Design of a Bandgap Reference with Low Temperature Drift and High PSRR

Abstract

In this paper, A precision bandgap reference (BGR) with high power supply rejection ratio (PSRR) and low-temperature coefficient (TC) is designed. It comprises a bandgap reference core circuit, a negative feedback loop, a nonlinear temperature compensation circuit, and a bias circuit. The bias circuit is used to increase the PSRR, a negative feedback loop is introduced to maintain the constant output reference voltage, and a nonlinear compensation circuit is used to increase the temperature drift coefficient of the bandgap reference. The voltage supply is 3. 3V. This simulation is based on the SMIC 0.1S$\mu$m CMOS process. The results show that the temperature drift coefficient of the bandgap reference source is 3.255ppm/°C in the temperature range of −40°C~130°C. The PSRR is 103. 192dB at the frequency of 1Hz. The power consumption is 13.1996$\mu$W. The offset voltage is 2.15591mV by Monte Carlo simulation.