A low noise and low temperature coefficient bandgap voltage reference
Han Wang · 2024
A segmented temperature compensation bandgap reference with low output noise was designed based on the MGN 0.18um process in this paper. The circuit is powered by a 3.3V power supply, with a reference output voltage of 1.177V. In the temperature range of -45~125 °C and under the TT process angle, simulation results show that the temperature drift coefficient of the traditional structure can only reach 9.8 ppm/°C, and it is 1.08 ppm/°C for the bandgap reference using a new segmented temperature compensation. Compared with the traditional structure, the temperature coefficient is improved by nearly 10 times for the proposed reference generator. And also the amplifier used in this bandgap has chopping modulation, effectively reducing the impact of input offset voltage of the amplifier and 1/f noise of the bandgap. Simulation shows that at 100mHz, the bandgap equivalent output noise without the use of a chopping amplifier is 377uV/Hz, while the bandgap equivalent output noise with the use of a chopping amplifier is 29uV/Hz, with a noise reduction rate of up to 90%.