A thermal-diffusivity-based frequency reference in standard CMOS with an absolute inaccuracy of ±0.1% from −55°C to 125°C

An on-chip frequency reference exploiting the well-defined thermal diffusivity of IC-grade silicon has been realized in a standard 0.7 ¿m CMOS process. It has an output frequency of 1.6 MHz, and achieves an absolute inaccuracy (device-to-device spread) of ±0.1% from -55°C to 125°C, and a temperature coefficient of ±11.2 ppm/°C, while dissipating 7.8 mW from a 5 V supply.