A 1V Supply, 81nW, 800mv Bandgap Reference Voltage Circuit for Low Power Devices

An ultra-low power bandgap reference voltage circuit using an 180nm CMOS process is presented. To operate with a low input voltage, the CTAT voltage divider and PTAT voltage multiplier are applied together in this design. The proposed reference can generate a 0.8V reference voltage with a minimum supply voltage of 0.8V. According to the post-layout simulation, the power consumption of the bandgap reference is 65nW with an external clock and 81nW without external clock. The temperature coefficient of the proposed bandgap voltage reference is 56ppm/°C when the ambient temperature ranges from −25°C to 100°C.