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Two-stage unbuffered CFOA based non-inverting resistive-feedback amplifier: a study based on the description of the operational transconductance conveyor (OTC)

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Abstract

A study of the non-inverting amplifier based on a two stages CMOS unbuffered current-feedback-operational-amplifier (UCFOA) is proposed in this paper. Using a small-signal equivalent circuit (macro-model) of the non-inverting amplifier, a theoretical explanation of the closed loop gain is given. The opamp phase margin and its bandwidth have been estimated from the quality factor Q of resonance and using a novel description of the UCVFOA input stage called Operational Transconductance Conveyor (OTC). The OTC description can be seen as an extension of type II second generation current conveyors. Based on the fundamental parameters of the proposed OTC, a theoretical approach given in this paper explains how to evaluate precisely the value of the UCFOA compensation capacitance. PSPICE was used to simulate both the theoretical macro-model and the CMOS configuration from a 0.35 μm typical BSIM3V3 transistor models.

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Authors and Affiliations

  1. IM2NP – UMR 7334, Université de Toulon, 83957, La Garde Cedex, France

    Hervé Barthélemy & Valentin Giès

  2. IM2NP – UMR 7334, Aix-Marseille Université, 38, Rue Joliot Curie, 13451, Marseille Cedex 20, France

    Remy Vauché & Jean Gaubert

  3. IMEP-LAHC, Grenoble INP – Minatec, 3 Parvis Louis Néel, BP 50 257, 38016, Grenoble Cedex, France

    Sylvain Bourdel

Authors
  1. Hervé Barthélemy
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  2. Remy Vauché
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  3. Valentin Giès
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  4. Sylvain Bourdel
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  5. Jean Gaubert
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Correspondence to Hervé Barthélemy.

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Barthélemy, H., Vauché, R., Giès, V. et al. Two-stage unbuffered CFOA based non-inverting resistive-feedback amplifier: a study based on the description of the operational transconductance conveyor (OTC). Analog Integr Circ Sig Process 97, 243–252 (2018). https://doi.org/10.1007/s10470-018-1219-0

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  • DOI: https://doi.org/10.1007/s10470-018-1219-0

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