A 1.2-MHz 5.8- Temperature-Compensated Relaxation Oscillator in 130-nm CMOS

This brief presents a low-power temperature-compensated relaxation oscillator in 130-nm CMOS for cubic millimeter wireless sensor node applications. An RC network is proposed for the oscillator, which introduces a zero in the transfer function, creating an additional degree of freedom in the step response used for frequency-temperature compensation. This approach uses conventional CMOS resistor and capacitor options and is fully integrated. The oscillator has a measured nominal frequency of 1.24 MHz with 1.0% variation from -20 °C to 60 °C. It occupies an area of 0.02 mm² and consumes 5.8 μW of active power with a leakage power of 440 pW.