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On the design of highly linear CMOS digitally programmable operational transconductance amplifiers for low and high-frequency applications

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Abstract

This paper proposes a novel highly linear digitally programmable fully differential operational transconductance amplifier (DPOTA) circuit. Two versions of the proposed DPOTA structure are designed. The first version is optimized for high-frequency operation with current division networks designated to 3-bit control code words. On the other hand, the second version is optimized for low-frequency operation with 4-bit control code words. The third-order harmonic distortion (HD3) of the first DPOTA version remains below − 66 dB up to 0.4 V differential input voltage at 10 MHz frequency. The second DPOTA version achieved HD3 of − 70 dB with an amplitude of 20 mVp–p and at 100 Hz frequency. The proposed circuits are designed and simulated in 90 nm CMOS model, BSIM4 (level 54) under a balanced 1.2 V supply voltage.

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Authors and Affiliations

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

    Mohamed B. Elamien & Soliman A. Mahmoud

  2. Department of Electrical Engineering, Fayoum University, Fayoum, Egypt

    Soliman A. Mahmoud

Authors
  1. Mohamed B. Elamien
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  2. Soliman A. Mahmoud
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Correspondence to Soliman A. Mahmoud.

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Elamien, M.B., Mahmoud, S.A. On the design of highly linear CMOS digitally programmable operational transconductance amplifiers for low and high-frequency applications. Analog Integr Circ Sig Process 97, 225–241 (2018). https://doi.org/10.1007/s10470-018-1128-2

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  • DOI: https://doi.org/10.1007/s10470-018-1128-2

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