Abstract
This chapter discusses the modern digital design methods. It also examines that digital systems are switching devices that operate in only one of two possible states at any given time, but that can be switched back and forth from one state to another at a very high speed. The two states are high voltage (HV) and low voltage (LV). The LV and HV levels are usually taken as 0 V and 2 to 5 V, respectively, for common CMOS logic circuits. To design a useful digital device, meaningful logic names must be assigned to the inputs and outputs of a logic circuit so that their physical interpretation in terms of voltage levels can be made unambiguously. This requires the use of a notation that can easily bridge the gap between the logic domain in which the device is designed, and the physical domain in which the device is to be operated.
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