1.8-Gb/s High-Speed Multichip Switching Module Using Copper-Polyimide Multilayer Substrate

Naoaki YAMANAKA  Takaaki OHSAKI  Shiro KIKUCHI  Taichi KON  Shinichi SASAKI  

IEICE TRANSACTIONS on Electronics   Vol.E74-C   No.8   pp.2301-2308
Publication Date: 1991/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Advanced Packaging Technology for Microelectronics Manufacturing)
Category: Multi Chip Module

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This paper describes a high-speed multichip (3232 space-division) switching module for high-definition TV broadcasting and switching systems. This newly developed module employs new Si-bipolar SST switching LSIs and a multi-layer substrate with a polyimide dielectric and a fine pattern of copper conductors. This substrate contains matrix-shaped thin film registers for terminated transmission and a spiral via hole structure to increase fabrication reliability. The module has 50 ohm characteristic impedance transmission lines with a deviation of less than 2.5%. The multichip module can handle a signal speed of 1.8 Gb/s using 1 : 1 and 1 : n connections. This technology allows a dramatic reduction in module size to 1/20 of that possible with conventional surface-mounted techniques.