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A single-stage operational amplifier with enhanced transconductance and slew rate for switched-capacitor circuits

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Abstract

In this paper, a single-stage multi-path operational amplifier for fast-settling switched-capacitor circuits is presented. The proposed amplifier uses all idle devices in the conventional folded-cascode amplifier in the signal path and the positive feedback cross-coupled transistors to enhance both the small-signal and large-signal parameters. It significantly improves the DC gain, unity-gain bandwidth, and slew rate compared to the conventional folded-cascode amplifier with the same power consumption and input parasitic capacitance. Extensive circuit level analysis and simulation results using a 90 nm CMOS technology are provided to evaluate the usefulness of the proposed amplifier.

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Authors and Affiliations

  1. Integrated Circuits Design Laboratory, Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran

    Mohammad Yavari & Tohid Moosazadeh

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  1. Mohammad Yavari
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  2. Tohid Moosazadeh
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Correspondence to Mohammad Yavari.

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Yavari, M., Moosazadeh, T. A single-stage operational amplifier with enhanced transconductance and slew rate for switched-capacitor circuits. Analog Integr Circ Sig Process 79, 589–598 (2014). https://doi.org/10.1007/s10470-014-0292-2

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  • DOI: https://doi.org/10.1007/s10470-014-0292-2

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