Normalizing Throughput Yield - Wilson Consulting Services, LLC
Normalizing Throughput Yield
White Paper
WP-1
Normalizing Throughput Yield
"A Practical Guide for Yield Normalization"
A White Paper
by
David C. Wilson, MSEE
Wilson Consulting Services, LLC December 23, 2004
WP-1: DCW_Normalizing Throughput Yield 12-23-04
Page 1-16
Wilson Consulting Services, LLC
Normalizing Throughput Yield
Abstract
ABSTRACT
This paper provides a practical exercise for yield normalization using real data from a production line. The name of the company has been removed from this report for proprietary reasons. The intended audience is manufacturing, quality, and test engineering interested in evaluating operation and throughput yields. This information is being provided as result of the author's observations and a review of production yield data.
Yield is a measure of quality of a product relative to the manufacturing line. It is the fraction of total elements processed, which result in a good product. Production processes in manufacturing industries require yield parameters for making decisions of the goodness of the product. Therefore, yield data parameters are good measures of product performance as it is being produced. Data from products in the field provide another important source of information, which describes or predict its performance over time. Field data can be used both with statistical methodologies, plus some of the unfamiliar distributions such as Weibull, lognormal, exponential, gamma models, etc. Nevertheless, all of these
models call for inferences that involve extrapolation.
Wilson Consulting Services, LLC
WP-1: DCW_Normalizing Throughput Yield 12-23-04
Page 2-16
Normalizing Throughput Yield
Table of Contents
Description
Page
1.0: Introduction _______________________________________4 - 16
2.0: Summary _________________________________________5 - 16
3.0: Cumulative & Operation Yield_________________________9 - 16
4.0: Normalized Yield___________________________________10-16
5.0: Yield Scorecard____________________________________14 -16
WP-1: DCW_Normalizing Throughput Yield 12-23-04
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Normalizing Throughput Yield
Introduction
1.0 Introduction
Objective: ? To measure throughput yield in production with a comparative analysis of the
cumulative versus the normalized methods.
Data Source: ? Examples were taken from April 2003 Monthly Quality Yield Report.
Software Tools ? Excel ? Minitab
Definition of Yield: ? Yield is a measure of quality of a product relative to the manufacturing line.
WP-1: DCW_Normalizing Throughput Yield 12-23-04
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Normalizing Throughput Yield Introduction ? cont'd
Definition of Terms used
Y e ? Throughput yield : = -DPU TP
? Defects per unit : DPU = - ln(Y )
m
Y Y ? Rolled throughput or cum yield : =
RTY
TPi
i =1
( ) Y ? Total Defect per Unit : TDPU = - ln RTY
Y Y Y ? Normalized yield :
=m
or m
norm
RTY
cum
(Y ) ? Defect per normalized unit : DPU norm = - ln norm
?FPY n : for period yield n
WP-1: DCW_Normalizing Throughput Yield 12-23-04
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