Ripple Rejection Ratio or Power Supply Rejection Ratio (PSRR) is a measure of
how well a circuit, component or Power Supply rejects ripple coming from it's input
at various frequencies and is very critical in
many RF and wireless applications. In the case of an LDO(Low Drop Out Regulator),
it is a measure of the output ripple compared to the input
ripple over a wide frequency range (10 Hz to 10 MHz is
common) and is expressed in decibels (dB).
Read more by checking out this PDF file. Or click on the photo below.
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