@inproceedings{bc717d15ba9f4993ae6aa623167c4b6d,
title = "A ring oscillator-based temperature sensor for u-healthcare in 0.13μm CMOS",
abstract = "In this paper, a low-power ring oscillator-based temperature sensor designed for U-healthcare is presented. Unlike conventional temperature sensors relying on power-hungry bandgap references and ADCs, the proposed sensor exploits the frequency of the ring oscillator that increases as temperature increases as a way of converting temperature to a digital output. Power of the sensor is also saved by stacking circuits for charge recycling and carefully balancing top and bottom circuits to make every circuit operate within 0.3-0.5V voltage headroom when 0.8V supply voltage is used. The first order noise shaping is realized by the ring oscillator and the counter structure for higher resolution. Simulation results indicate that the proposed temperature sensor has a resolution of 0.18°C/LSB at 100Hz of conversion rate over a temperature range of 5 to 100°C. The power consumption of the proposed temperature sensor is only 30nW and the area is only 0.05mm2 in a standard 0.13μm CMOS process.",
keywords = "Charge recycling, Noise shaping, Ring oscillator, Temperature sensor",
author = "Woo, \{Sung Sik\} and Lee, \{Jung Hyup\} and Seonghwan Cho",
year = "2009",
doi = "10.1109/SOCDC.2009.5423820",
language = "English",
isbn = "9781424450343",
series = "2009 International SoC Design Conference, ISOCC 2009",
pages = "548--551",
booktitle = "2009 International SoC Design Conference, ISOCC 2009",
note = "2009 International SoC Design Conference, ISOCC 2009 ; Conference date: 22-11-2009 Through 24-11-2009",
}