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Rail-to-rail BiCMOS operational amplifier using input signal adapters with floating outputs

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Abstract

An operational amplifier with rail-to-rail input and output voltage range in 0.6 μm BiCMOS technology is presented. Two simple input signal adapters with floating outputs serving as pre-stages are introduced. They are followed by a differential amplifier. The adapters translate the input signals into a floating level within the operating region of the differential amplifier, enabling rail-to-rail operation. An inverter-based simple rail-to-rail class AB output stage has been used. With a single supply of 1.5 V, the proposed rail-to-rail operational amplifier achieves 72 dB DC open-loop gain, 2.54 MHz unity-gain frequency, 62° phase margin, 2.5 V/μs slew rate, and 147 μW power consumption.

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Acknowledgments

The authors would like to thank the Austrian Science Fund (FWF) for funding, and A. Marchlewski for noise simulations.

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Authors and Affiliations

  1. Institute of Electrodynamics, Microwave and Circuit Engineering, Vienna University of Technology, Gusshausstrasse 25/354, 1040, Vienna, Austria

    Nikša Tadić, Franz Schloegl & Horst Zimmermann

  2. Faculty of Electrical Engineering, University of Montenegro, Cetinjski put bb, 81000, Podgorica, Montenegro

    Mirjana Banjević

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  1. Nikša Tadić
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  2. Mirjana Banjević
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  3. Franz Schloegl
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  4. Horst Zimmermann
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Correspondence to Nikša Tadić.

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Tadić, N., Banjević, M., Schloegl, F. et al. Rail-to-rail BiCMOS operational amplifier using input signal adapters with floating outputs. Analog Integr Circ Sig Process 63, 433–449 (2010). https://doi.org/10.1007/s10470-009-9423-6

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  • DOI: https://doi.org/10.1007/s10470-009-9423-6

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