Discussion
Why is a square wave a useful test of an amplifier's response?
Answer: D
The edges carry the high-frequency content and the flat tops the low, so overshoot or rounding on the edges and droop or tilt on the tops report on the two ends of the response in one observation. The odd-harmonic content and the ease of measurement are true but incidental, and a square wave's spectrum is not a step's. A single test that reports on two independent specifications is worth far more than two tests, which is why the square wave is reached for first.
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