Title :
A 80kS/s 36µW resistor-based temperature sensor using BGR-free SAR ADC with a unevenly-weighted resistor string in 0.18µm CMOS
Author :
Wu, Chun-Kuan ; Chan, Wei-Shan ; Lin, Tsung-Hsien
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
A resistor-based temperature sensor with a BGR-free SAR ADC is reported. The non-zero temperature dependency of the ADC reference voltages, as a result of without using a BGR, is compensated by adopting the proposed unevenly-weighted 9-bit resistor string for reference voltage generation. Fabricated in a 0.18 μm CMOS, the sensor achieves 0.25°C resolution over 0~100°C range and draws 20 μA from a 1.8 V supply. At a conversion rate of 80 kS/s, the FOM is 0.11 nJ/°C.
Keywords :
CMOS integrated circuits; analogue-digital conversion; reference circuits; temperature sensors; ADC reference voltages; BGR-free SAR ADC; CMOS; current 20 muA; nonzero temperature dependency; power 36 muW; reference voltage generation; resistor-based temperature sensor; size 0.18 mum; unevenly-weighted resistor string; voltage 1.8 V; CMOS integrated circuits; Calibration; Resistors; Semiconductor device measurement; Temperature measurement; Temperature sensors; Voltage measurement;
Conference_Titel :
VLSI Circuits (VLSIC), 2011 Symposium on
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-61284-175-5
