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Optimization
Design Objectives for Multi-Point Simulation
Design Objectives for Multi-Point Simulation
This section explains how to specify design objectives based on multi-point simulations for
small-signal analysis and transient analysis. It is not relevant for DC-based design objectives.
It starts by explaining the notion of implicit and explicit data points for multi-point simulations,
then describes how to specify design objectives for multi-point analysis. This section covers:
Implicit and Explicit Data Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 618
Specifying Design Objectives with Explicit Data Points . . . . . . . . . . . . . . . . . . . . . . . . . 619
Implicit and Explicit Data Points
Restrictions ensure a reasonable connection is maintained between simulation statements and
optimization objectives. These limitations are based on two categories of multi-point analysis:
analysis with implicit data points, and analysis with explicit data points:
• Transient analysis may have implicit data points where Eldo computes the data points
for accuracy. For example:
.TRAN TPRINT TSTOP [TSTART [HMAX]]
For transient and the small-signal analyses, time and frequency are implicit data points.
• Transient and AC analyses may alternatively have explicit data points where the data
points are specified. For example:
.TRAN DATA=DATA_NAME
The explicit case is favored because it enables the simulation and the optimization commands to
refer to the same list of data. For transient and the small-signal analyses, frequency and time
must be included in the explicit set of simulation data points when optimization is required.
These limitations are related to the algorithm implemented in the Eldo optimizer SQP method.
For more information refer to the topic “Smooth and Non-Smooth Problems” on page 631.
Related Topics
Specifying Design Objectives Using .EXTRACT
Specifying Design Objectives Using .OBJECTIVE
Types of Design Objective
Specifying Design Objectives with Explicit Data Points
Scaling Design Objectives
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Eldo® User's Manual, 15.3