This  Analog Applications Journal talks about Noise in an LDO, the type of noise, and power supply ripple rejection (PSRR). The issues about noise in analog circuits is explained in detail in this note. The description LDO application is also described in this note. This analog applications journal also talks about the simplified block diagram, the closed-loop gain of an LDO and equivalent series resistance (ESR). The note presents the explaination of primary noise sources in an LDO, thermal noise, and noise reduction in LDO application.

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