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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.
VLSI Circuits (VLSIC), 2011 Symposium on
Date of Conference: 15-17 June 2011