14.1 APERIODIC WAVEFORMS
All inputs get switched on to the circuit at some time-instant and get switched off or removed from the circuit at some other time-instant in practice. Hence, all waveforms applied to circuits are aperiodic in practice. However, in steady-state studies, we may assume that the input is applied at t = 0, but not removed later. In that case, we have an aperiodic waveform that is semi-infinite in time. A periodic waveform switched on to the circuit at t = 0 is an example of an aperiodic input that is semi-infinite in time-domain. Such an aperiodic input has finite average power over a cycle, infinite duration and infinite energy - power and energy in the context of waveforms are to be understood as normalised power and normalised ...
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