Electronics - Operational Amplifiers - Discussion


A noninverting closed-loop op-amp circuit generally has a gain factor:

[A]. less than one
[B]. greater than one
[C]. of zero
[D]. equal to one

Answer: Option B


No answer description available for this question.

Vatsala Sharma said: (May 20, 2011)  
The gain of non inverting amplifier exceeds the gain of inverting amplifier by unity.

Pushp Raj said: (Aug 10, 2011)  
Positive feedback always has gain more than unity.

Praka said: (Oct 3, 2011)  
Negative feed back always decrease the gain of system.

Muthuraja said: (Jan 21, 2012)  
The formula is 1+Rf/R1 . We know that Rf > R1 . So it is always greater than one

Swapna said: (Jul 4, 2012)  
Gain Av= 1+ (Rf/R).

Even if feedback resistance is less i.e. Rf<R. The gain will be always greater than 1.

Karan Arora said: (Jan 9, 2016)  
For Positive Feedback circuit, Gain is = A/(1-A. B).

Hence denominator will be less than 1 always and so gain will be more than 1 always whereas for negative feedback circuit, gain is = A/(1+A.B).

Hence denominator will be more than 1 always and so gain will be less than 1 always.

All the Best.

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