A Cmos Thermistor- Embedded Continuous-Time Delta-Sigma Temperature Sensor With A Resolution Of 0.01 Degrees C

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 1-bit 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 to facilitate the 1-point temperature calibration. The proposed TS is fabricated in a 0.18-mu m CMOS process. Over a range of -45 degrees C similar to 125 degrees C, this TS achieves 0.01 degrees C rms temperature resolution with a single conversion time of 100 mu s.