A High-Order Curvature Compensated CMOS Bandgap Reference Without Resistors

This paper presents a resistor-less high-order curvature compensation bandgap voltage reference. A high-order curvature compensation is based on generating successive V GS voltages with different temperature characteristics, which are used to cancel thermal nonlinearity the first- and higher-order terms of the transistor voltage V EB . At the same time, a piecewise-linear curvature compensation circuit is used to broaden the temperature range of the whole circuit and achieve low-temperature coefficient. The proposed bandgap reference was designed using standard CSMC 0.18-μm CMOS technology. Simulation results indicate that the proposed bandgap reference achieves the best temperature coefficient of 2.37 ppm/°C from − 40 to 125 °C with a supply voltage of 5 V. The BGR output is about 1.1881 V and a − 60.7-dB PSRR at 10 kHz while only consuming 200 μW.