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A low-noise small-area operational amplifier using split active-feedback compensation technique

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Abstract

A low-noise small-area three-stage operational amplifier is presented for arrayed sensor interface systems. The designed amplifier employs a novel small-area phase compensation scheme that allows a relatively high transconductance in the first stage, resulting in relatively low input-referred noise. The proposed amplifier implemented in a standard 180-nm CMOS process occupies an active area of only 0.015 \(\mathrm{mm}^2\). The measurement results show that the amplifier achieves a 6.2-MHz gain-bandwidth product, an input-referred noise of 27 nV/\(\surd \)Hz, and a phase margin of 60°. The current dissipation is 177 \(\upmu \)A at a power supply of 1.5 V.

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Acknowledgements

This work was supported in part by JSPS Grant-in-Aid for Scientific Research (15H05525 and 25820141). We would like to express our thanks to Rohm Corp., Toppan Printing Corp., and Cadence Design Systems Inc. and Mentor Graphics Inc. through the VLSI Design and Education Center (VDEC), the University of Tokyo, for chip fabrication and EDA tools.

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Authors and Affiliations

  1. Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, 441-8580, Japan

    Ippei Akita, Hicham Haibi & Makoto Ishida

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  1. Ippei Akita
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  2. Hicham Haibi
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  3. Makoto Ishida
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Correspondence to Ippei Akita.

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Akita, I., Haibi, H. & Ishida, M. A low-noise small-area operational amplifier using split active-feedback compensation technique. Analog Integr Circ Sig Process 96, 555–564 (2018). https://doi.org/10.1007/s10470-018-1184-7

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  • DOI: https://doi.org/10.1007/s10470-018-1184-7

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