A CMOS thermistor-embedded continuous-time delta-sigma temperature sensor with a resolution of 0.01 °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 2^nd-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 to facilitate the 1-point temperature calibration. The proposed TS is fabricated in a 0.18-μm CMOS process. Over a range of -45 °C ~ 125 °C, this TS achieves 0.01 °C rms temperature resolution with a single conversion time of 100 μs.