771mV, 173nA, 90nm CMOS resistorless trimmable voltage reference

A low power voltage reference generator operating with a supply voltage ranging from 1.6 V to 3.6 V has been implemented in a 90-nm standard CMOS process. The reference is based on MOSFETs biased in the weak inversion region to consume nanowatts of power and uses no resistors. The maximum supply current at 3.6 V and at 125°C is 173 nA. It provides an 771 mV voltage reference. A temperature coefficient of 7.5 ppm/°C is achieved at best and 39.5 ppm/°C on average, in a range from -40 to 125°C, as the combined effect of a suppression of the temperature dependence of mobility and the compensation of the threshold voltage temperature variation. The total block area is 0.03 mm².