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Given that the PSRR of an op-amp is 120dB. The supply lies between 12V to 15V. Calculate the change in the input offset voltage.

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Given that the PSRR of an op-amp is 120dB. The supply lies between 12V to 15V. Calculate the change in the input offset voltage.

(a) 3μV

(b) ±3μV

(c) ±3×10^-12V

(d) -3V

The question was posed to me in unit test.

Query is from Op-Amp Characteristics topic in portion Op-amps and its Applications of Analog Circuits

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Right choice is (b) ±3μV

Explanation: PSRR = 20log(ΔVS/ΔVIO)

ΔVIO = ±3/10^6 = ±3μV.

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