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Electronic Filters, IEE Colloquium on

Date 9 Jun 1989

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Displaying Results 1 - 15 of 15
  • Active noise filter

    Publication Year: 1989, Page(s):2/1 - 2/3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (108 KB)

    An active filter circuit is described which endeavours to remove the phase noise component by using a high gain negative feedback loop. The feedback component is applied in antiphase. The active filter circuit employs a novel input signal with combined phase and frequency information View full abstract»

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  • Design of active filters for simultaneously optimised noise and sensitivity

    Publication Year: 1989, Page(s):1/1 - 1/5
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (180 KB)

    Generalised analysis of second-order single-amplifier filter sections with two free passive parameters leads to exact optimisation of both sensitivity and noise performance. This resolves a longstanding discrepancy in the literature and permits practical trade-offs in design. Noise levels are also compared with those of multiple-amplifier filters View full abstract»

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  • Stable adaptive filters: the design domain

    Publication Year: 1989, Page(s):10/1 - 10/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (160 KB)

    Considers a method for the design of stable infinite impulse response (IIR) filters, which are guaranteed to remain stable under adaptation. The reasons for selecting an IIR filter configuration are twofold. In the frequency domain, an IIR filter will generally exhibit a much sharper selectivity than a finite impulse response (FIR) filter of the same complexity. In the time domain, a small size II... View full abstract»

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  • Chaotic signals generated by overflow nonlinearities in digital-filters

    Publication Year: 1989, Page(s):8/1 - 8/6
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (280 KB)

    A second-order discrete-time system with a sawtooth nonlinearity can exhibit dynamic chaos, which is a form of response much more complex than a periodic limit-cycle. This paper discusses the manner in which such waveforms arise, with illustrations obtained from interactive software developed to investigate and demonstrate these phenomena View full abstract»

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  • A 29 GHz microstrip end-coupled filter

    Publication Year: 1989, Page(s):6/1 - 6/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (128 KB)

    This paper outlines a procedure for the design of end-coupled microstrip bandpass filters at near mm-wave frequencies. It presents results obtained for a 28.76 GHz filter which yields an insertion loss of 2.3 dB in the passband and 30 dB rejection at 4% below the centre frequency View full abstract»

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  • The effects of real and complex zero locations on the transient response of equi-ripple filters

    Publication Year: 1989, Page(s):14/1 - 14/6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (232 KB)

    Illustrates a number of transient responses, giving step and impulse responses for some band pass filters and for a wide variety of low pass filters. In particular, filters which contain real and complex zeros are shown here as having intermediate response which can show a gradual change in shape when going from one order to the next. The discussion is not restricted to passive LC cases and is app... View full abstract»

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  • High frequency active filters using OTAs

    Publication Year: 1989, Page(s):3/1 - 3/5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (152 KB)

    A novel second-order low-pass active filter based on the OTA is presented. In addition to its simplicity, the filter exhibits other attractive features, such as the use of grounded equal value capacitors and low sensitivity to the passive components and OTA bandwidth View full abstract»

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  • A design algorithm for all-pass delay equalisers

    Publication Year: 1989, Page(s):11/1 - 11/8
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (172 KB)

    Modern digital communications and signal processing systems require filters which satisfy simultaneous specifications on amplitude and group delay. A common practical approach to the design of such filters is to approximate the amplitude specifications by a minimum phase function and then to equalise the group delay by an all-pass function. In this paper a new computer method for the design of all... View full abstract»

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  • Quantisation effects in FIR filters: fixed versus floating point

    Publication Year: 1989, Page(s):9/1 - 9/8
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (240 KB)

    Floating point implementations are more complex than fixed point (by a factor of up to three for typical hardware realisations), but are generally assumed to offer reduced quantisation errors. In this contribution a comparison is made between the use of fixed and floating point arithmetic for FIR filters. It is argued that in many applications the performance of the simpler fixed point arithmetic ... View full abstract»

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  • The primitive operator graph synthesis technique: application to one and two dimensional digital filters

    Publication Year: 1989, Page(s):7/1 - 7/8
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (232 KB)

    This contribution reviews the previous work of the authors in the area of reduced complexity realisations of digital filters. The work is extended here to demonstrate how the graphical techniques employed may be adapted for use in a wider range of signal processing applications View full abstract»

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  • IEE Colloquium on `Electronic Filters' (Digest No.97)

    Publication Year: 1989
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (12 KB)

    The following topics were dealt with: active filters; OTAs; microstrip filters; optimal filtering; digital filters; FIR; IIR; adaptive filters; SC filters; CAD View full abstract»

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  • Generalisation and evaluation of second-order analogue OTA-C filters

    Publication Year: 1989, Page(s):4/1 - 4/4
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (128 KB)

    New second-order canonical OTA-C filters are generated from signal-flow graphs and accurately evaluated by comprehensive linear and nonlinear device modelling View full abstract»

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  • An intentionally approximate bilinear based transform

    Publication Year: 1989, Page(s):12/1 - 12/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (180 KB)

    Over the last few years the bilinear transform has become established as the major transform for SC filters synthesis. Mathematically exact realizations of bilinearly transformed passive template filter have been developed. But these realizations, while having the advantage of being exact (and thus correct by design) generally suffer from unnecessarily complex topologies. For example, the standard... View full abstract»

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  • Optimal filtering of digital PPM transmitted over optical fibre channels

    Publication Year: 1989, Page(s):5/1 - 5/5
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (224 KB)

    The abundance in bandwidth available in the best monomode fibres may be exchanged for improved receiver sensitivity by employing digital PPM. In this paper the authors derive an optimal filter for a digital PPM coding scheme operating over a fibre channel employing a PIN-BJT receiver. Experimental results obtained at a data rate of 8 Mbit/s show that the digital PPM system offers an improvement of... View full abstract»

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  • Automatic filter design: the development of a CAD system

    Publication Year: 1989, Page(s):13/1 - 13/5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (152 KB)

    Describes the results of a project jointly funded by British Telecom and the SERC to create a user friendly filter design system. The system can be easily used by people who have some knowledge of filters but are not experienced in the techniques of filter synthesis. The project has concentrated on the synthesis of LC ladder filters. The user is not involved in unnecessary details of the approxima... View full abstract»

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