# How a symmetrical swing is obtained at the output of Op-amp

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How a symmetrical swing is obtained at the output of Op-amp

(a) Providing amplifier with negative supply voltage

(b) Providing amplifier with positive voltage

(c) Providing amplifier with positive& negative voltage

(d) None of the mentioned

I got this question in an internship interview.

The origin of the question is Operational Amplifier Internal Circuit in portion Operational Amplifier of Linear Integrated Circuits

by (39.8k points)
The accurate answer is (c) Providing amplifier with positive& negative voltage

Let me simplify it: For example, consider a single voltage supply +15v. During positive half cycle the output will be +5v and -10v during negative half cycle.

Therefore, the maximum peak to peak output swing, -5v (-10v) = -15v (Asymmetrical swing).

So, to get symmetrical swing both positive and negative supply voltage with bias point fixed suitably is required.

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