Patent ID: 7719093

Claim:
A circuit board including a source interconnect and a ground interconnect, the circuit board having a two-dimensional geometry having a corner, a plurality of protruding portions being provided in circumferences of said source interconnect and said ground interconnect in regions except said corner in plan view, the plurality of said protruding portions in said source interconnect being connected to a first terminal of a plurality of decoupling capacitors, each of said protruding portions in said source interconnect being connected to a different one of said decoupling capacitors, the plurality of said protruding portions in said ground interconnect being connected to a second terminal of said decoupling capacitors, each of said protruding portions being connected to a different one of said decoupling capacitors; wherein said protruding portions each has a tip, and said decoupling capacitors is located in said tips of said respective protruding portions, and wherein high frequency source noise from said source interconnect and high frequency ground noise from said ground interconnect converge to said protruding portions due to said protruding portions being provided in said regions except said corner, while low frequency source noise from said source interconnect and low frequency ground noise from said ground interconnected converge to said corner due to said protruding portions being provided in said regions except said corner.