A -89dB PSRR 1.064ppm/°C bandgap voltage reference based on curvature compensation

Abstract

In the 0.35 um BCD process, a low-temperature coefficient, high PSRR bandgap voltage reference with high-order curvature compensation is designed. The circuit is simulated and verified using Cadence software. The results indicate that, operating with a power supply voltage of 3.3 V, and functioning across temperatures ranging from -55°C to +125°C, the temperature coefficient of the output reference voltage is 1.064 ppm/°C, the output bandgap reference voltage is 1.227 V, and the power supply rejection ratio of the circuit at a low frequency of 100 Hz is -89 dB. This illustrates that the circuit achieves a favorable balance in temperature coefficient and PSRR, demonstrating its practical utility.