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

This paper proposes an all-digital temperature sensor (ADTS) with a ring oscillator for achieving the following goals: high accuracy; high resolution; low power-supply sensitivity; and low cost. The sensor was developed using a 0.18-μm standard CMOS process with a 1.8-V supply voltage. The measured results indicate that the proposed ADTS generates a Pearson correlation coefficient (R2) 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 is2, and the sensor area is only 0.0004 mm2.