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Switched-Capacitor Fractional-Step Butterworth Filter Design

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Abstract

Switched-capacitor fractional-step filter design of low-pass filter prototypes with Butterworth characteristics is reported in this work for the first time. This is achieved using discrete-time integrators which implement both the bilinear and the Al-Alaoui s-to-z transformations. Filters of orders 1.2, 1.5 and 1.8 as well as 3.2, 3.5, and 3.8 are designed and verified using transistor-level simulations with Cadence on AMS \(0.35\,\upmu \)m CMOS process. Digital programmability of the fractional-step filters is also achieved.

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Acknowledgments

This work was supported by Grant E.029 from the Research Committee of the University of Patras (Programme K. Karatheodori).

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Authors and Affiliations

  1. Department of Physics, Electronics Laboratory, University of Patras, Patras, Greece

    C. Psychalinos & G. Tsirimokou

  2. Department of Electrical and Computer Engineering, University of Sharjah, Sharjah, United Arab Emirates

    A. S. Elwakil

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  1. C. Psychalinos
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  2. G. Tsirimokou
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  3. A. S. Elwakil
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Correspondence to A. S. Elwakil.

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Psychalinos, C., Tsirimokou, G. & Elwakil, A.S. Switched-Capacitor Fractional-Step Butterworth Filter Design. Circuits Syst Signal Process 35, 1377–1393 (2016). https://doi.org/10.1007/s00034-015-0110-9

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