eldo_user

Safe Operating Area (SOA) Checks
Specifying Simulation Output
Safe Operating Area (SOA) Checks
You can detect when a component is used outside safe operating area (SOA) limits. The SOA
can also be used to verify min-max measurements. A warning will be generated during the
simulation and displayed to the standard output and inside the .chi file. You can specify a
separate file to write SOA results to. They can also be plotted for display in EZwave.
Tip
You can view safe operating area violations with the AMS Results Browser.
Two commands are available for use with specifying and checking the safe operating area:
• .SETSOA
Specifies the safe operating area limits for devices, model parameters, or expressions.
This can be defined in the netlist or any device library.
See “.SETSOA” in the Eldo Reference Manual.
• .CHECKSOA
Checks the safe operating area limits previously set using .SETSOA.
See “.CHECKSOA” in the Eldo Reference Manual.
Plotting Safe Operating Area Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341
Safe Operating Area Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 345
Plotting Safe Operating Area Limits
Use the output quantity SOA(identifier) for .PLOT and .PROBE commands. This quantity only
applies to .wdb (EZwave) output because it creates an assertion bus type object. The following
syntaxes can be specified to create assertion buses:
• Generic command:
.probe [analysis] SOA
This will probe all .SETSOA commands in a design.
• SOA output quantity for subcircuit instance:
.probe|.plot SOA(xinst)
This will probe/plot all .SETSOA commands inside subcircuit instance named xinst.
• SOA output quantity for device:
.probe|.plot SOA(device)
Eldo® User's Manual, 15.3 341