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Micropower Incremental Analog-to-Digital Converters

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Efficient Sensor Interfaces, Advanced Amplifiers and Low Power RF Systems

Abstract

Integrated sensor interfaces require energy-efficient high-resolution data converters. In many applications, the best choice is to use incremental analog-to-digital converters (IADCs) incorporating variants of extended counting. In this chapter, we discuss the design of a micropower IADC. By using a feed-forward architecture, the IADC accumulates the residue voltage, so various hybrid variants of extended counting can be implemented. Several such schemes are reviewed and discussed, as well as the trade-off between higher order modulators, higher oversampling ratio and energy efficiency. A two-step IADC is proposed, which extends the performance of an Nth-order IADC close to that of a (2N − 1)th-order IADC. A design example uses the circuitry of a second-order IADC to achieve a performance nearly equal to that of a third-order IADC. The implemented IADC achieves a measured dynamic range of 99.8 dB, and a SNDR of 91 dB for a maximum input 2.2 VPP and a bandwidth of 250 Hz. Fabricated in 65 nm CMOS and operated from a 1.2 V power supply, the IADC’s core area is 0.2 mm2, and it consumes only 10.7 μW. The measured FoMs are 0.76 pJ/conv.step and 173.5 dB, both among the best reported results for IADCs.

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Authors and Affiliations

  1. School of EECS, Oregon State University, Corvallis, OR, 97330, USA

    Chia-Hung Chen, Yi Zhang, Tao He & Gabor C. Temes

Authors
  1. Chia-Hung Chen
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  2. Yi Zhang
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  3. Tao He
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  4. Gabor C. Temes
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Corresponding author

Correspondence to Chia-Hung Chen .

Editor information

Editors and Affiliations

  1. Department of Microelectronics, Delft University of Technology, Delft, The Netherlands

    Kofi A.A. Makinwa

  2. Dept. of Physics “G. Occhialini”, University of Milan, Milano, Italy

    Andrea Baschirotto

  3. Department of Electrical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands

    Pieter Harpe

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Chen, CH., Zhang, Y., He, T., Temes, G.C. (2016). Micropower Incremental Analog-to-Digital Converters. In: Makinwa, K., Baschirotto, A., Harpe, P. (eds) Efficient Sensor Interfaces, Advanced Amplifiers and Low Power RF Systems. Springer, Cham. https://doi.org/10.1007/978-3-319-21185-5_2

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  • DOI: https://doi.org/10.1007/978-3-319-21185-5_2

  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-21184-8

  • Online ISBN: 978-3-319-21185-5

  • eBook Packages: EngineeringEngineering (R0)

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