Use of Wide-Line Entry for Landless Internal Via Connection
Original Publication Date: 1985-Feb-01
Included in the Prior Art Database: 2005-Feb-18
The figure shows a wide-line entry for a landless internal via connection. Using wide-line entry allows internal signal lines to be connected to vias with high reliability since the area available for connection is greater than with narrow-line entry. In addition, using landless via connections increases the area available in the wiring channel. The optimum via connection is made when the width of the wide-line segment at entry approaches the diameter of the hole since this condition provides a maximum interface for a landless connection between the hole and the line, and minimizes the real estate used. Since the reliability of the interconnection to the via is directly related to the area of the interface, the wide-line entry results in greater reliability and higher manufacturing yields.