A 14.32 ppm/°C 48 MHz ring relaxation oscillator with high-precision temperature compensation

A 48 MHz 14.32 ppm/°C ring relaxation oscillator (RRO) is presented in 55 nm CMOS. The proposed oscillator employs a High-Precision temperature compensation (HPTC) circuit with a tunable capacitor following different frequencies to minimize its sensitivity to temperature variations. For a temperature range from −20°C to 140°C, the fabricated circuit demonstrates a frequency variation less than ±0.10%, leading to an average frequency drift of 14.32 ppm/°C.