High power supply rejection ratio LDO circuit capable of being applied to medium-high frequency

The invention relates to a high-power-supply-rejection-ratio LDO circuit capable of being applied to medium-high frequency. The input end of a current source and the input end of a regulating tube MP are connected with a power supply, and the output end of the current source is connected with the power input end of a buffer circuit and the power input end of a reference circuit; the output end of the reference circuit is connected with the positive-phase input end of the buffer circuit, the inverted-phase input end of the buffer circuit is connected with the output end of the buffer circuit, the output end of the buffer circuit is connected with the positive end of the capacitor Ch and the inverted-phase input end of the error amplifier, and the negative end of the capacitor Ch is connected with the grounding end; the output end of the error amplifier is connected with the input end of the adjusting tube MP and the input end of the output current sampling circuit, the output end of the output current sampling