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  • In electronics, power supply rejection ratio or PSRR is a term widely used in the electronic amplifier or voltage regulator datasheets; used to describe the amount of noise from a power supply that a particular device can reject. The PSRR is defined as the ratio of the change in supply voltage in the op-amp to the equivalent output voltage it produces, often expressed in decibels. An ideal op-amp would have infinite PSRR. The output voltage will depend on the feedback circuit, as is the case of regular input offset voltages. But testing is not confined to DC; often an operational amplifier will also have its PSRR given at various frequencies. Unwanted oscillation, including motorboating, can occur when an amplifying stage is too sensitive to signals fed via the power supply from a later power amplifier stage. For example: an amplifier with a PSRR of 100 dB in a circuit to give 40 dB closed-loop gain would allow about 1 millivolt of power supply ripple to be superimposed on the output for every 1 volt of ripple in the supply. This is because