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A 0.9 V 3rd-order single-opamp analog filter in 28 nm bulk-CMOS

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Abstract

This paper presents a 28 nm-bulk-CMOS 3rd-order 132 MHz low-pass filter based on an improved Active-gm-RC stage. Challenges related to the design of analog circuits in 28 nm-bulk-CMOS process node are faced, mitigated and exploited by operating at both architecture and circuit design levels. The filter uses a single-opamp two-stage topology where both poles are used for synthesizing a 3rd-order low-pass transfer function. The proposed filter operates from a single 0.9 V supply voltage, consumes 340 µW and performs high linearity (IIP3 = 11.5 dBm at 21 and 22 MHz input tones) and large Signal-to-Noise ratio (58 dB). This enables one of the higher Figure-of-Merit (163.2 dB) with respect to the state-of-the-art.

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Notes

  1. Moreover, some passive components (usually the capacitors) are implemented with a programmable array in order to align the filter transfer function to the target frequency response, even in presence of passive component value deviation due to Process, Voltage, or Temperature (PVT) variations. In this way, a tuning circuit is used to control the effectively connected components, and, as a consequence, the filter frequency response.

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Acknowledgements

This activity is within the ScalTech28 project funded by INFN (Italian National Institute for Nuclear Physics).

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Authors and Affiliations

  1. Department of Innovation Engineering, University of Salento, Lecce, Italy

    Stefano D’Amico & Andrea Donno

  2. Department of Physics, University of Milan-Bicocca, Milan, Italy

    Marcello De Matteis & Andrea Baschirotto

  3. Istituto Italiano di Fisica Nucleare, Milan, Italy

    Marcello De Matteis & Andrea Baschirotto

  4. Thetis Microelectronics srls, Lecce, Italy

    Andrea Donno

Authors
  1. Stefano D’Amico
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  2. Marcello De Matteis
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  3. Andrea Donno
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  4. Andrea Baschirotto
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Correspondence to Stefano D’Amico.

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D’Amico, S., De Matteis, M., Donno, A. et al. A 0.9 V 3rd-order single-opamp analog filter in 28 nm bulk-CMOS. Analog Integr Circ Sig Process 98, 155–167 (2019). https://doi.org/10.1007/s10470-018-1261-y

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  • DOI: https://doi.org/10.1007/s10470-018-1261-y

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