Electronics and Communication Engineering - Exam Questions Papers - Discussion
Discussion Forum : Exam Questions Papers - Exam Paper 17 (Q.No. 38)
38.
The circuit shown in the figure is used to charge the capacitor C alternately from two current sources as indicated. The switches S1 and S2 are mechanically coupled and connected as follow
For 2nT ≤ t < (2n + 1)T, (n = 0, 1, 2, ...) S1 to P1 and S2 to P2
For (2n + 1) T ≤ t < (2n + 2)T, (n = 0, 1, 2, ...) S1 to Q1 and S2 to Q2
Assume that the capacitor has zero initial charge. Given that u(t) is a unit step function, the voltage Vc(t) across the capacitor is given be
For 2nT ≤ t < (2n + 1)T, (n = 0, 1, 2, ...) S1 to P1 and S2 to P2
For (2n + 1) T ≤ t < (2n + 2)T, (n = 0, 1, 2, ...) S1 to Q1 and S2 to Q2
Assume that the capacitor has zero initial charge. Given that u(t) is a unit step function, the voltage Vc(t) across the capacitor is given be
(- 1)n tu(t - nT)u(t) + 2 (-1)n u(t - nT)
(-1)n u(t - nT)tu(t) + 2 (-1)n (t - nT) u(t - nT)
(-1)n (t - nT) u(t - nT)[0.5 - e-(t - 2nT) + 0.5e-(t - 2nT - T) ]Discussion:
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