14 DYNAMIC CIRCUITS WITH APERIODIC INPUTS – ANALYSIS BY FOURIER TRANSFORMS
Therefore, the effect of multiplying 2e
–0.5t
u(t) by sin100twill be to shift half its magnitude
spectrum, each to
ω ⫽
±100 rad/s and add. The value of Fourier transform of 2e
–0.5t
u(t)
will be negligibly small at 100 rad/s, and hence, the overlap between the two shifted
copies will be negligible. Therefore, the new signal will have an energy density spectrum
which is the same as the two copies of energy spectral density of 2e
–0.5t
u(t) located at
ω ⫽
±100 rad/s with a scaling factor of 0.25. Total energy content in a signal is the area
under its energy spectral density curve. ...
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