Calculating the Gap Mean and Gap Variance Poolsmain topic
Calculating the Gap Mean and Gap Variance PoolsThere are different calculations for the gap pools depending on whether you have specified shift or drift (variation expansion) factors for the elements and which gap specifications are given. See the notation used in the equations below:
|
1. |
Mean shift factor only |
mPool |
s2Pool |
|
No gap specification |
sGap,LT [Zp - Z.BenchGap,LT] |
0 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|
|
|
| ||||||||
|
Lower gap specification only |
sGap,LT [Zp - Z.BenchGap,LT] |
0 | |||||||||
|
|
|
|
| ||||||||
|
Upper gap specification only |
sGap,LT [Z.BenchGap,LT - Zp] |
0 | |||||||||
|
|
|
|
| ||||||||
|
Both gap specifications |
0 |
s2adj,LT - s2Gap,LT * | |||||||||
|
* where if |
|
||||||||||
|
or else, s2adj,LT is the unique solution to: |
| ||||||||||
|
|
|||||||||||
|
2. |
Variation expansion factor only |
mPool |
s2Pool |
|
One or no gap specification |
0 |
|
|
|
Note s2Pool = 0, if T=LSL or T=USL and Zp = 0 | |
|
|
|
|
|
Both gap specifications |
0 |
s2adj,LT - s2Gap,LT |
|
* where if |
|
|||||||||
|
or else, s2adj,LT is the unique solution to: |
| |||||||||
|
|
||||||||||
