一种低压低温漂高PSRR带隙基准设计OA

A low-voltage,low-temperature-drift,and high-PSRR bandgap reference was presented to meet the demand for reference voltage sources with low supply voltage,high temperature stability,and strong anti-interference capability against supply fluctuations.An improved current-mode bandgap architecture was adopted to generate a stable 600 mV reference voltage,and a high-order temperature compensation technique was introduced to suppress temperature drift.To further enhance the power supply rejection performance,a two-stage folded-cascode error amplifier with differential input and single-ended output was designed.The proposed circuit was implemented in the SMIC 0.18 μm CMOS process and verified via Cadence Spectre simulations.The simulated results showed that the circuit provided a stable 600 mV reference voltage with the supply voltage ranging from 1.2 V to 3.4 V.At a 1.8 V supply voltage,the temperature coefficient was 1.74×10-6/℃ over the temperature range of-45℃ to 150℃,the line regulation was lower than 0.099％/V,the PSRR reached-81.37 dB at 1 kHz,and the total power consumption was 720 μW.The proposed bandgap reference exhibits excellent low-voltage operating capability,superior temperature stability,and high immunity to power supply disturbances.