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Current mode MOSFET-only third order Butterworth low pass filter with DTMOS tuning technique

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Abstract

A new low-voltage, MOSFET-only, third order low-pass filter is proposed. The circuit employs only MOSFETs operating in saturation region. The transconductance gains and the parasitic gate to source capacitances of the MOSFETs represent resistive and capacitive elements of the filter. Using TSMC 0.18 µm technology parameters the circuit is simulated, non-ideal effects have been investigated and dynamic threshold voltage MOS tuning technique has been developed for the filter circuit to suppress the non-idealities. In this tuning technique, bulk terminals of MOS transistors are used to adjust the biasing point of the circuit by changing the threshold voltages of the MOS transistors. This gives the designers more flexibility than conventional tuning methods and allows low voltage operation when several transistors are stacked over each other. The resulting circuit is capable of operation at high frequencies with low power consumption due to the usage of significantly less number of transistors than conventional active block-based filtering circuits.

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Acknowledgments

The preliminary version of this paper was presented in ELECO 2015 Bursa, Turkey [17]. This work is/was supported by Bogazici University Research Fund Grant Number 10740.

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Authors and Affiliations

  1. Department of Electronics and Communication Engineering, Beykent University, Ayazaga Campus, Sarıyer, 34396, Istanbul, Turkey

    Atilla Uygur

  2. Department of Management Information Systems, Bogazici University, Hisar Campus, Bebek, 34342, Istanbul, Turkey

    Bilgin Metin

  3. Department of Electronics and Communication Engineering, Istanbul Technical University, Ayazaga Campus, Maslak, 34469, Istanbul, Turkey

    Hakan Kuntman

  4. Department of Electrical and Electronic Engineering, Bogazici University, Bebek, 34342, Istanbul, Turkey

    Oguzhan Cicekoglu

Authors
  1. Atilla Uygur
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  2. Bilgin Metin
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  3. Hakan Kuntman
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  4. Oguzhan Cicekoglu
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Correspondence to Bilgin Metin.

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Uygur, A., Metin, B., Kuntman, H. et al. Current mode MOSFET-only third order Butterworth low pass filter with DTMOS tuning technique. Analog Integr Circ Sig Process 89, 645–654 (2016). https://doi.org/10.1007/s10470-016-0798-x

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  • DOI: https://doi.org/10.1007/s10470-016-0798-x

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