Principle and Realization of a High-order Curvature-Compensated Bandgap Voltage Veference

A high-order curvature-compensated bandgap reference, which based on an exponential curvature compensation and second-order curvature compensation technique, is presented in this paper.In this work, current mirror and negative feedback loop instead of op-amp feedback loop, this approach not only eliminate the output voltage error and temperature drift which is caused by input offset voltage, but also make the circuit is much simple and more conducive to integration;Using second order curvature compensation and the characteristics of the temperature dependency of β is an exponential function of temperature, achieving the good output temperature characteristics.The circuit and layout is implemented in 0.6μm BiCMOS process, and the simulation results show that: Under the condition of ΔV=2.7 V wide input voltage range, it possesses the power supply rejected characteristic of 0.08 mV/V;temperature coefficient of the voltage reference is 5×10^-6/ ℃ in a temperature range from -55~125 ℃.