A high PSRR bandgap reference with high-order temperature compensation
To reduce the temperature coefficient of the bandgap reference and enhance its PSRR,a high PSRR bandgap reference was designed with high-order temperature compensation.A curvature compensation circuit was proposed based on the temperature coefficient of a BJT.This circuit generates a current with a positive high-order temperature coefficient to compensate for the high-order temperature coefficient of the BJT in the traditional bandgap reference.This allows the bandgap reference to achieve lower temperature drift characteristics.Meanwhile,a built-in voltage source structure was used to improve the PSRR of the bandgap reference by negative feedback.Based on the SMIC 0.18 μm BCD process,the designed circuit was made.Simulation results show that the designed bandgap reference has a temperature coefficient of only 0.43 × 10-6/℃ from-40 to 125 ℃,and the PSRR is-95.1 dB at low frequency.
万方数据
维普
