The key to the above derivation was our knowledge of step response of series RC
circuit. The input could be thought of as a sequence of unit steps and hence the output could
be strung together employing step response and zero-input response segments. Square waves
and more generalised versions of it (the so-called rectangular pulse waveforms that are
‘squarish’ waveforms with unequal half-cycle duration and unequal positive and negative
amplitudes) appear very frequently in Pulse Electronics ...
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