GENERATIONS OFSYSTEMMOMENTSMETHOD:

SD O

FRESISTORVALUE

dr/dRs

=

L / CD

=

50 / 7.492

=

6.674

Variance of R due to Rs

=

[(dR/dRs)*Srs]^2

=

(6.674*3.55)^2

=

561.3

dR/dCD

=

- Rs* L / (CD)^2

=

- (196)*(50) / (7.492)^2

=

-174.6

Variance of R due to CD

=

[(dR/dCD)*Scd]^2

=

(-174.6*.371)^2

=

4195.7

Variance of R

=

561.3

+

4195.7

=

4757;

Stdev of R

=

Sqrt (4757)

=

69.0

Relativeimportanceof input parametersfor resistorvariability:

[!]

4195.7 / 4757

88%

of resistor variance is due to CD variability