1. 1 W930 EVT System Voltage fail analysis report Prepared: Aaron Date: 2010-03-08

2. 2 Fail item-1 1. Fail item table

3. 3 2. Action: Widen the trace, and test if it is improved.It is also failed.

4. 4 Delete inductor L28 (&L63),it is passed.

5. 5 +1_05V_VCC_EXP,it is passed.

6. 6 Action: 1.Enhance the source voltage of +1_05V_VTT, for example 40mV,change PR187 from 13.3k to 15k.

7. 7 Solution: 1.Enhance the source voltage of +1_05V_VTT, The value of Suggestion 30mV. 2.Improve Layout, Widen the power trace.

8. 8 3. Action: Widen the trace, and test if it is improved. It is passed.

9. 9 PEX_VDD

10. 10 PEX_PLLVDD

11. 11 Action: 1.Enhance the source voltage of +1_05V_VTT, for example 20mV,change PR222 from 3.3k to 3.9k and PR229 from 10k to 11k.

12. 12 Solution: 1.Enhance the source voltage of PEX_VDD, The value of Suggestion 20mV. 2.Improve Layout, Widen the power trace.

13. 13 4. Action: Widen the trace, and test if it is improved. It is passed.

14. 14 Solution: 1.Improve Layout, Widen the power trace.

15. 15 4. Solution: 1.Improve Layout, Widen the power trace.

16. 16