User`s guide

2
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28 Simulation Examples
Note
The difference in
g
ain is apparent. You can also
plot the difference of the waveforms for runs 21
and 1 and then use the search commands feature
to find certain characteristics of the difference.
4
Plot the new trace by specifying a waveform expression:
a
From the Trace menu, select Add.
b
In the Trace Expression text box, type the following
waveform expression:
Vdb(Out)@1-Vdb(OUT)@21
c
Click OK.
5
Use the search commands feature to find the value of the
difference trace at its maximum and at a specific frequency:
a
From the Tools menu, point to Cursor, then select
Display.
b
Right-click then left-click the trace symbol (triangle)
for Vdb(Out)@1 - Vdb(Out)@21. Make sure that you
left-click last to make cursor 1 the active cursor.
c
From the Tools menu, point to Cursor, then select Max.
d
From the Tools menu, point to Cursor, then select
Search Commands.
e
In the Search Command text box, type the following:
search forward x value (100)
f
Choose 2 as the Cursor to Move option.
g
Click OK.
Figure 2-24 shows the Probe window when the cursors are
placed.
Note that the Y value for cursor 2 in the cursor box is about
17.87. This indicates that when R1 is set to 10 kΩ, the small
signal attenuation of the circuit at 100 Hz is 17.87 dB greater
than when R1 is 100 Ω.
6
From the Tools menu, point to Cursor, then select Display
to deactivate the cursors.
7
Delete the trace.
or press I
The search command instructs
Probe to search for the point on
the trace where the x-axis value
is 100.