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Ideal op-amp has infinite voltage gain because

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in Linear Integrated Circuits by (39.8k points)
Ideal op-amp has infinite voltage gain because

(a) To control the output voltage

(b) To obtain finite output voltage

(c) To receive zero noise output voltage

(d) None of the mentioned

The question was posed to me during a job interview.

This intriguing question originated from Ideal Operational Amplifier topic in chapter Operational Amplifier Characteristics of Linear Integrated Circuits

1 Answer

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by (39.8k points)
The accurate choice is (b) To obtain finite output voltage

In the realm of explanation: As the voltage gain is infinite, the voltage between the inverting and non-inverting terminal (i.e. differential input voltage) is essentially zero for finite output voltage.

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