ccd wrote on Sep 26th, 2006, 11:15am:Without dummies, I don't understand why ABBA is better than ABAB when Bs see two surrounding As and Bs don't. So, different stress effects on the two groups.
If you think of linear process/temperature gradient going across the array, then ABBA is better than ABAB. For simplicity, lets assume A and B are resistors and sheet resistance increase linearly left to right (either due to stress or temperture gradient) then the net value of both As will equal the B value better in an ABBA whereas the ABAB array will have B at a higher value.