Linear Integrated Circuits

Abstract

The Linear Integrated Circuit (LIC) is, in widest terms, a large number of different circuit elements conveniently encapsulated into a small package to provide an output which is some linear function of the input. This does not preclude the possibility of some circuits realising simple boolean expressions. In theory a complete complex circuit can be reduced in size to one multiterminal component; complex but convenient; simply add a mains supply and switch on. However, in practice, perfection is seldom achieved. Input/output interfaces are required, control of circuit parameters may be necessary, interfaces with other parts of a system, and power output requirements that exceed the potential of the LIC all demand that it is supplemented by discrete components. Designers can seldom afford or achieve complete integration of their circuits into one package, notable exceptions being in the radio receiver industry, where all but the aerial, loudspeaker, tuning and volume controls can be fully integrated.