eldo_user

Setting Up An Analysis
Transient Analyses
Transient Analyses
The transient related analyses are:
• “Transient Analysis” on page 217
• “Transient Noise Analysis” on page 241
Transient Analysis
Transient analysis (.TRAN command) is a simulation over a specified time, also called a timedomain
analysis.
Transient output variables (that is, those variables contained within .PRINT and .PLOT
commands in the input description file) are calculated as a function of time over a userspecified
time interval. The initial conditions are automatically determined by a DC analysis
(unless the UIC parameter is specified) with all sources that are not time-dependent being set to
their DC values.
Different types of transient analysis can be specified:
• Point-driven analysis—In the basic form of transient analysis you specify the analysis
duration and the time interval for printing or plotting transient analysis results.
• Parameter-driven analysis—The transient analysis can be performed while sweeping a
parameter or device.
• Data-driven analysis—As an alternative to constant timesteps, you can specify predefined
timestep values in a .DATA command.
Results of a previous simulation can be used as the input to the current simulation by using the
.CHRSIM command.
Multi-threading can be activated for a single DC or transient simulation; Eldo shares computer
resources on a multi-processor machine.
For transient analysis, Eldo analyzes the design by applying the time-domain behavior that you
have specified for all stimulus models (such as voltage sources). To do this, Eldo calculates the
behavior of all models a certain number of times for the duration of the analysis.
Eldo provides sources or stimuli generators. Independent sources can be assigned a time
dependent value for transient analysis. Time dependent functions provided are:
Amplitude Modulation Function
Exponential Function
AM
EXP
Eldo® User's Manual, 15.3 217