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Supply voltage to op-amp drops

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mjuneja

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Consider a simple op-amp in negative feedback amplifier circuit as attached in the picture.

What will happen if the one of the supply voltage (either positive or negative) drops due to some problem in the power supply used.

Will it affect the gain or only the saturation level will get reduced.

(assuming a DC signal being applied at the input Vin).

Thanks
 

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It will mostly only affect the maximum output voltage for the typical op amp.
Any change in the open-loop gain generally causes a negligible change in the closed-loop gain.

There is a Power Supply Rejection Ratio in the op amp data sheet that shows the effect of a power supply voltage change on the output voltage.
It's usually pretty small.
 

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