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IEE Proceedings G - Circuits, Devices and Systems

Issue 2 • April 1990

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Displaying Results 1 - 14 of 14
  • Programmable current-mode neural network for implementation in analogue MOS VLSI

    Publication Year: 1990, Page(s):175 - 178
    Cited by:  Papers (12)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (806 KB)

    The authors present simple and efficient circuit techniques for the implementation of feedback and feedforward neural networks in analogue MOS VLSI. Synaptic weight storage is achieved using programmable threshold-voltage devices, such as the metal-nitride-semiconductor transistor and the floating-gate MOS transistor. Basic electronic neural functions, such as adaptive weighted summation and sigmo... View full abstract»

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  • A high performance CMOS compatible 8-bit current scaling D/A convertor

    Publication Year: 1990, Page(s):169 - 174
    Cited by:  Papers (3)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (569 KB)

    An 8-bit current scaling D/A convertor has been implemented in a standard 3 mu m p-well CMOS process. This convertor requires an active area of 1 mm/sup 2/ and is capable of operating at full scale currents ranging from 50 nA to 1 mA. High linearity at low full-scale (FS) currents is achieved by using CMOS compatible lateral bipolar transistors rather than MOS transistors or precision resistors to... View full abstract»

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  • Algorithmic analogue-to-digital convertors using current-mode techniques

    Publication Year: 1990, Page(s):163 - 168
    Cited by:  Papers (4)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (470 KB)

    Algorithmic ADCs designed using current mode techniques are presented. The current mode techniques do not require large supply voltages and reduce the need for high quality amplifiers and large linear capacitors on which to store the signal. Consequently, the resulting ADCs can be made very small while still providing high sampling rates. In this paper a variety of different circuit structures use... View full abstract»

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  • Switched current filters

    Publication Year: 1990, Page(s):156 - 162
    Cited by:  Papers (44)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (491 KB)

    'Switched Currents' is a new analogue sampled-data signal processing technique that can be implemented without the need for linear floating capacitors. This feature enables signal processors to be integrated in a standard digital VLSI process (CMOS), making the technique ideally suited for mixed analogue/digital ICs. Switched current cells are described, and a configuration for a universal integra... View full abstract»

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  • Continuous-time and switched capacitor monolithic filters based on current and charge simulation

    Publication Year: 1990, Page(s):147 - 155
    Cited by:  Papers (4)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (661 KB)

    The authors are concerned with high precision analogue filters for integrated circuit implementation that use current or charge variables to simulate low sensitivity LCR filters instead of voltages. The filters are regarded as interconnections of integrators that are themselves based on transconductors that can be realised by both continuous time and switched capacitor circuit techniques. Factors ... View full abstract»

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  • Operational floating amplifier

    Publication Year: 1990, Page(s):131 - 136
    Cited by:  Papers (19)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (415 KB)

    The operational floating amplifier (OFA) is the most general 'nullor' implementation, which is a basic active two-port network element. The definition, applications, and design of OFAs are described. The OFA accurately equates two voltages connected to the terminals of the input port, like a standard operational amplifier, but in addition, an OFA accurately equates two currents connected to the te... View full abstract»

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  • Extending voltage-mode op amps to current-mode performance

    Publication Year: 1990, Page(s):116 - 130
    Cited by:  Papers (25)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1163 KB)

    The authors review techniques for extending the output capabilities of conventional voltage-mode operational amplifiers to achieve current-mode performance. Tracing the development over the past two decades, a number of elegant and useful circuit topologies for realising amplifiers with controlled current output properties are described. In particular, the operational amplifier supply current sens... View full abstract»

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  • Design and application of GaAs current mirror circuits

    Publication Year: 1990, Page(s):101 - 108
    Cited by:  Papers (12)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (515 KB)

    The authors present a simple, high performance circuit for an inverting, voltage following current mirror suitable for gallium arsenide technology. Cascoding techniques are introduced to achieve accurate current ratios and low parasitic conductance elements. The applications of the current mirror in the design of high gain, fast settling operational amplifiers and in a differential to single ended... View full abstract»

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  • Basic principles of accurate dynamic current mirrors

    Publication Year: 1990, Page(s):95 - 100
    Cited by:  Papers (20)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (474 KB)

    Basic principles and limitations of accurate dynamic current mirrors based on dynamic analogue techniques are presented. The accuracy of dynamic current mirrors is independent of the mismatch of the transistors comparing the mirror, because of the same transistor is sequentially used at the input and the output of the mirror. Limitation of such dynamic current mirrors and the influence of clock ph... View full abstract»

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  • Accurate current conveyor topology and monolithic implementation

    Publication Year: 1990, Page(s):88 - 94
    Cited by:  Papers (10)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (469 KB)

    A new current conveyor topology based on an innovative connection of Wilson current mirrors is presented. It offers significant enhancements in the areas of accuracy, frequency bandwidth, transient response, output impedance and distortion. The performance of an integrated circuit implementation of this configuration, fabricated on a complementary npn-pnp bipolar process is also described.<> View full abstract»

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  • The current conveyor: history, progress and new results

    Publication Year: 1990, Page(s):78 - 87
    Cited by:  Papers (108)  |  Patents (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (747 KB)

    With the growing interest in current-mode analogue circuits, an historical account of the invention of the current conveyor is given. Some observations are made on the progress in its realisation and application over the past two decades. New results on the monolithic implementation of the current conveyor are presented.<> View full abstract»

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  • Recent developments in current conveyors and current-mode circuits

    Publication Year: 1990, Page(s):63 - 77
    Cited by:  Papers (143)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1533 KB)

    Current conveyors and related current-mode circuits have begun to emerge as an important class of circuits with properties that enable them to rival their voltage-mode counterparts in a wide range of applications. The use of current rather than voltage as the active parameter can result in higher usable gain, accuracy and bandwidth due to reduced voltage excursion at sensitive nodes. A current-mod... View full abstract»

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  • A comprehensive simulation macromodel for `current feedback' operational amplifiers

    Publication Year: 1990, Page(s):137 - 145
    Cited by:  Papers (7)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (512 KB)

    A SPICE compatible macromodel has been devised for the simulation of `current feedback' type operational amplifiers. Since the major advantage of this type of amplifier is high speed, the emphasis is on the accurate prediction of AC characteristics. A practical example is given, together with a comparison of measured and simulated performance View full abstract»

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  • Operation and analysis of current copier circuits

    Publication Year: 1990, Page(s):109 - 115
    Cited by:  Papers (18)  |  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (396 KB)

    A detailed analysis of the performance of current copier circuits is presented. These circuits allow the sampling, holding and reproduction of practically identical copies of a current without relying on the matching of circuit elements. The analysis is confirmed both by simulation results and by tests of an experimental MOS IC. Applications of these circuits include signal processors, A/D and D/A... View full abstract»

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