Measuring Power Supply Rejection Ratio (PSRR)

Example of the use of an oscilloscope to measure Power Supply Rejection Ratio, in this case for a linear voltage regulator.

Power Supply Rejection Ratio or Power Supply Ripple Rejection (PSRR) is a measure of a circuit’s power supply’s rejection expressed as a log ratio of output noise to input noise.

Source:

• Arbitrary/Function Generator (built into 6 Series MSO)
• Bench power supply
• Picotest J2120A Line Injector

Measure:

• 6 Series MSO Oscilloscope

Load:

• DC Load on the output of the DUT

Videos recorded by:
Tony Ambrose, Application Engineer, Tektronix
Steve Sandler, Founder, and CEO of PICOTEST.com