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LDO noise demystified

Posted: 10 Mar 2010     Print Version  Bookmark and Share

Keywords:LDO noise  low dropout regulator  linear regulator 

Low dropout linear regulators (LDOs) are a simple way to regulate an output voltage that is powered from a higher voltage input. Although it is simple to operate, its self generated noise is most of the times confused with its power supply rejection ratio (PSRR). Many times the two are combined together and loosely called just "noise". This is not correct. Noise is generated by the transistors and resistors in the LDO's internal circuitry and by the external components.

This application report explains the difference between noise and PSRR of an LDO. It also explains the different ways noise is specified in LDO datasheets and which specification should be used in the application. Finally it explains how LDO noise is reduced.

View the PDF document for more information.

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