Title :
A CMOS wide-range temperature sensor with process compensation and second-order calibration for Battery Management Systems
Author :
Chua-Chin Wang ; Wen-Je Lu ; Tzu-Chao Wu ; Chun-Ying Juan
Author_Institution :
Dept. of Electr. Eng., Nat. Sun Yat-Sen Univ., Kaohsiung, Taiwan
Abstract :
This paper presents a temperature sensor with process compensation and second-order calibration for Battery Management Systems (BMS). Particularly, the second-order calibrated CTAT and PTAT sensors utilizing a current mirror and an n-well resistor are used to eliminate the second-order term of the temperature coefficient such that the relationship between the output voltage and the temperature is linearized. The proposed temperature sensor is implemented using a typical 0.18 μm CMOS process. The core area and power of the proposed temperature sensor are 0.177 mm2 and 2.0 mW, respectively. In the range from -40°C to 125°C, the worst deviation of the temperature sensor is -1.49°C ~ +2.13°C at FF, TT, and SS corners, respectively. The maximum non-linearity reduction of second-order calibrated CTAT and PTAT sensors are 72.5% and 90.5%, respectively.
Keywords :
CMOS integrated circuits; battery management systems; calibration; compensation; temperature sensors; BMS; CMOS process; battery management systems; calibrated PTAT sensors; current mirror; n-well resistor; power 2.0 mW; process compensation; second-order calibrated CTAT sensors; second-order calibration; size 0.18 mum; temperature -40 C to 125 C; temperature coefficient; temperature sensor; Calibration; Resistance; Resistors; Temperature distribution; Temperature sensors; CTAT sensor; PTAT sensor; process compensation; second-order effects; temperature sensor;
Conference_Titel :
Circuits and Systems (ISCAS), 2014 IEEE International Symposium on
Conference_Location :
Melbourne VIC
Print_ISBN :
978-1-4799-3431-7
DOI :
10.1109/ISCAS.2014.6865203
