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Energy-Efficient Smart Temperature Sensors in CMOS Technology

  • Kamran Souri
  • Kofi A.A. Makinwa

Part of the Analog Circuits and Signal Processing book series (ACSP)

Table of contents

  1. Front Matter
    Pages i-xvi
  2. Kamran Souri, Kofi A. A. Makinwa
    Pages 1-18
  3. Kamran Souri, Kofi A. A. Makinwa
    Pages 19-36
  4. Kamran Souri, Kofi A. A. Makinwa
    Pages 37-58
  5. Kamran Souri, Kofi A. A. Makinwa
    Pages 59-89
  6. Kamran Souri, Kofi A. A. Makinwa
    Pages 91-108
  7. Kamran Souri, Kofi A. A. Makinwa
    Pages 109-114
  8. Back Matter
    Pages 115-118

About this book

Introduction

This book describes the design and implementation of energy-efficient smart (digital output) temperature sensors in CMOS technology. To accomplish this, a new readout topology, namely the zoom-ADC, is presented. It combines a coarse SAR-ADC with a fine Sigma-Delta (SD) ADC. The digital result obtained from the coarse ADC is used to set the reference levels of the SD-ADC, thereby zooming its full-scale range into a small region around the input signal. This technique considerably reduces the SD-ADC’s full-scale range, and notably relaxes the number of clock cycles needed for a given resolution, as well as the DC-gain and swing of the loop-filter. Both conversion time and power-efficiency can be improved, which results in a substantial improvement in energy-efficiency. Two BJT-based sensor prototypes based on 1st-order and 2nd-order zoom-ADCs are presented. They both achieve inaccuracies of less than ±0.2°C over the military temperature range (-55°C to 125°C). A prototype capable of sensing temperatures up to 200°C is also presented. As an alternative to BJTs, sensors based on dynamic threshold MOSTs (DTMOSTs) are also presented. It is shown that DTMOSTs are capable of achieving low inaccuracy (±0.4°C over the military temperature range) as well as sub-1V operation, making them well suited for use in modern CMOS processes.


  • Presents a new readout technique (the zoom-ADC) to address the implementation of energy-efficient temperature sensors in CMOS technology;
  • Shows how this technique can be used to design energy-efficient temperature sensors without compromising other key specifications, such as accuracy and resolution;
  • Shows how this technique can be used to design general-purpose incremental ADCs that can achieve both high resolution and state-of-the-art energy efficiency;
  • Presents DTMOST-based temperature sensors, which achieve significantly higher accuracy than previous all-CMOS temperature sensors.

Keywords

Energy-Efficient Temperature Sensors Incremental Analog to Digital converters energy efficient ADCs sensor interfaces in CMOS technology zoom-ADCs

Authors and affiliations

  • Kamran Souri
    • 1
  • Kofi A.A. Makinwa
    • 2
  1. 1.SiTime Corp.Santa ClaraUSA
  2. 2.Delft University of TechnologyDelftThe Netherlands

Bibliographic information

  • DOI https://doi.org/10.1007/978-3-319-62307-8
  • Copyright Information Springer International Publishing AG 2018
  • Publisher Name Springer, Cham
  • eBook Packages Engineering
  • Print ISBN 978-3-319-62306-1
  • Online ISBN 978-3-319-62307-8
  • Series Print ISSN 1872-082X
  • Series Online ISSN 2197-1854
  • Buy this book on publisher's site