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-& mu;m CMOS technology. Simulation results indicate that the proposed bandgap reference achieves the best temperature coefficient of 2.37 ppm/& DEG;C from - 40 to 125 & DEG;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 & mu;W.

Automated summary

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. The proposed bandgap reference achieves the best temperature coefficient of 2.37 ppm/°C with a supply voltage of 5 V.