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PSRR calculation question

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guamak_menanak

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psrr calculation

Hi...

If my PSRR is 20(not in dB) and I have 50mV noise on power supply, what will be the offset of my opamp? Is it 20*50mV?

Thanks:)
 

i)this is not really offset(frequency zero, dc component), because the noise is over a wide range of frequencies.
ii) If the PSRR measure was given in (V/V), the output signal will be effectively 20(V/V)*50mV...
iii) A remark about it would be : the PSRR will be measure at unitary gain...beacuse it will be the worst case.
and what frequency was given the PSRR??[/code]
 

It will be 50mV/20 at the output at that frequency where PSRR is 20. Calculate the input offset by dividing this by the closed-loop gain
 

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