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 Δ=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/ ℃ in a temperature range from -55~125 ℃.