ABSTRACT This document describes how power-supply ripple and noise components affect a PurePath Digital audio amplifier. The document identifies a way to measure power-supply rejection ratio (PSRR). The document also shows PSRR measurement for the TAS5086-5142V6EVM. The result can also be related to the output stages TAS5111, TAS5112, TAS5122, TAS5142, TAS5152, and TAS5182 when using the modulators TAS5028, TAS5066, TAS5076, TAS5086, TAS5508, and TAS5518.