Patent ID: 7964802

Claim:
An interposer for decoupling a microchip on a circuit board, said interposer comprising: structured metal layers, on a top and a bottom surfaces of the interposer, configured to attach the microchip and the circuit board to the interposer; two sets of mutually isolated metal structures, inside the interposer, extending substantially perpendicular to the top and the bottom surfaces of the interposer; such that, a first set extends closer towards the top surface than a second set, and said second set extends closer towards the bottom surface than said first set, and each of said two sets of mutually isolated metal structures are arranged in a regular, two dimensional array pattern, the first set alternating with the second set in at least one horizontal direction, such that adjacent metal structures have a spacing which is smaller than a pitch of two connections of the microchip, said spacing including a width of a first metal structure plus a distance between the first metal structure and an adjacent second metal structure, the first metal structure and the adjacent second metal structure being metal strips having lengths in which a portion of a length associated with the first metal structure overlaps a portion of a length associated with the adjacent second metal structure, wherein said structured metal layers and said mutually isolated metal structures are structured to form capacitors, each capacitor having a portion of a top metal layer electrically connected to some of the metal structures of the first set and a portion of a bottom metal layer electrically connected to adjacent metal structures of the second set, and each capacitor having a variable capacitance based on a position of the portion of the top metal layer relative to a position of the portion of the bottom metal layer.