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Prototype and Synthesis of Active Filters

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Continuous-Time Low-Pass Filters for Integrated Wideband Radio Receivers

Part of the book series: Analog Circuits and Signal Processing ((ACSP))

Abstract

At the very beginning of the filter design, an appropriate filter transfer function and the order of the filter have to be selected. In radio receivers, the bandwidth and, particularly, the selectivity requirement for channel-select and anti-aliasing filtering are determined by the wireless application being targeted, the specified or expected interferers scenario, and the performance of the ADC, as discussed in Chap. 2. The bandwidth and selectivity requirements of the analog baseband filter further depend on the receiver architecture adopted and the preceding filter stages. The filter transfer function and the order of the filter are then chosen according to the given selectivity requirement. In addition, for example, the passband flatness and phase response characteristics that are required have to be taken into account. In active filter implementations, the minimization of filter stages (i.e. the order of the filter) is typically beneficial in terms of noise, power consumption, and complexity. Therefore, it is important also to consider the feasibility of the active filter realization, as well as the performance requirements set for the filter block, before finally deciding on the filter prototype.

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Notes

  1. 1.

    Portions of this section are taken from [18] (Copyright © 2007 IEEE. All rights reserved. Reprinted with permission), [19] (Copyright © 2007 IEEE. All rights reserved. Reprinted with permission) and [20] (Copyright © 2009 IEEE. All rights reserved. Reprinted with permission).

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Author information

Authors and Affiliations

  1. EPCOS Nordic Oy, Espoo, Finland

    Ville Saari

  2. Electronic Circuit Design Unit School of Electrical Engineering Department of Micro- and Nanosciences, Aalto University, Espoo, Finland

    Jussi Ryynänen

  3. Texas Instruments, Helsinki, Finland

    Saska Lindfors

Authors
  1. Ville Saari
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  2. Jussi Ryynänen
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  3. Saska Lindfors
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Saari, V., Ryynänen, J., Lindfors, S. (2012). Prototype and Synthesis of Active Filters. In: Continuous-Time Low-Pass Filters for Integrated Wideband Radio Receivers. Analog Circuits and Signal Processing. Springer, Boston, MA. https://doi.org/10.1007/978-1-4614-3366-8_4

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  • DOI: https://doi.org/10.1007/978-1-4614-3366-8_4

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  • Print ISBN: 978-1-4614-3365-1

  • Online ISBN: 978-1-4614-3366-8

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