Figure 7.21: Creating the V-T curves in a behavioral model.
Generally, the simulator will construct intermediate I-V curves other then the input I-V curve
to be used during voltage transitions. The intermediate curves will be chosen such that the
time behavior during the transition will mimic the V-T curve input to the model. This behavior
is illustrated in
Figure 7.22
. Note in the V-T curve shown in
Figure 7.22
that there is no data
point near the threshold (generally, V
dd
/2) at which timing is measured. This may induce a
timing inaccuracy, depending on how the simulator (or the model maker) extrapolated points
on the V-T curve near the threshold. Generally, models should be defined with at least one
point at or near the timing threshold.
Figure 7.22: Example of how the I-V and V-T curves interact.
Summary :
Figure 7.21: Creating the V-T curves in a behavioral model. The intermediate curves will be chosen such that the time behavior during the transition will mimic the V-T curve input to the model.
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cure,figure,cures,threshold,near,model,timing,722,generally,during,point,behaior,simulator