Problem 5.75 Consider the circuit in Fig. P5.75. Switch S1 begins in the closed
position and opens at t = 0. Switch S2 begins in the open position and toggles
between the open and closed positions every 250 ps. Model this circuit in Multisim
and plot υ0 and υ1 as a function of time until all nodes are discharged below 1 mV.
S2
t=0
1 kΩ
+
2.5 V _
5.5 kΩ
S1
5 fF
10 kΩ
υ0
20 fF
υ1
Figure P5.75: Circuit for Problem 5.75.
Solution: The Multisim circuit is shown in Fig. P5.75(a). Transient analysis
parameters and results are shown in Fig. P5.75(b). For Pulse generator V2, set
Initial Value and Pulsed Value to 1 V and 0, respectively, and set Delay time
= 50 ps, Rise time = 1 ps, Fall time = 1 ps, Pulse width = 1 s, and Period = 2 s.
Similarly, for Pulse generator V3, set Initial Value = 0, Pulsed Value = 1 V,
Delay time = 50 ps, Rise time = 1 ps, Fall time = 1 ps, Pulse width = 250 ps,
and Period = 500 ps. In the Transient Analysis setup, TSTOP = 3 × 10−9 s, and
minimum number of points = 500. Also, Initial Conditions were set to zero.
Figure P5.75(a)
All rights reserved. Do not reproduce or distribute. © 2016 National Technology and Science Press
Figure P5.75(b): Transient Analysis results: V(3) corresponds to υ0 and V(7)
corresponds to υ1 in Fig. P5.75.
All rights reserved. Do not reproduce or distribute. © 2016 National Technology and Science Press