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

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2 Fail item-1 1. Fail item table

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

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

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5 +1_05V_VCC_EXP,it is passed.

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

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

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

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9 PEX_VDD

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10 PEX_PLLVDD

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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.

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

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

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

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

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