A 13.8-MHz RC oscillator with self-calibration for ±0.4% temperature stability from −55 to 125°C

This paper articulates a novel oscillator design that can provide stable frequency operation over a wide temperature range using self-calibration technique. A simple ring oscillator is implemented to sense its temperature variation, and digital circuits to tune the output frequency according to the sensing outcomes has also been incorporated to the design. Simulation results show that the circuit can generate a stable frequency of 13.8 MHz. The power consumption of the whole system is only 52.8μW. The temperature coefficient is less than ±0.4% across -55 to 125°C in the worst process corner, operating at an ultra-low supply voltage of 0.6 V.