3-d circuits with integrated passive devices

Abstract

3-D ICs () with integrated passive devices (IPDs) () having reduced cross-talk and high packing density are provided by stacking separately prefabricated substrates () coupled by through-substrate-vias (TSVs) (). An active device (AD) substrate () has contacts on its upper portion (). An isolator substrate () is bonded to the AD substrate () so that TSVs () in the isolator substrate () are coupled to the contacts () on the AD substrate (), and desirably has an interconnect zone () on its upper surface. An IPD substrate () is bonded to the isolator substrate () so that TSVs () therein are coupled to the interconnect zone () on the isolator substrate () and/or TSVs () therein. The IPDs () are formed on its upper surface and coupled by TSVs () in the IPD () and isolator () substrates to devices () in the AD substrate (). The isolator substrate () provides superior IPD () to AD () cross-talk attenuation while permitting each substrate () to have small high aspect ratio TSVs (), facilitating high circuit packing density and efficient manufacturing.