Journal ArticleDOI
A Fully-Integrated 71 nW CMOS Temperature Sensor for Low Power Wireless Sensor Nodes
TLDR
A new sensing element is introduced that outputs only 75 mV to save both power and area in battery-operated, ultra-low power microsystems and is integrated into a wireless sensor node to demonstrate its operation at a system level.Abstract:
We propose a fully-integrated temperature sensor for battery-operated, ultra-low power microsystems. Sensor operation is based on temperature independent/dependent current sources that are used with oscillators and counters to generate a digital temperature code. A conventional approach to generate these currents is to drop a temperature sensitive voltage across a resistor. Since a large resistance is required to achieve nWs of power consumption with typical voltage levels (100 s of mV to 1 V), we introduce a new sensing element that outputs only 75 mV to save both power and area. The sensor is implemented in 0.18 μm CMOS and occupies 0.09 mm 2
while consuming 71 nW. After 2-point calibration, an inaccuracy of + 1.5°C/-1.4°C is achieved across 0 °C to 100 °C. With a conversion time of 30 ms, 0.3 °C (rms) resolution is achieved. The sensor does not require any external references and consumes 2.2 nJ per conversion. The sensor is integrated into a wireless sensor node to demonstrate its operation at a system level.read more
Citations
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Journal ArticleDOI
RF power harvesting: a review on designing methodologies and applications
TL;DR: This review provides a summ ary of radio frequency (RF) power harvesting technologies in order to serve as a guide for the design of RF energy harvesting units.
Journal ArticleDOI
Ultra-Low Resonant Piezoelectric MEMS Energy Harvester With High Power Density
Hyun Cheol Song,Prashant Kumar,Deepam Maurya,Min Gyu Kang,William T. Reynolds,Dae-Yong Jeong,Chong Yun Kang,Shashank Priya +7 more
TL;DR: In this paper, a spiral shaped microelectromechanical system (MEMS) energy harvester was designed to harvest ambient vibrations at a low frequency exhibiting remanent polarization of 36.2
Journal ArticleDOI
Review—Power Sources for the Internet of Things
Abhi Raj,Daniel A. Steingart +1 more
Journal ArticleDOI
A VCO Based Highly Digital Temperature Sensor With 0.034 °C/mV Supply Sensitivity
TL;DR: A self-referenced VCO-based temperature sensor with reduced supply sensitivity and a novel sensing technique in which temperature information is acquired by evaluating the ratio of the output frequencies of two ring oscillators, designed to have different temperature sensitivities, thus avoiding the need for an external frequency reference.
Proceedings ArticleDOI
9.2 A 0.6nJ −0.22/+0.19°C inaccuracy temperature sensor using exponential subthreshold oscillation dependence
Kaiyuan Yang,Qing Dong,Wanyeong Jung,Yiqun Zhang,Myungjoon Choi,David Blaauw,Dennis Sylvester +6 more
TL;DR: This work proposes to build a temperature sensor that uses a system's core RTC as a timing reference to minimize power/area overhead and shows a fully integrated sensor that includes an RC-based timing circuit for systems that might not have a timing source.
References
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Book
CMOS VLSI Design : A Circuits and Systems Perspective
Neil Weste,David Money Harris +1 more
TL;DR: The authors draw upon extensive industry and classroom experience to introduce todays most advanced and effective chip design practices, and present extensively updated coverage of every key element of VLSI design, and illuminate the latest design challenges with 65 nm process examples.
Book
Design of High-Performance Microprocessor Circuits
TL;DR: The design of next generation microprocessors in deep submicron CMOS technologies is covered, and a broad range of circuit styles and VLSI design techniques are covered, an indispensable reference for practicing circuit designers, architects, system designers, CAD tool developers, process technologists, and researchers.
Journal ArticleDOI
A CMOS smart temperature sensor with a 3/spl sigma/ inaccuracy of /spl plusmn/0.1/spl deg/C from -55/spl deg/C to 125/spl deg/C
TL;DR: In this paper, a low-cost temperature sensor with on-chip sigma-delta ADC and digital bus interface was realized in a 0.5 /spl mu/m CMOS process.
Journal ArticleDOI
A Portable 2-Transistor Picowatt Temperature-Compensated Voltage Reference Operating at 0.5 V
TL;DR: The proposed voltage reference for use in ultra-low power systems, referred to as the 2T voltage reference, which has been demonstrated in silicon across three CMOS technologies, is proposed, showing the design exhibits comparable spreads in TC and output voltage to existing voltage references in the literature.
Journal ArticleDOI
Circuits for a Cubic-Millimeter Energy-Autonomous Wireless Intraocular Pressure Monitor
Mohammad Hassan Ghaed,Gregory K. Chen,Razi-ul Haque,Michael Wieckowski,Yejoong Kim,Gyouho Kim,Yoonmyung Lee,Inhee Lee,David Fick,Daeyeon Kim,Mingoo Seok,Kensall D. Wise,David Blaauw,Dennis Sylvester +13 more
TL;DR: Continuous measurement can be achieved with an implanted monitor to improve treatment regiments, assess patient compliance to medication schedules, and prevent unnecessary vision loss.