What class of amplifier is distinguished by the presence of output throughout the entire signal cycle and the input never goes into the cutoff region?

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Class A amplifiers have the active device biased to conduct for the entire input cycle, so the output is present throughout the whole waveform. Since the device never turns off, the signal remains proportional and the amplification is very linear with minimal distortion. The trade-off is efficiency: constant current flow means more power is wasted as heat, even when there’s no input. This is why Class A is prized for fidelity in RF stages, though it’s less efficient than other classes. In contrast, other classes rely on conduction ending before the cycle ends or on switching, which increases efficiency but can introduce more distortion. So the description of output existing for the full cycle and no input cutoff points to Class A.