ABSTRACT
As integrated circuits become more inexpensive and compact, many new types of products, such as digital cameras, digital camcorders, and digital television,
are being introduced, based on digital systems. Consequently, logic design must be done under many different motivations. Since each case is different, we have different design problems. For example, we have to choose an appropriate IC (integrated circuit) logic family, since these cases have different performance requirements (scientific computers require high speed, but wristwatches require very low power consumption), although in recent years, CMOS has been more widely used than other IC logic families, such as ECL, which has been used for fast computers.
