High power supply rejection ratio (PSRR) and low dropout regulator

摘要

A low dropout voltage regulator (LDO) includes first and second amplifiers and a current mirror. The first amplifier includes a first input receiving a reference voltage and a second input receiving a voltage proportional to an output of the LDO. The current mirror includes an input current at a first end of the current mirror to an output current at a second end of the current mirror, the input current controlled by an output of the first amplifier and the output current being supplied to the output of the LDO. The second amplifier includes a first input coupled to the first end of the current mirror and a second input coupled to the second end of the current mirror.

主权项

1. A low dropout voltage regulator (LDO), comprising:
a first amplifier including a first input for receiving a reference voltage and a second input for receiving a voltage proportional to an output of the LDO; a current mirror that mirrors an input current at a first end of the current mirror to an output current at a second end of the current mirror, the input current of the current mirror being controlled by an output of the first amplifier and the output current of the current mirror being supplied to the output of the LDO; an amplifying element coupled to the current mirror; and a current source coupled to the amplifying element and configured to provide a bias current to the amplifying element.