# Combinational logic circuits

Aug 6th, 2016
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Contains definition of Combinational logic circuits, arithmetic circuits(adder logic circuits, half adder, full adder), Multiplexers and demultiplexers, and finally Encoders and decoders.

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SPH 2433 Sep-Dec 2015SPH 2433 Digital Electronics4.6. Combinational logic circuitsDefinition: A combinational logic circuit is a logic circuit whose output depends only on the present states of theinputs to the circuit.i.e. for a combinational logic circuit, the output is a function of the current input value. Thus,Figure Error! No text of specified style in document.-1: Block diagram representation of a combinational circuit. = ()The previous state of the inputs therefore does not have any effect on the present state of the circuit, i.e. acombinational circuit does not use any memory.A logic gate is the basic building block of a combinational logic circuit.A combinational logic circuit therefore is a combination of various different logic gates.Examples of combinational logic circuits include: Arithmetic circuits (half adders and full adders, half subtractors and full subtractors). Multiplexers and Demultiplexers Encoders and decoders4.6.1. Arithmetic circuitsThey are combinational logic circuits that can be used to perform addition and subtraction operations on binarynumbers.They include adder logic circuits (half-adder and full-adder) and subtractor logic circuits (half-subtractor and fullsubtractor).4.6.1.1.Adder logic circuitsAn adder circuit is a combinational logic circuit that is used for adding binary numbers.Typically, an adder circuit produces a sum bit (d

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