Investigating PCB traces for fine pitch applications

Surface mounted (SM) components are considered to be dominant in electronics technology. Fine pitch SM components are becoming common due to miniaturization tendencies. Ball Grid Array (BGA) components are classified as fine pitch, if the pitch is 1 mm (39 mil) or smaller [1]. These ICs desire caref...

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Bibliographic Details
Main Authors: Geczy, A, Illyefalvi-Vitez, Z
Format: Conference Proceeding
Language:English
Subjects:
Copper
fine pitch
Geometry
Inductance
on-board inductance
PCB
Resistance
Skin
Skin effect
trace
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Summary:Surface mounted (SM) components are considered to be dominant in electronics technology. Fine pitch SM components are becoming common due to miniaturization tendencies. Ball Grid Array (BGA) components are classified as fine pitch, if the pitch is 1 mm (39 mil) or smaller [1]. These ICs desire careful approach in Printed Circuit Board (PCB) design. In order to compare the electrical performance of PCBs, two PCB interconnection boards were designed with different wiring patterns for a 650 μm pitch commercial BGA. A footprint-compatible dummy BGA was also designed, produced and used to form daisy chain with the PCB patterns. The inductance of the different geometries of the traces on the PCBs and the resistance - varying according to the skin effect at higher frequencies [2] - were calculated and verified by measurements. The skin effect was simulated by Finite Element Method (FEM). The influence of the PCB fabrication deviations was also studied.
DOI:10.1109/SIITME.2010.5653654