Question

12. The open-loop voltage gain ("A') of an ideal operational amplifier is 1. infinite 2. unity 3. zero 4. inverting 5. non-invertinsg 2 13. If(Vii-Vo)-0 then the output of an ideal operational amplifier is 1. inverting 2. unity 3. infinite 4. zero 5. non-inverting 2

Answer 1

(12)

The open loop volatge gain is

A_OL = V_out / ( V⁺- V^- )

For ideal case, the voltage at the inverting input must be equal to the voltage at the noninverting input.

It implies that voltage input V⁺- V^- = 0, so, open loop voltage gain is infinite

Correct option is (1)

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(13) If input voltages is same, it refers to ideal case,

The amplifiers output will be zero when the voltage difference between the inverting and the non-inverting inputs is zero.

Correct option is (4)