eldo_user

IBIS Models Support in Eldo
Buffers
Figure 17-8. Example Analog-Only Model init Using an I/O Buffer
Series Buffers
Series and Series_switch buffers can be passive circuits containing various combinations of
inductors, resistors and capacitors, as well as the steady state I-V characteristics of non-linear
devices such as diodes and transistors.
Series and Series_switch are identical in their elements, the only difference is that the latter one
can be switched ON or OFF. The IBIS specifications do not define the transition characteristics
of a Series_switch. Switches are assumed to either be ON or OFF during a simulation, and I-V
characteristics could be defined for either or both states. Switching does not occur during
simulation, but you must decide whether the element is ON or OFF before the simulation starts.
The electrical models for the Series / Series_switch are:
• R Series, L Series, Rl Series, C Series, Lc Series and Rc Series
These enable IBIS to model simple passive models and/or parasitics. The model is
shown in Figure 17-9.
Figure 17-9. Simple Passive Modeling
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Eldo® User's Manual, 15.3