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In a smart temperature sensor system, two individual building blocks, a sensing front-end and an analog-to-digital converter, are cascaded to implement the temperature-to-digital conversion. In this work, a thermistor-embedded continuous-time delta-sigma modulator (CTDSM), which merges these two building blocks into one, is proposed for a hardware- and energy-efficient temperature acquisition. The...
A thermistor-embedded continuous-time delta-sigma modulator (CTDSM) implementing a temperature sensor (TS) is proposed in this paper. By embedding the resistor-based temperature sensing module into a 2nd-order 1bit CTDSM, the proposed TS achieves high resolution sensing with reduced hardware complexity and power consumption. Furthermore, a resistor-ladder trimming and compensation scheme is proposed...
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 0.18µm CMOS, the sensor achieves 0.25°C resolution over 0∼100°C range and draws 20µA from a 1...
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