A novel wide temperature range bandgap reference

This paper reports a high performance bandgap voltage reference, in which the temperature is distinguished by a simple on chip thermometer. Four similar performance bandgap references operate in different temperature ranges with high preference. Each bandgap reference works with the discussion on the principle of the quadratic temperature compensation. Two resistors made of different materials are used to compensate the quadratic temperature, and hence to efficiently reduce the temperature drift of the bandgap voltage reference. To decrease the offset voltage, the improved design methods for circuit and layout are introduced. The cascode structure is also introduced in this bandgap voltage reference circuit to improve the power supply rejection ratio (PSRR). Finally the simulation results based on 0.35 μm CMOS process indicate that the temperature coefficient of the proposed reference is 300 ppm during the full temperature range (-65°C~150°C).