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Assuming that when the power supply is turned on the capacitor voltage is zero, how long does it take for the amplifier to saturate?

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Assuming that when the power supply is turned on the capacitor voltage is zero, how long does it take for the amplifier to saturate?

(a) 3s

(b) 6s

(c) 9s

(d) 12s

This question was addressed to me in unit test.

The doubt is from DC Imperfections in Operational Amplifiers topic in section Operational Amplifiers of Electronic Devices & Circuits

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Best answer
The correct choice is (b) 6s

Easy explanation: Use vO = VOS

(VOS/CR)t.

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