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Insights in Log-Domain Filtering

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Trade-Offs in Analog Circuit Design

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Summary

This chapter has elaborated several issues related to log-domain filters beginning with a discussion of the design philosophy behind the various log-domain synthesis techniques. In contrast to more conventional approaches, the increased mathematical complexity associated with the log-domain technique, and stemming from the exploitation of the large-signal device characteristic, was underlined. The effect of important BJT parasitics (e.g. finite current gain, base and emitter resistances) upon both the transfer functions and the output distortion levels was next addressed, while the impact upon linearity when realizing finite transmission zeros by means of floating capacitors was also explained. The effect of input signal modulation index upon the bandwidth of (nonlinear) currents internal to a log-domain topology was elaborated. The chapter concluded with the intriguing properties of noise in log-domain.

It is genuinely hoped that this chapter can serve as an insightful introduction to a further in-depth study of filtering in the log-domain.

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Author information

Authors and Affiliations

  1. Department of Bioengineering, Imperial College, UK

    Emmanuel M. Drakakis

  2. Department of Electrical and Electronics Engineering, Imperial College, UK

    Alison J. Burdett

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  1. Emmanuel M. Drakakis
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  2. Alison J. Burdett
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Editor information

Editors and Affiliations

  1. Imperial College, UK

    Chris Toumazou

  2. ETH-Zentrum, Switzerland

    George Moschytz

  3. Analog Devices, USA

    Barrie Gilbert

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© 2002 Kluwer Academic Publishers

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Drakakis, E.M., Burdett, A.J. (2002). Insights in Log-Domain Filtering. In: Toumazou, C., Moschytz, G., Gilbert, B., Kathiresan, G. (eds) Trade-Offs in Analog Circuit Design. Springer, Boston, MA. https://doi.org/10.1007/0-306-47673-8_13

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  • DOI: https://doi.org/10.1007/0-306-47673-8_13

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4020-7037-2

  • Online ISBN: 978-0-306-47673-0

  • eBook Packages: Springer Book Archive

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