Electric Circuits and Networks, Ist Edition by Pearson

example in this section. Thus, the last rectangular pulse just prior to t  0 would have taken

place 1000 s back. The circuit in the example has a time constant of 1 s. Whatever be the

response value at the end of that pulse, we can expect it to have gone down to zero during

the intervening 999 s before the pulse located at t  0 comes up; –e

–999

is indeed a very

small number. Therefore, the term –i

fr

(0

+

) e

–t

in the solution for 0

+

≤ t ≤ 0.5T

–

can be dropped

because i

fr

(0

+

) will be close to zero. All the more so when T → ∞. Moreover, as T → ∞, the

second solution term in Eqn. 13.1-3 is not needed since the first solution term itself takes

care of the entire ...