eldo_user

Specifying Simulation Output
Safe Operating Area Examples
• The following example checks a model; it checks for all transistors abs(IDS) > 10μA for
more than 3ns, during the first 50 ns:
.SETSOA M NMOS ID(*)=(-10u,10u,3n)
.CHECKSOA TSTART=0 TSTOP=50n
The following results will be generated in the .chi file:
*| ID(X1.M2)
*| X AXIS WINDOW: [ 10.35049N 14.29079N ]
*| Both MIN (-1.000000e-05) and
*| MAX (1.00000e-05) values violated
*| for more than 3.00000N
*| X AXIS WINDOW: [ 30.35063N 34.29079N ]
*| Both MIN (-1.000000e-05) and
*| MAX (1.00000e-05) values violated
*| for more than 3.00000N
Total number of SOA instances : 1
Total number of violations : 2
• The following example checks an expression; it checks the absolute value of the sum of
2 Nmos drain currents < 100μA:
.SETSOA E ABS(ID(X1.M2)+ID(X2.M2)) = (*,100U)
.CHECKSOA
The following results will be generated in the .chi file:
*|ABS(ID(X1.M2)+ID(X2.M2))
*| X AXIS WINDOW: [ 10.44101N 46.03154N ]
*| Value superior to 1.000000e-04
Total number of SOA instances : 1
Total number of violations : 1
• The following is an example of SOA check syntax for device parameters (D), model
parameters (M) and Eldo expressions (E):
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Eldo® User's Manual, 15.3