1-44 SUMMARY This topic has presented information on the development and manufacture of microelectronic devices. The information that follows summarizes the important points of this topic. VACUUM-TUBE CIRCUITSin most modern military equipment are unacceptable because of size, weight, and power use. Discovery of the transistor in 1948 marked the beginning of MICROELECTRONICS. The PRINTED CIRCUIT BOARD(pcb) reduces weight and eliminates point-to-point wiring. The INTEGRATED CIRCUITS(IC) consist of elements inseparably associated and formed on or within a single SUBSTRATE. ICsare classified as three types: MONOLITHIC, FILM, and HYBRID. The MONOLITHIC IC, called a chip or die, contains both active and passive elements.
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