eldo_user

Optimization
Designing a Low Noise Amplifier (LNA)
.PARAMOPT
+ CPIN1=(0.1P,0.10P,10P)! 0.1x10-12 ≤ CPIN1 ≤ 10x10-12
+ CPIN2=(0.1P,0.10P,10P)! 0.1x10-12 ≤ CPIN2 ≤ 10x10-12
+ LSIN=(0.1N,0,30N)! 0 ≤ LSIN ≤ 30x10-9
+ CSIN=(1P,0.10P,10P)! 0.1x10-12 ≤ CSIN ≤ 10x10-12
+ LS=(0.25N,0,3N,0.25N)! 0 ≤ LS ≤ 3x10-9
+ N1=(30,10,50,5)! 10 ≤ N1 ≤ 50
The degenerative integrated inductor (LS) would typically come from a design kit library. In
our context, it is useful to specify the unit step (0.25n) to obtain the optimal matching inductor.
Design Objectives and Extracted Measures
To specify design objectives, the keyword GOAL is used on the .EXTRACT command, this
describes the ideal target that the user would like to reach for this specification with the
optimization process.
* AC Analysis
.EXTRACT AC LABEL=AV_dB@2.4GHz YVAL(WR(AV_DB),2.4G) GOAL=20
.EXTRACT AC LABEL=AV_dB@2.5GHz YVAL(WR(AV_DB),2.5G) GOAL=20
.EXTRACT AC LABEL=S11_dB@2.4GHz YVAL(SDB(1,1),2.4G) GOAL=-15
.EXTRACT AC LABEL=S11_dB@2.5GHz YVAL(SDB(1,1),2.5G) GOAL=-15
* Noise Analysis
.EXTRACT NOISE LABEL=NF_dB@2.4GHz YVAL(DB(SNF),2.4G) GOAL=MINIMIZE
.EXTRACT NOISE LABEL=NF_dB@2.5GHz YVAL(DB(SNF),2.5G) GOAL=MINIMIZE
.EXTRACT NOISE LABEL=NFMIN_dB@2.4GHz YVAL(DB(NFMIN),2.4G) GOAL=MINIMIZE
.EXTRACT NOISE LABEL=NFMIN_dB@2.5GHz YVAL(DB(NFMIN),2.5G) GOAL=MINIMIZE
The specified design objectives are for an optimization problem having four GOAL objectives
and four MINIMIZE objectives.
Optimization Process
The optimization process stops when the accuracy on the design variables need not be improved
further, or more precisely, when the current point satisfies the optimality condition. This
optimality property can be checked in the Eldo optimizer output (.otm file):
666
Eldo® User's Manual, 15.3