Semiconductor Circuit Design Philosophy for the Central Control of an Electronic Switching System

The advent of electronic switching has necessitated a considerable number of changes in the circuit design philosophy employed in the electromechanical switching art. The invention of the transistor and the refinement of other semiconductor devices have made possible new techniques. This paper discusses the philosophy of circuit design for the central control of an electronic switching system. Primary emphasis in the designs has been low cost consistent with good margins, reliability and the meeting of systems requirements.