A low-dropout linear voltage regulator, comprising: an operational amplifier (A1), a source follower (M2), a power regulator tube (M4), a common-gate amplifier (M3), a pull-up tube (M5), and a tail current source (M1); a source electrode of the source follower (M2) is connected to a drain electrode of the power regulator tube (M4) and a reversed phase input end of the operational amplifier (A1), while a drain electrode of the source follower (M2) is grounded by means of the tail current source (M1), and a gate electrode of the source follower (M2) is connected to an output end of the operational amplifier (A1); a drain electrode of the common-gate amplifier (M3) is connected to a drain electrode of the pull-up tube (M5) and a gate electrode of the power regulator tube (M4), while a source electrode of the common-gate amplifier (M3) is grounded by means of the tail current source (M1); a source electrode of the power regulator tube (M4) and a source electrode of the pull-up tube (M5) are both connected to a voltage source; a positive phase input end of the operational amplifier (A1) is used for inputting a reference voltage, and the source electrode of the source follower (M2) is used for outputting a regulating voltage. By using the low-dropout linear voltage regulator, a high-accuracy output voltage may be obtained, and the output voltage has a high degree of freedom.
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