A 10.6 pJ·K2 Resolution FoM Temperature Sensor Using Astable Multivibrator

Bo Wang; Man Kay Law; Chi Ying Tsui; Amine Bermak

doi:10.1109/TCSII.2017.2739707

A 10.6 pJ·K² Resolution FoM Temperature Sensor Using Astable Multivibrator

Bo Wang^*, Man Kay Law, Chi Ying Tsui, Amine Bermak

^*Corresponding author for this work

CSE Information & Computing Technology

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

This brief presents a 0.9-μW duty-cycle-modulated temperature sensor with a sub-μA peak current for energy harvester- or micro-battery-powered systems. A compact sensing frontend is proposed to achieve low power, together with various device-level leakage and nonlinearity compensation techniques adopted to minimize the sensor error. In addition, a current-starved multivibrator which provides inherent clamping voltages is used for duty cycle modulation for overall energy savings. The sensor designed in 0.18-μm CMOS process achieves a resolution figure of merit of 10.6 pJ.K², which is among the most energy-efficient designs to date. Trimmed at 30 °C, the sensor achieves ±0.85 °C precision from -30 °C to 120 °C. The maximum supply sensitivity is 0.7 °C/V for a 1.6-2 V supply.

Original language	English
Pages (from-to)	869-873
Number of pages	5
Journal	IEEE Transactions on Circuits and Systems II: Express Briefs
Volume	65
Issue number	7
DOIs	https://doi.org/10.1109/TCSII.2017.2739707
Publication status	Published - Jul 2018

Keywords

CMOS temperature sensor
bipolar
emitter-coupled astable multivibrator
peak current
self-regulated BGR

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10.1109/TCSII.2017.2739707

Cite this

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title = "A 10.6 pJ·K2 Resolution FoM Temperature Sensor Using Astable Multivibrator",

abstract = "This brief presents a 0.9-μW duty-cycle-modulated temperature sensor with a sub-μA peak current for energy harvester- or micro-battery-powered systems. A compact sensing frontend is proposed to achieve low power, together with various device-level leakage and nonlinearity compensation techniques adopted to minimize the sensor error. In addition, a current-starved multivibrator which provides inherent clamping voltages is used for duty cycle modulation for overall energy savings. The sensor designed in 0.18-μm CMOS process achieves a resolution figure of merit of 10.6 pJ.K2, which is among the most energy-efficient designs to date. Trimmed at 30 °C, the sensor achieves ±0.85 °C precision from -30 °C to 120 °C. The maximum supply sensitivity is 0.7 °C/V for a 1.6-2 V supply.",

keywords = "CMOS temperature sensor, bipolar, emitter-coupled astable multivibrator, peak current, self-regulated BGR",

author = "Bo Wang and Law, \{Man Kay\} and Tsui, \{Chi Ying\} and Amine Bermak",

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AU - Wang, Bo

AU - Law, Man Kay

AU - Tsui, Chi Ying

AU - Bermak, Amine

PY - 2018/7

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AB - This brief presents a 0.9-μW duty-cycle-modulated temperature sensor with a sub-μA peak current for energy harvester- or micro-battery-powered systems. A compact sensing frontend is proposed to achieve low power, together with various device-level leakage and nonlinearity compensation techniques adopted to minimize the sensor error. In addition, a current-starved multivibrator which provides inherent clamping voltages is used for duty cycle modulation for overall energy savings. The sensor designed in 0.18-μm CMOS process achieves a resolution figure of merit of 10.6 pJ.K2, which is among the most energy-efficient designs to date. Trimmed at 30 °C, the sensor achieves ±0.85 °C precision from -30 °C to 120 °C. The maximum supply sensitivity is 0.7 °C/V for a 1.6-2 V supply.

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KW - bipolar

KW - emitter-coupled astable multivibrator

KW - peak current

KW - self-regulated BGR

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A 10.6 pJ·K² Resolution FoM Temperature Sensor Using Astable Multivibrator

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Keywords

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