Patent ID: 7803714

Claim:
A method, comprising: providing a substrate having a first conductive catch pad and a second conductive catch pad formed thereon; securing the substrate to an overlying wafer carrier; performing a laser etch on the substrate underlying each of the first conductive catch pad and the second conductive catch pad to form a first partial through-substrate via of a first via diameter underlying the first conductive catch pad and a second partial through-substrate via underlying the second conductive catch pad of a second via diameter that differs from the first via diameter by selectively exposing the substrate to a laser to form the second via diameter different from the first via diameter; performing a reactive ion etch (RIE) on the substrate to continue etching the first partial through-substrate via to form a first through-substrate via to the first conductive catch pad and to continue etching the second partial through-substrate via to form a second through-substrate via to the second conductive catch pad, each of the first through-substrate via and the second through-substrate via having a same depth; and forming a smaller of the first via diameter and the second via diameter in a digital logic circuit and forming a larger of the first via diameter and the second via diameter in analog circuitry.