Definition of a digital circuit or digital system

The circuit that performs arithmetic and logical operations on digital quantities with digital signals is called digital circuit, or digital system. Because it has logical operation and logical processing functions, it is also called digital logic circuit. Modern digital circuits are constructed from a number of digital integrated devices made by semiconductor processes. Logic gate is the basic unit of digital logic circuit. Memory is a digital circuit used to store binary data. On the whole, digital circuits can be divided into two categories: combinatorial logic circuits and sequential logic circuits.

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