AND8327/D
Vsweep
AC = 1
5
X3
AMPSIMP
+
5.0 V
C4
4.99 V
L1
1 kH
Vdd
5.0 V
+
FB
10
4
5
9
-
2
4.99 V
+
Rpullup
20 k
2.5 V
1 kF
Rled
1 k
R2
10 k
8
+
V2
2.5
3
1
FB
2.49 V
4.87 V
VFB
X1
Optocoupler
2.5 V
C2
10 n
3.79 V
C1 100 nF
6
U1
TL431
R3
10 k
Figure 8. The Fast Lane Sweep Requires a Clear Separation between Both Lanes
Vbias
5
X3
AMPSIMP
+
5.0 V
4.99 V
L1
1 kH
Vdd
5.0 V
+
-
FB
10
4
5
9
2
4.99 V
+
2.5 V
Rled
1 k
R2
10 k
C3
1 kF
8
Rpullup
20 k
+
V2
2.5
3
7
1
FB
2.49 V
4.87 V
0 V
+
VFB
X1
Optocoupler
2.5 V
Vsweep
AC = 1
C2
10 n
3.79 V
C1 100 nF
6
U1
TL431
R3
10 k
Figure 9. In the Slow Lane Sweep, the Fast Lane Input Goes to a Fixed dc Bias
SPICE offers the possibility to extract the imaginary and
real parts from an ac simulation. This is what Figureꢀ10
shows where the real curves of both the fast and slow sweeps
have been gathered in the upper portion. The lower section
of the figure contains the imaginary portions of both lanes.
The graphical viewer can easily manipulate waveforms and
the sum of both imaginary and real curves already appears
on the picture.
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5
ETC [ ETC ]
