Datasheet

Data Sheet AD633
Rev. K | Page 13 of 20
MODEL RESULTS
Circuit simulation using SPICE models embedded in various
application formats such as PSPICE, Multisim, and SIMetrix is a
popular and efficient method of assessing the integrity of a
circuit before creating the printed circuit board in which the
circuits are ultimately used. Although impossible to
demonstrate all of the multiplier functions in every available
program, Figure 24 through Figure 41 demonstrate how the
schematic and graph for simple dc, sin
(x), and pulse
applications appear in three popular SPICE programs. If a
simulator is not shown here, a good way to progress is to start
with a basic dc circuit to verify that the circuit converges and
then continue with waveforms that are more complex. When
analyzing nonlinear devices such as multipliers, the most
common simulation issue is convergence, the iterative process
by which SPICE seeks the initial dc bias condition before
completely solving the circuit and displaying a graph.
Figure 24 through Figure 41 are arranged schematic first,
followed by the graphic result. If the user has a problem with a
simulator, the most efficient fix is to contact applications
support for the program in use.
EXAMPLES OF DC, SIN, AND PULSE SOLUTIONS
USING MULTISIM
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Figure 24. Circuit to Multiply Two Integers Schematic Created in Multisim
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Figure 25. Circuit to Multiply Two Integers Response Graph Displayed in Multisim
(2 V × 4 V)/10 V = 0.8 V
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Figure 26. Frequency Doubler Circuit Schematic Created in Multisim
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Figure 27. Frequency Doubler Response Graph Displayed in Multisim
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Figure 28. Pulse Circuit Schematic Created in Multisim
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Figure 29. Pulse Circuit Response Graph Displayed in Multisim