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Not very long ago the concept of large-scale integration was just thatÂ¿a concept. But since that time most of the more difficult technological problems have been resolved and many others are well on their way to solution. The important potential advantages of LSIÂ¿reduced cost, improved reliability, size and weight reductions, and computerized fabricationÂ¿served to provide the impetus for their rapid development. Focusing on the digital correlator as an example, this article describes the techniques and problems involved both in the basic design and in the fabrication processes.