IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
LETTER
An ultra-low power robust CMOS temperature sensor with an inaccuracy of ±0.7°C from −40°C to 85°C
Yi HuJiali HouJianyun ZhangDavid Wei ZhangYang He
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2019 Volume 16 Issue 16 Pages 20190381

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Abstract

An ultra-low power robust CMOS temperature sensor is presented for RFID. The BJT-based sensor employs a calibrated hybrid ADC, which combines a coarse 5-bit SAR conversion with a fine 9-bit delta-sigma conversion. For the purpose of being robust, an error correction method is proposed in this paper, which can calibrate the SAR errors caused by power supply and mismatch. A smart clock generator is also proposed to adapt the change of PTAT bias current, which provides the integrators more settling time in low temperature with low bias current and makes the delta-sigma ADC faster in high temperature to reduce the error caused by leakage. The sensor has been implemented in a 130 nm CMOS process. After a one-point temperature trimming, the sensor has a resolution of 0.015 from −40°C to 85°C, and only consumes 10 µA from 1.5 V supply.

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© 2019 by The Institute of Electronics, Information and Communication Engineers
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