general expressions can be used for all the various configurations of the cell. Their coefficients, which depend on the arrangement of the circuit, are calculated very easi... View full abstract»

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  • Leap-frog circuit compensating influence of GB product and second pole of operational amplifier

    Publication Year: 1994, Page(s):203 - 206
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (204 KB)

    The paper describes a method by which a high frequency leap-frog filter which simulates an LC filter is designed. First, taking account of the finite gain bandwidth product and the second pole of an operational amplifier, we analyse the frequency characteristics of a conventional inverting integrator. Second, we analyse the frequency characteristic of a phase-lead noninverting integrator and show ... View full abstract»

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  • CMOS shunt regulator with bandgap reference for automotive environment

    Publication Year: 1994, Page(s):157 - 161
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (356 KB)

    A temperature-stable shunt regulator for automotive environments using standard digital CMOS technology is described. The new technique employed to implement the bandgap reference cell reduces the influence of the high offset input voltages present in the CMOS op-amps and allows for a simple and cost-effective design of a nontrimmed chip with good temperature characteristics. The shunt regulator o... View full abstract»

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  • Two-level partitioning algorithm with stable performance

    Publication Year: 1994, Page(s):197 - 202
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (380 KB)

    By using the concept of `divide-and-conquer' the complexity of a large problem can be reduced efficiently. Therefore, logic partitioning plays an important role in many aspects of VLSI design. The ratio cut objective function has attracted much attention because it coordinates the two traditional goals of logic partitioning, mincut and equipartition, automatically. How to reduce the total trials n... View full abstract»

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  • Fast peak detector for variable frequency three-phase sinusoidal signals

    Publication Year: 1994, Page(s):151 - 156
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (320 KB)

    A fast peak detector for three-phase variable frequency sinusoidal signals is proposed. This novel detector fully uses the three-phase characteristic to achieve instantaneous response and frequency independence characteristics. Moreover, the proposed detector possesses excellent linearity and low sensitivity to small voltage unbalance and harmonic distortion. Because of its promising accuracy and ... View full abstract»

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  • Integrated fourth-order ΣΔ convertor with stable self-tuning continuous-time noise shaper

    Publication Year: 1994, Page(s):145 - 150
    Cited by:  Papers (2)  |  Patents (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (404 KB)

    A fourth-order monolithic ΣΔ convertor is presented. The circuit shows how it is possible to use a completely continuous-time noise shaper with integrated passive components, moving the sampling function to the output of the filter. The associated uncertainty in the fabricated time constants, which is a serious problem in such a high-order design, is made negligible by means of a self ... View full abstract»

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