eldo_user

Statistical Experimental Design and Analysis
Determining the List of Noise Parameters
* CIRCUIT
V1 1 0 DC 0 AC 1
R1 1 2 ’R1 + D_R1’
R3 2 0 ’R3 + D_R3’
C2 2 INN ’C + D_C’
C3 2 OUT ’C + D_C’
R2 OUT INN ’R2 + D_R2’
Y1 OPAMP1 0 INN OUT 0 PARAM: GAIN=’GAIN + D_GAIN’ P1=’P1 + D_P1’
* DETERMINISTIC PARAMETERS.PARAM R1 = 159K R2 = 3.18MEG R3 = 79.5
+ C = 1U
+ P1 = 10 GAIN = 10E6
* NOISE PARAMETERS
.PARAM D_R1 = AGAUSS( 0, 10.6K, 1)
.PARAM D_R2 = AGAUSS( 0, 0.212MEG, 1)
.PARAM D_R3 = AGAUSS( 0, 5.30, 1)
.PARAM D_C = AGAUSS( 0U, 0.067U, 1)
.PARAM D_P1 = AGAUSS( 0, 0.667U, 1)
.PARAM D_GAIN = AGAUSS( 0, 0.667E6, 1)
Modify the netlist by adding the following .DEX command:
.DEX
+ EXPERIMENT=SCREENING_NOISE
+ DESIGN=ORTHA_2_N
+ RESPONSE=OPGAIN,OPFREQ,OPBW
+ FIND_FACTOR
By running Eldo on the modified netlist, a .dex file is generated containing the list of noise
parameters as follows:
List of candidates for the DEX analysis
---------------------------------------
Noise Factor(s) Dummy Distrib Nominal Dev/Range
Name
Value
D_GAIN SIG=1 N1 Gaussian 0.0000e+00 6.6700e+05
D_P1 SIG=1 N2 Gaussian 0.0000e+00 6.6700e-07
D_C SIG=1 N3 Gaussian 0.0000e+00 6.7000e-08
D_R3 SIG=1 N4 Gaussian 0.0000e+00 5.3000e+00
D_R2 SIG=1 N5 Gaussian 0.0000e+00 2.1200e+05
D_R1 SIG=1 N6 Gaussian 0.0000e+00 1.0600e+04
And the following .PARAMDEX statement is generated in the file filter_paramdex.inc:
.PARAMDEX
+ D_GAIN NOISE/SIG=1.0
+ D_P1 NOISE/SIG=1.0
+ D_C NOISE/SIG=1.0
+ D_R3 NOISE/SIG=1.0
+ D_R2 NOISE/SIG=1.0
+ D_R1 NOISE/SIG=1.0
You can use this generated information to prepare the .PARAMDEX statements.
Eldo® User's Manual, 15.3 571