Ground arch for wirebond ball grid arrays
View Patent ↗A structure provides for the control of bond wire impedance. In an example embodiment, there is an integrated circuit device comprising a semiconductor device die having a plurality of grounding pads, signal pads, and power pads and a package for mounting the integrated circuit and includes a conductive path having at least one reference trace that surrounds the integrated circuit. A grounding arch is disposed over the semiconductor device die.
1. A method for controlling impedance of bond wires in packaging a semiconductor device die in a package, the method comprising:
defining locations of signal and power/ground pads on the device die; defining grounding trace locations on the package; bonding the signal pads and power/ground pads of the device die; providing a conductive path including a ground arch over the bond wires and grounding trace locations, rotating the package a predetermined amount and providing an additional ground arch; and encapsulating the device die and the ground arch and additional ground arch.
2. The method of claim 1 wherein the pre-determined rotation amount is about 90 degrees.
3. The method of claim 1 , wherein providing an additional ground arch is a function of device design, package size, number of wire bonds, and a desired impedance.
4. The method of claim 3 , wherein the desired impedance is function of a ground arch distance from a wire bond.