A high-order temperature-compensated CMOS bandgap voltage reference

A high-order temperature-compensated bandgap voltage reference (BGR) is proposed in SMIC 0.18μm CMOS process in this paper. By adding piecewise temperature compensation circuit and ΔV
_GS
compensation circuit to the conventional BGR, the temperature performance of the proposed BGR is effectively improved. Simulation results show that the temperature coefficient of the proposed BGR is 0.6457ppm/°C when temperature is in the range from -55°C to 125°C. The proposed BGR achieves the power supply rejection ratio (PSRR) of -62.51dB, -62.42dB, -57.67dB, -39.47dB and -19.39dB at 10Hz, 100Hz, 1 kHz, 10 kHz and 100 kHz respectively.