A Bandgap Voltage Reference with Low Temperature Coefficient and High PSRR Designed for LDO
Yuzi Wang, Xichen Duan, Kai Sun, Peng Huang, Liuyang Zhang, Jie Liang · 2023
This paper proposes a structure for providing a reference voltage for low drop-out (LDO) regulators with extremely low temperature coefficient and high power supply rejection ratio (PSRR). This voltage reference is designed with bandgap technology, a high-order compensation structure is added to the basic bandgap structure to obtain a much lower temperature coefficient. Also the gain of the operational amplifier is increased to obtain a higher PSRR. This paper uses a 0.18 μm process and shows that when the power supply voltage is 3.3 V, the temperature coefficient between -40~180 ℃ is 2.352 ppm/℃, the PSRR at 1 kHz is -112.16 dB.