eldo_user

Optimization
References
You can combine both PASSFAIL and DICHOTOMY methods in one step with the following
syntax:
.OPTIMIZE METHOD=DICHOTOMY
.EXTRACT tran LABEL=DCP
+ (XUP(V(Q),0.48,200N,300N,1) - XUP(V(CP),0.48,200N,300N,1))
+ GOAL={1.1*TCO_NOMINAL}
.PARAMOPT TIC=(201N,195N,205N)
The secant method search algorithm is more advanced than the dichotomy method. Many
problems suitable for dichotomy (one design parameter, one target) are actually relatively
linear, that is, the target value is almost proportional to the design variable. In these conditions,
using the dichotomy method is clearly suboptimal in terms of the number of iterations required.
Using the secant method will greatly diminish the number of iterations. This feature is useful if
you want to accelerate your setup/hold simulations.
Related Topics
Eldo Optimization Methods
Specifying Design Variables
Specifying Design Objectives Using .EXTRACT
References
Articles referenced in this chapter:
1. J.F. Bonnans, J. Ch. Gilbert, C. Lemarechal, C. Sagastizabal. Numerical Optimization
-Theoretical and Practical Aspects. Springer Verlag, Berlin, 2003.
2. R. Fletcher. A general quadratic programming algorithm. Journal of the Institute of
Mathematics and its Application, 7, 76-91, 1971.
3. R. Fletcher. Practical Methods of Optimization (second edition). John Wiley & Sons,
Chichester, 1987.
4. P. E. Gill, W. Murray, and M. H. Wright. Practical Optimization. Academic Press, New
York, 1981.
5. J. Nocedal and S. W. Wright. Numerical Optimization. Springer Series in operations
Research, Springer, New York, 1999.
6. R. Point, M. Mendes and W. Foley. A differential 2.4GHz Switched-Gain CMOS LNA
for 802.11b and Bluetooth. 2002 IEEE Radio and Wireless Conference.
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Eldo® User's Manual, 15.3