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What's the simplest method to measure PSRR?

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kudjung

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How one measure the PSRR of his power supply circuit? Need simplest method.
Any info will be help.
 

tlihu

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measure psrr

I'm interested in this topic, too! :p
 

hock

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measuring psrr

PSRR for powersupply?
i do not think so.
you must be refering to close loop mode modeling od SMPS where terms like this might be used.
hock
 

Moss

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psrr measure

The simpliest method is to measure with scope ripple before regulator at the charging capacitor, and to compare it to the ripple at the output. For example if you measure 3Vp-p on the cap after diode bridge, and 30mV at the output PSRR will be
PSRR = 20log dVout/dVin=- 20log(0.03/3)= 40dB
 

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