An all-subthreshold, 0.75V supply, 2ppm/°C, CMOS Voltage Reference

An all-subthreshold CMOS Voltage Reference architecture is presented, which achieves 3^rd order curvature compensation over a wide temperature range. The simulated performance of the proposed architecture with a supply voltage of 0.75V is 2 ppm/°C, over a temperature range of 190 °C (-45 °C to 145 °C). The high order curvature compensation is performed using the non-linearities of an NMOS device, operated in subthreshold, combined with the non-linearities of low-temperature-coefficient poly resistors and high-resistivity poly resistors. The topology achieves a power consumption of 2μW. The design does not require any external components.