boylistad

Simulate-Analyses-AC Analysis to obtain the AC Analysis dialog box
in which the Start and Stop frequencies will be 10 kHz and the
Selected variable for analysis will be node 5 only. Selecting Simulate
will then result in a magnitude-phase plot with no apparent indicators at
10 kHz. However, this is easily corrected by first selecting one of the
plots by clicking on the Voltage label at the left of the plot. Then select
the Show/Hide Grid, Show/Hide Legend, and Show/Hide Cursors
keys to obtain the cursors, legend, and AC Analysis dialog box. Hook on
the red cursor and move it to 10 kHz. At that location, and that location
only, x1 will appear as 10 kHz in the dialog box, and y1 will be 1.1946
as shown in Fig. 16.38. In other words, the cursor has defined the magnitude
of the voltage across the output capacitor as 1.1946 V or approximately
1.2 V as obtained above. If you then select the Phase curve and
repeat the procedure, you will find that at 10 kHz (x1) the angle is
�142.15° (y1) which is very close to the �142.92° obtained above.
FIG. 16.38
Using the AC Analysis option under Electronics Workbench to determine
the magnitude and phase angle for the voltage V C2 for the network of
Fig. 16.36.
In total, therefore, we have two methods to obtain an ac voltage in a
network—one by instrumentation and the other through the computer
methods. Both are valid, although, as expected, the computer approach
has a higher level of accuracy.
COMPUTER ANALYSIS ⏐⏐⏐ 737