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IEE Colloquium Advanced A-D and D-A Conversion Techniques and Applications

27 May 1993

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Displaying Results 1 - 9 of 9
  • High linearity A/D conversion

    Publication Year: 1993, Page(s):6/1 - 6/5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (188 KB)

    A classification outline is presented for the errors found in an analog to digital converter (ADC). A comparative analysis is given for the errors due to: random noise, nonlinearities, and finite amplitude resolution (quantizing errors). An ADC implementation is then presented which substantially reduces the errors due to nonlinearities and virtually eliminates the quantizing errors. The result is... View full abstract»

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  • Review of optical techniques for A/D and D/A conversion

    Publication Year: 1993, Page(s):7/1 - 7/6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (328 KB)

    In many applications, improved A/D converters are highly desirable. To date such components are all electronic devices, but with the recent dramatic advances in optical techniques, primarily for use in fibre optic telecommunications, it is pertinent to investigate the potential of these to supplement (not replace) electronics in A/D and D/A converters and other high-speed sampling systems. The att... View full abstract»

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  • Design issues for a 20-bit D/A converter based on pulse width modulation and noise shaping

    Publication Year: 1993, Page(s):4/1 - 4/4
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (224 KB)

    A 16-bit quality digital to analogue converter (DAC) using pulse width modulation (PWM) can be realised with near zero harmonic distortion. Noise shaping is employed to reduce the data word length but this interacts (mildly) with the PWM. The system can be extended to handle 20-bit signals, however the interaction becomes so significant that it should be taken into account during design. The two e... View full abstract»

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  • The design and test of a novel wide bandwidth ultrasonic signal acquisition instrument

    Publication Year: 1993, Page(s):8/1 - 8/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (172 KB)

    A fast signal acquisition system for application to ultrasonic instrumentation has been developed which incorporates interleaving and coherent averaging. Interleaving is implemented by controlling the test signal in relation to the sampling clock. This has required development of a test technique using a signal which can be synchronised to the sample clock View full abstract»

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  • Digital and analogue considerations for 24-bit performance from a PWM DAC

    Publication Year: 1993, Page(s):5/1 - 5/5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (232 KB)

    Pushing the performance of PWM converters beyond the 20-bit mark is less than straightforward, partly because of the inherent nonlinearity of PWM. This is a mathematical consequence of the nature of PWM, and can be compensated digitally. As this topic has been extensively discussed , the authors give a rather compressed review. In contrast, the design of the analogue interface, where the stream of... View full abstract»

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  • An analysis of sigma-delta modulators as continuous systems

    Publication Year: 1993, Page(s):3/1 - 3/5
    Cited by:  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (208 KB)

    Introduces a method of analysis for sigma-delta analogue to digital converters based on replacing the nonlinear quantiser with a continuous element. Conventionally, analysis of sigma-delta modulation has been in the discrete domain, often treating the quantiser as a simple additive noise source, which has led to limited success in understanding the processes involved. However, the only truly discr... View full abstract»

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  • Computer-aided design of high order sigma-delta ADCs

    Publication Year: 1993, Page(s):2/1 - 2/5
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (192 KB)

    The methods and application of a software package for the design of high order sigma-delta A/D converters is described. Such tools allow comparisons to be made between sigma-delta converters of different orders and responses. The cost of implementing ADCs is found to be very dependent on the noise and signal transfer functions. The application of the software to the design of a fifth order ADC is ... View full abstract»

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  • Simulation of sigma-delta data converters using SPICE

    Publication Year: 1993, Page(s):1/1 - 1/5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (208 KB)

    Research into sigma-delta based data converters at King's College over the last three years, has focused firstly on the system level optimisation of loop-filter parameters and quantisation level for high-order modulators, and secondly on investigating the potential for adapting either of these to signal characteristics. A high-level representation can be employed directly in both A/D and D/A conve... View full abstract»

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  • IEE Colloquium on `Advanced A-D and D-A Conversion Techniques and Applications' (Digest No.1993/128)

    Publication Year: 1993
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (168 KB)

    The following topics were dealt with: sigma-delta convertors; CAD; PWM; optical techniques; and instrumentation applications View full abstract»

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