Low-dropout regulator with high-power-supply-rejection-ratio characteristic

The invention belongs to the technical field of electronic circuits, and particularly relates to a low-dropout regulator with the high-power-supply-rejection-ratio characteristic. Compared with an existing similar LDO, the low-dropout regulator is characterized in that the scheme that a voltage follower is additionally arranged at a power tube grid end is adopted, a low-frequency pole at the power tube grid end in a traditional LDO structure is separated into two high-frequency poles, feed-forward and feedback bandwidths are expanded, a dynamically-biased super source follower serves as output of the voltage follower, equivalent resistance at the power tube grid end under heavy loads is greatly reduced, and the inhibition performance of the low-dropout regulator to high-frequency power source noise interference is improved. A circuit structure of the low-dropout regulator maintains the high LDO efficiency, low noise and the simple circuit structure, and the power supply rejection ratio under the high-frequency condition is increased.