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IMPEDANCE DISCONTINUITIES REFLECT ENERGY

Overview of Backdrilling, Gisin and Stepinski, Sanmina-SCI 15 mil stub length

6.25 Gb/s estimates

Stackup and Construction Technique Determine the Via Construction

Foil – Multi-laminations Cap – Single Lamination

Stac acke ked Stag agger ered Las aser er F Formed Vias ias

Laminate Drill Dry Mask Electr

• plate

Strip Etch

All Mechanical Vias are Created in a through-hole process. Through Hole Vias become blind and buried after lamination

Core Manufactured Copper-clad fiberglass More Fiberglass / Less Resin Better Signal & Power Integrity Less Z-Axis variation Prepreg Fiberglass and Uncured Resin / no copper Less Fiberglass / More resin More Z-Axis Variation

• M48

; CONTROL DEPTH DRILL FILE 1 OF 2 ; DRILL LAYER 1-11 DO NOT CUT 12 FMAT, 2 INCH T1C0.0140 % G90 G05 T1 X3.082Y2.754 X3.234Y4.711 X2.934Y2.223 X3.293Y1.137 M48 ; CONTROL DEPTH DRILL FILE 2 OF 2 ; DRILL LAYER 1-5 DO NOT CUT 6 FMAT, 2 INCH T1C0.0140 T2C0.0100 % G90 G05 T1 X5.549Y2.201 X5.549Y2.221 T2 X3.247Y0.284 README THERE ARE 2 CONTROL-DEPTH DRILL FILES MAXIMUM STUB LENGTH 10 MILS

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