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Power supply rejection ratio measurements (PSRR)

Power supply design engineers often face the challenge of measuring the power supply rejection ratio or power supply ripple rejection (PSRR) of their design. The PSRR is an important parameter to indicate the power supply’s output stability. It provides information about the influence of input voltage variations on the stability of the output voltage.

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Key findings you will learn from reading this paper include:

• how important PSRR is to indicate the power supply's output stability
• how a PSRR can be measured by applying a sinusoidal ripple to the supply voltage
• how an oscilloscope and the probes from Rohde & Schwarz can help with the measurement task

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