Patent ID: 6350386
Filing Date: 2002-02-26
Classification: H01L,Y10S,Y10T

Abstract:
A method of manufacturing a support circuit, comprising:providing a conductive layer with top and bottom surfaces; providing a top etch mask on the top surface that includes an opening that exposes a portion of the top surface; providing a bottom etch mask on the bottom surface that includes an opening that exposes a portion of the bottom surface; applying an etch to the exposed portion of the top surface through the opening in the top etch mask, thereby etching partially but not completely through the conductive layer and forming a recessed portion in the conductive layer below the top surface; forming an insulative base on the recessed portion without forming the insulative base on the top surface; applying an etch to the exposed portion of the bottom surface through the opening in the bottom etch mask, thereby forming a routing line in the recessed portion; applying an etch to the insulative base to form an opening in the insulative base that exposes a portion of the recessed portion; applying an etch to the exposed portion of the recessed portion through the opening in the insulative base, thereby forming an opening in the recessed portion with tapered sidewalls; and providing an opening in the routing line using the opening in the recessed portion.