A High-Accuracy, High-Resolution, and Low-Cost All-Digital Temperature Sensor Using a Voltage Compensation Ring Oscillator

摘要

This paper proposes an all-digital temperature sensor (ADTS) with a ring oscillator for achieving the following goals: 1) high accuracy; 2) high resolution; 3) low power-supply sensitivity; and 4) low cost. The sensor was developed using a 0.18- standard CMOS process with a 1.8-V supply voltage. The measured results indicate that the proposed ADTS generates a Pearson correlation coefficient () of 0.99998 and an error of −0.851 °C to 0.524 °C. The resolution is 0.0582 °C/LSB, and the power consumption is <1 for every sample in the temperature range between 0 °C and 100 °C. Furthermore, the power-supply sensitivity is <11.67% between the supply voltage variations (±10%), the temperature sensor system occupies an area of , and the sensor area is only 0.0004 .