Noise on op-amp supply

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vortex3

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When I use an operational amplifier, for example, for an inverting amplifier, how important is to have a low level noise (ripple) on the power supply? In other words, should I expect to have the same ripple of the power supply on the output signal of the op-amp superimpose to the signal?

Thanks!
 

If you read the specs for an opamp you'll see a parameter called PSRR (Power Supply Rejection Ratio). This tells you the effect on the output that deviations on the supply have. The higher the number, the better rejection you'll have.
 
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