A 0.6V 1.76nW power on reset circuit with high accuracy

Abstract

A low voltage high-accuracy power on reset circuit with an ultra-low quiescent current is proposed in this paper. The circuit employs a 5-transistor voltage reference with a good temperature stability instead of bandgap to provide a precise reference voltage, which is compared with the supply voltage to generate an accurate trip voltage. A 4-transistor complementary-to-absolute-temperature voltage reference is proposed for temperature compensation and reduces significantly the trip voltage deviation. The proposed circuit is implemented in 55-nm CMOS process with an area of 2080µm². The measurement results show that the trip-voltage deviation is only 5mV from -40°C to 125°C. And it achieves a power consumption of 1.76nW at 0.6V.