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830 ⏐⏐⏐ NETWORK THEOREMS (ac)
the dc source should be quite straightforward at this point. For the ac
source, be sure to double-click on the source symbol to obtain the
Property Editor dialog box. Then set AC to 4 V, FREQ to 1 kHz,
PHASE to 0°, VAMPL to 4 V, and VOFF to 0 V. In each case choose
Name and Value under the Display heading so that we have a review
of the parameters on the screen. Also, be sure to Apply before exiting
the dialog box. Obtain the VPRINT1 option from the SPECIAL
library, place it as shown, and then double-click to obtain its Property
Editor. The parameters AC, MAG, and PHASE must then recieve the
OK listing, and Name and Value must be applied to each under
Display before you choose Apply and OK. The network is then ready
for simulation.
After you have selected the New Simulation Profile icon, the New
Simulation dialog box will appear in which SuperpositionAC is
entered as the Name.Following the selection of Create,theSimulation
Settings dialog box will appear in which AC Sweep/Noise is selected.
The Start and End Frequencies are both set at 1 kHz, and 1 is entered
for the Points/Decade request. Click OK, and then select the Run
PSpice key; the SCHEMATIC1 screen will result with an axis extending
from 0.5 kHz to 1.5 kHz. Through the sequence Trace-Add Trace-
V(R3:1)-OK, the plot point appearing in the bottom of Fig. 18.98 will
result. Its value is slightly above the 2-V level and could be read as
2.05 V which compares very nicely with the hand-calculated solution of
2.06 V. The phase angle can be obtained from Plot-Add Plot to Window-
Trace-Add Trace-P(V(R3:1)) to obtain a phase angle close to �33°.
Additional accuracy can be added to the phase plot through the sequence
Plot-Axis Settings-Y Axis-User Defined �40d to �30d-OK, resulting
in the �32.5° reading of Fig. 18.98— again, very close to the hand cal-
FIG. 18.98
The output results from the simulation of the network of Fig. 18.97.
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