US 7,064,627 B2 · Signal transmission structure having a non-reference region for matching to a conductive ball attached to the signal transmission structure

Abstract

A signal transmission structure is provided. The structure comprises a reference plane, a bonding pad, a conductive trace and a conductive ball. By changing the shapes of the reference plane and the conductive trace, the equivalent capacitance at the conductive ball and the signal route near the conductive ball is reduced, or the equivalent inductance at the conductive ball and the signal route near the conductive ball is increased to compensate the high equivalent capacitance between the conductive ball and the reference plane. Therefore, the impedance of the conductive ball and the signal route near the conductive ball are matched to increase the integrity of the signals after these signals pass through the conductive ball and the signal neighbor route near the conductive ball.

Claims13

Dependent claims

A signal transmission structure, comprising:

a reference plane;
a bonding pad, which is non-coplanar with the reference plane;
a conductive trace non-coplanar with the reference plane, one end of the conductive trace connected to the bonding pad, the conductive trace having a neighbor region with a width smaller than a width of the remainder of the conductive trace;
and
a conductive ball located on a side of the bonding pad, which is apart from the reference plane, wherein an increment of an equivalent inductance between the neighbor region of the conductive trace and the reference plane, can compensate an equivalent capacitance between the conductive ball and the reference plane by providing the neighbor region of the conductive trace with a reduced width.

2 more elements

Dependencies are inferred from the claim text.

Signal transmission structure having a non-reference region for matching to a conductive ball attached to the signal transmission structure

Life of this patent

Signal transmission structure having a non-reference region for matching to a conductive ball attached to the signal transmission structure

Life of this patent

Abstract

Claims13