To meet the requirements of high-speed interface circuits for high precision, low ripple, and high stability, a low-dropout linear regulator (LDO) with low offset and high precision based on CMOS 22nm technology is proposed. This design employs a PMOS power transistor to achieve superior transient response and noise performance. A self-biasing structure is adopted to isolates the operational amplifier from the load, reducing load interference and increasing the open-loop gain. Stability is enhanced by introducing a compensation capacitor at the tail current source, while a shunt technique is utilized to suppress output ripple. Simulation results show that with a load current of 40mA, the output accuracy has a single sigma deviation of only 0.3%. When no external capacitor is used, the shunt module can reduce ripple by 30%, meeting the requirements of high precision and low offset.
Li et al. (2026) studied this question.