0.7 V supply, 8 nW, 8 ppm/°C resistorless sub-bandgap voltage reference

In this work a new resistorless sub-bandgap voltage reference topology is presented. It is a self-biased and small area circuit that works in the nano-ampere consumption range, and under 1 V of power supply. The behavior of the circuit is analitically described, a design methodology is proposed and simulation results are presented for a standard 0.18 μm CMOS proCess. A reference voltage of 463 mV is demonstrated, with a temperature coefficient of 8 ppm/°C for the 0 to 125 °C range, while the power consumption of the whole circuit is 8.25 nW under a 0.75 V power supply at 27 °C. The estimated silicon area is 0.0043 mm².