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http://dx.doi.org/10.6109/jkiice.2016.20.9.1747

A High Accuracy and Fast Hybrid On-Chip Temperature Sensor  

Kim, Tae-Woo (School of Electrical Engineering and Computer Science, Graduate School of Chungbuk National University)
Yun, Jin-Guk (Silliconworks)
Woo, Ki-Chan (School of Electrical Engineering and Computer Science, Graduate School of Chungbuk National University)
Hwang, Seon-Kwang (School of Electrical Engineering and Computer Science, Graduate School of Chungbuk National University)
Yang, Byung-Do (Department of Electronics Engineering, Chungbuk National University)
Abstract
This paper presents a high accuracy and fast hybrid on-chip temperature sensor. The proposed temperature sensor combines a SAR type temperature sensor with a ${\Sigma}{\Delta}$ type temperature sensor. The SAR type temperature sensor has fast temperature searching time but it has more error than the ${\Sigma}{\Delta}$ type temperature sensor. The ${\Sigma}{\Delta}$ type temperature sensor is accurate but it is slower than the SAR type temperature sensor. The proposed temperature sensor uses both the SAR and ${\Sigma}{\Delta}$ type temperature sensors, so that the proposed temperature sensor has high accuracy and fast temperature searching. Also, the proposed temperature sensor includes a temperature error compensating circuit by storing the temperature errors in a memory circuit after chip fabrication. The proposed temperature sensor was fabricated in 3.3V CMOS $0.35{\mu}m$ process. Its temperature resolution, power consumption, and area are $0.15^{\circ}C$, $540{\mu}W$, and $1.2mm^2$, respectively.
Keywords
Temperature sensor; Hybrid; SAR; ${\Sigma}{\Delta}$;
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